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Add uuids to examples
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README.md
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README.md
vendored
@ -221,7 +221,7 @@ Now, just run `wtfpython` at the command line which will open this collection in
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## Section: Strain your brain!
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### ▶ Strings can be tricky sometimes *
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<!-- Example ID: 30f1d3fc-e267-4b30-84ef-4d9e7091ac1a --!>
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1\.
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```py
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>>> a = "some_string"
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@ -271,7 +271,7 @@ Makes sense, right?
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---
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### ▶ Splitsies ^
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<!-- Example ID: ec3168ba-a81a-4482-afb0-691f1cc8d65a --!>
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```py
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>>> 'a'.split()
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['a']
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@ -308,7 +308,7 @@ Makes sense, right?
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### ▶ Time for some hash brownies!
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<!-- Example ID: eb17db53-49fd-4b61-85d6-345c5ca213ff --!>
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1\.
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```py
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some_dict = {}
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@ -353,7 +353,7 @@ So, why is Python all over the place?
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---
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### ▶ The disorder within order ^
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<!-- Example ID: 91bff1f8-541d-455a-9de4-6cd8ff00ea66 --!>
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```py
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from collections import OrderedDict
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@ -451,7 +451,7 @@ What is going on here?
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---
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### ▶ Keep trying? *
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<!-- Example ID: b4349443-e89f-4d25-a109-82616be9d41a --!>
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```py
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def some_func():
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try:
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@ -511,7 +511,7 @@ Iteration 0
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---
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### ▶ Deep down, we're all the same. *
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<!-- Example ID: 8f99a35f-1736-43e2-920d-3b78ec35da9b --!>
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```py
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class WTF:
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pass
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@ -561,7 +561,7 @@ True
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---
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### ▶ For what?
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<!-- Example ID: 64a9dccf-5083-4bc9-98aa-8aeecde4f210 --!>
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```py
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some_string = "wtf"
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some_dict = {}
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@ -614,7 +614,7 @@ for i, some_dict[i] in enumerate(some_string):
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---
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### ▶ Evaluation time discrepancy ^
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<!-- Example ID: 6aa11a4b-4cf1-467a-b43a-810731517e98 --!>
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1\.
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```py
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array = [1, 8, 15]
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@ -680,7 +680,7 @@ array_4 = [400, 500, 600]
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---
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### ▶ Messing around with `is` operator^
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<!-- Example ID: 230fa2ac-ab36-4ad1-b675-5f5a1c1a6217 --!>
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The following is a very famous example present all over the internet.
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1\.
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@ -798,7 +798,7 @@ Similar optimization applies to other **immutable** objects like empty tuples as
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---
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### ▶ A tic-tac-toe where X wins in the first attempt!
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<!-- Example ID: 69329249-bdcb-424f-bd09-cca2e6705a7a --!>
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```py
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# Let's initialize a row
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row = [""]*3 #row i['', '', '']
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@ -843,7 +843,7 @@ We can avoid this scenario here by not using `row` variable to generate `board`.
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---
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### ▶ The sticky output function
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<!-- Example ID: 4dc42f77-94cb-4eb5-a120-8203d3ed7604 --!>
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```py
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funcs = []
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results = []
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@ -897,7 +897,7 @@ Even when the values of `x` were different in every iteration prior to appending
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---
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### ▶ The chicken-egg problem ^
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<!-- Example ID: 60730dc2-0d79-4416-8568-2a63323b3ce8 --!>
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1\.
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```py
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>>> isinstance(3, int)
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@ -945,7 +945,7 @@ False
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---
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### ▶ `is not ...` is not `is (not ...)`
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<!-- Example ID: b26fb1ed-0c7d-4b9c-8c6d-94a58a055c0d --!>
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```py
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>>> 'something' is not None
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True
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@ -961,7 +961,7 @@ False
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---
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### ▶ The surprising comma
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<!-- Example ID: 31a819c8-ed73-4dcc-84eb-91bedbb51e58 --!>
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**Output:**
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```py
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>>> def f(x, y,):
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@ -991,7 +991,7 @@ SyntaxError: invalid syntax
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---
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### ▶ Strings and the backslashes\ ^
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<!-- Example ID: 6ae622c3-6d99-4041-9b33-507bd1a4407b --!>
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**Output:**
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```py
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>>> print("\"")
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@ -1034,7 +1034,7 @@ True
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---
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### ▶ not knot!
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<!-- Example ID: 7034deb1-7443-417d-94ee-29a800524de8 --!>
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```py
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x = True
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y = False
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@ -1061,7 +1061,7 @@ SyntaxError: invalid syntax
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---
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### ▶ Half triple-quoted strings
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<!-- Example ID: c55da3e2-1034-43b9-abeb-a7a970a2ad9e --!>
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**Output:**
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```py
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>>> print('wtfpython''')
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@ -1086,7 +1086,7 @@ wtfpython
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---
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### ▶ Midnight time doesn't exist?
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<!-- Example ID: 1bce8294-5619-4d70-8ce3-fe0bade690d1 --!>
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```py
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from datetime import datetime
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@ -1116,7 +1116,7 @@ Before Python 3.5, the boolean value for `datetime.time` object was considered t
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---
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### ▶ What's wrong with booleans?
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<!-- Example ID: 0bba5fa7-9e6d-4cd2-8b94-952d061af5dd --!>
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1\.
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```py
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# A simple example to count the number of booleans and
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@ -1181,7 +1181,7 @@ for item in mixed_list:
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---
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### ▶ Class attributes and instance attributes
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<!-- Example ID: 6f332208-33bd-482d-8106-42863b739ed9 --!>
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1\.
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```py
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class A:
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@ -1251,7 +1251,7 @@ True
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---
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### ▶ yielding None
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<!-- Example ID: 5a40c241-2c30-40d0-8ba9-cf7e097b3b53 --!>
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```py
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some_iterable = ('a', 'b')
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@ -1280,7 +1280,7 @@ def some_func(val):
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---
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### ▶ Mutating the immutable!
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<!-- Example ID: 15a9e782-1695-43ea-817a-a9208f6bb33d --!>
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```py
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some_tuple = ("A", "tuple", "with", "values")
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another_tuple = ([1, 2], [3, 4], [5, 6])
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@ -1313,7 +1313,7 @@ But I thought tuples were immutable...
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---
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### ▶ The disappearing variable from outer scope
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<!-- Example ID: 7f1e71b6-cb3e-44fb-aa47-87ef1b7decc8 --!>
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```py
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e = 7
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try:
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@ -1393,7 +1393,7 @@ NameError: name 'e' is not defined
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---
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### ▶ When True is actually False
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<!-- Example ID: c8317047-48ae-4306-af5a-04c6d8b7c2b9 --!>
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```py
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True = False
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if True == False:
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@ -1413,7 +1413,7 @@ I've lost faith in truth!
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---
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### ▶ Lossy zip of iterators
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<!-- Example ID: c28ed154-e59f-4070-8eb6-8967a4acac6d --!>
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```py
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>>> numbers = list(range(7))
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>>> numbers
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@ -1462,7 +1462,7 @@ Where did element `3` go from the `numbers` list?
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---
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### ▶ From filled to None in one instruction...
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<!-- Example ID: 9a0d5335-efe5-4eae-af44-584d15233066 --!>
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```py
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some_list = [1, 2, 3]
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some_dict = {
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@ -1490,7 +1490,7 @@ Most methods that modify the items of sequence/mapping objects like `list.append
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---
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### ▶ Subclass relationships *
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<!-- Example ID: 9f6d8cf0-e1b5-42d0-84a0-4cfab25a0bc0 --!>
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**Output:**
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```py
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>>> from collections import Hashable
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@ -1514,7 +1514,7 @@ The Subclass relationships were expected to be transitive, right? (i.e., if `A`
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---
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### ▶ The mysterious key type conversion *
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<!-- Example ID: 00f42dd0-b9ef-408d-9e39-1bc209ce3f36 --!>
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```py
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class SomeClass(str):
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pass
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@ -1570,7 +1570,7 @@ str
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---
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### ▶ Let's see if you can guess this?
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<!-- Example ID: 81aa9fbe-bd63-4283-b56d-6fdd14c9105e --!>
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```py
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a, b = a[b] = {}, 5
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```
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@ -1631,7 +1631,7 @@ a, b = a[b] = {}, 5
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## Section: Appearances are deceptive!
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### ▶ Skipping lines?
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<!-- Example ID: d50bbde1-fb9d-4735-9633-3444b9d2f417 --!>
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**Output:**
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```py
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>>> value = 11
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@ -1667,7 +1667,7 @@ The built-in `ord()` function returns a character's Unicode [code point](https:/
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---
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### ▶ Teleportation *
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<!-- Example ID: edafe923-0c20-4315-b6e1-0c31abfc38f5 --!>
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```py
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import numpy as np
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@ -1697,7 +1697,7 @@ Where's the Nobel Prize?
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---
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### ▶ Well, something is fishy...
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<!-- Example ID: cb6a37c5-74f7-44ca-b58c-3b902419b362 --!>
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```py
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def square(x):
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"""
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@ -1742,7 +1742,7 @@ Shouldn't that be 100?
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### ▶ Modifying a dictionary while iterating over it
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<!-- Example ID: b4e5cdfb-c3a8-4112-bd38-e2356d801c41 --!>
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```py
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x = {0: None}
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@ -1777,7 +1777,7 @@ Yes, it runs for exactly **eight** times and stops.
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---
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### ▶ Stubborn `del` operation *
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<!-- Example ID: 777ed4fd-3a2d-466f-95e7-c4058e61d78e --!>
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```py
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class SomeClass:
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def __del__(self):
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@ -1820,7 +1820,7 @@ Okay, now it's deleted :confused:
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---
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### ▶ Deleting a list item while iterating
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<!-- Example ID: 4cc52d4e-d42b-4e09-b25f-fbf5699b7d4e --!>
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```py
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list_1 = [1, 2, 3, 4]
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list_2 = [1, 2, 3, 4]
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@ -1880,7 +1880,7 @@ Can you guess why the output is `[2, 4]`?
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---
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### ▶ Loop variables leaking out!
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<!-- Example ID: ccec7bf6-7679-4963-907a-1cd8587be9ea --!>
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1\.
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```py
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for x in range(7):
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@ -1944,7 +1944,7 @@ print(x, ': x in global')
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---
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### ▶ Beware of default mutable arguments!
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<!-- Example ID: 7d42dade-e20d-4a7b-9ed7-16fb58505fe9 --!>
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```py
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def some_func(default_arg=[]):
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default_arg.append("some_string")
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@ -2001,7 +2001,7 @@ def some_func(default_arg=[]):
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---
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### ▶ Catching the Exceptions
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<!-- Example ID: b5ca5e6a-47b9-4f69-9375-cda0f8c6755d --!>
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```py
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some_list = [1, 2, 3]
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try:
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@ -2076,7 +2076,7 @@ SyntaxError: invalid syntax
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---
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### ▶ Same operands, different story!
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<!-- Example ID: ca052cdf-dd2d-4105-b936-65c28adc18a0 --!>
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1\.
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```py
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a = [1, 2, 3, 4]
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@ -2118,7 +2118,7 @@ a += [5, 6, 7, 8]
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---
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### ▶ The out of scope variable
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<!-- Example ID: 75c03015-7be9-4289-9e22-4f5fdda056f7 --!>
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```py
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a = 1
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def some_func():
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@ -2157,7 +2157,7 @@ UnboundLocalError: local variable 'a' referenced before assignment
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---
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### ▶ Be careful with chained operations
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<!-- Example ID: 07974979-9c86-4720-80bd-467aa19470d9 --!>
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```py
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>>> (False == False) in [False] # makes sense
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False
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@ -2202,7 +2202,7 @@ While such behavior might seem silly to you in the above examples, it's fantasti
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---
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### ▶ Name resolution ignoring class scope
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<!-- Example ID: 03f73d96-151c-4929-b0a8-f74430788324 --!>
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1\.
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```py
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x = 5
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@ -2246,7 +2246,7 @@ class SomeClass:
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---
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### ▶ Needles in a Haystack ^
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<!-- Example ID: 52a199b1-989a-4b28-8910-dff562cebba9 --!>
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1\.
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```py
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x, y = (0, 1) if True else None, None
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@ -2351,7 +2351,7 @@ b = "javascript"
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---
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### ▶ Wild imports
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<!-- Example ID: 83deb561-bd55-4461-bb5e-77dd7f411e1c --!>
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```py
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# File: module.py
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@ -2413,7 +2413,7 @@ NameError: name 'some_weird_name_func_' is not defined
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This section contains few of the lesser-known interesting things about Python that most beginners like me are unaware of (well, not anymore).
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### ▶ Okay Python, Can you make me fly? *
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<!-- Example ID: a92f3645-1899-4d50-9721-0031be4aec3f --!>
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Well, here you go
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```py
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@ -2431,7 +2431,7 @@ Sshh.. It's a super secret.
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---
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### ▶ `goto`, but why? *
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<!-- Example ID: 2aff961e-7fa5-4986-a18a-9e5894bd89fe --!>
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```py
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from goto import goto, label
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for i in range(9):
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@ -2459,7 +2459,7 @@ Freedom!
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---
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### ▶ Brace yourself! *
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<!-- Example ID: 5c0c75f2-ddd9-4da3-ba49-c4be7ec39acf --!>
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If you are one of the people who doesn't like using whitespace in Python to denote scopes, you can use the C-style {} by importing,
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```py
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@ -2484,7 +2484,7 @@ Braces? No way! If you think that's disappointing, use Java. Okay, another surpr
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---
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### ▶ Let's meet Friendly Language Uncle For Life ^
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<!-- Example ID: 6427fae6-e959-462d-85da-ce4c94ce41be --!>
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**Output (Python 3.x)**
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```py
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>>> from __future__ import barry_as_FLUFL
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@ -2515,7 +2515,7 @@ There we go.
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---
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### ▶ Even Python understands that love is complicated *
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<!-- Example ID: b93cad9e-d341-45d1-999c-fcdce65bed25 --!>
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```py
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import this
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```
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@ -2572,7 +2572,7 @@ True
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---
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### ▶ Yes, it exists!
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<!-- Example ID: 4286db3d-1ea7-47c9-8fb6-a9a04cac6e49 --!>
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**The `else` clause for loops.** One typical example might be:
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```py
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@ -2616,7 +2616,7 @@ Try block executed successfully...
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---
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### ▶ Ellipsis ^
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<!-- Example ID: 969b7100-ab3d-4a7d-ad7d-a6be16181b2b --!>
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```py
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def some_func():
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Ellipsis
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@ -2676,7 +2676,7 @@ Ellipsis
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---
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### ▶ Inpinity *
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<!-- Example ID: ff473ea8-a3b1-4876-a6f0-4378aff790c1 --!>
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The spelling is intended. Please, don't submit a patch for this.
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**Output (Python 3.x):**
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@ -2695,7 +2695,7 @@ The spelling is intended. Please, don't submit a patch for this.
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---
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### ▶ Let's mangle ^
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<!-- Example ID: 37146d2d-9e67-43a9-8729-3c17934b910c --!>
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1\.
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||||
```py
|
||||
class Yo(object):
|
||||
@ -2783,7 +2783,7 @@ AttributeError: 'A' object has no attribute '__variable'
|
||||
|
||||
|
||||
### ▶ `+=` is faster
|
||||
|
||||
<!-- Example ID: bfd19c60-a807-4a26-9598-4912b86ddb36 --!>
|
||||
```py
|
||||
# using "+", three strings:
|
||||
>>> timeit.timeit("s1 = s1 + s2 + s3", setup="s1 = ' ' * 100000; s2 = ' ' * 100000; s3 = ' ' * 100000", number=100)
|
||||
@ -2799,7 +2799,7 @@ AttributeError: 'A' object has no attribute '__variable'
|
||||
---
|
||||
|
||||
### ▶ Let's make a giant string!
|
||||
|
||||
<!-- Example ID: c7a07424-63fe-4504-9842-8f3d334f28fc --!>
|
||||
```py
|
||||
def add_string_with_plus(iters):
|
||||
s = ""
|
||||
@ -2892,7 +2892,7 @@ Let's increase the number of iterations by a factor of 10.
|
||||
---
|
||||
|
||||
### ▶ Explicit typecast of strings
|
||||
|
||||
<!-- Example ID: 59bee91a-36e0-47a4-8c7d-aa89bf1d3976 --!>
|
||||
```py
|
||||
a = float('inf')
|
||||
b = float('nan')
|
||||
@ -2931,7 +2931,7 @@ nan
|
||||
---
|
||||
|
||||
### ▶ Minor Ones
|
||||
|
||||
<!-- Example ID: f885cb82-f1e4-4daa-9ff3-972b14cb1324 --!>
|
||||
* `join()` is a string operation instead of list operation. (sort of counter-intuitive at first usage)
|
||||
|
||||
**💡 Explanation:**
|
||||
|
Loading…
x
Reference in New Issue
Block a user