docs/wtfpython
docs/wtfpython
1
0
Fork 0
mirror of https://github.com/satwikkansal/wtfpython synced 2024-11-22 11:04:25 +01:00
Code Releases Activity

Update immutable tuples example

Browse Source
This commit is contained in:
Satwik Kansal 2017-08-30 12:44:41 +05:30
parent e00b13005c
commit 79a7f8a6d7
1 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
README.md
View File

@ -409,15 +409,21 @@ TypeError: 'tuple' object does not support item assignment
>>> another_tuple[2].append(1000) #This throws no error >>> another_tuple[2].append(1000) #This throws no error
>>> another_tuple >>> another_tuple
([1, 2], [3, 4], [5, 6, 1000]) ([1, 2], [3, 4], [5, 6, 1000])
>>> another_tuple[2] += [99, 999]
TypeError: 'tuple' object does not support item assignment
>>> another_tuple
([1, 2], [3, 4], [5, 6, 1000, 99, 999])
``` ```
### Explanation ### Explanation
Quoting from https://docs.python.org/2/reference/datamodel.html * Quoting from https://docs.python.org/2/reference/datamodel.html
> Immutable sequences > Immutable sequences
An object of an immutable sequence type cannot change once it is created. (If the object contains references to other objects, these other objects may be mutable and may be changed; however, the collection of objects directly referenced by an immutable object cannot change.) An object of an immutable sequence type cannot change once it is created. (If the object contains references to other objects, these other objects may be mutable and may be changed; however, the collection of objects directly referenced by an immutable object cannot change.)
* `+=` operator changes the list in-place. The item assignment doesn't work, but when the exception occurs, the item has already been changed in place.
## Using a varibale not defined in scope ## Using a varibale not defined in scope
```py ```py
@ -995,7 +1001,7 @@ ValueError: list.remove(x): x not in list
**Output (Python 3.x):** **Output (Python 3.x):**
```py ```py
File "<ipython-input-1-67dfe27418d8>", line 3 File "<input>", line 3
except IndexError, ValueError: except IndexError, ValueError:
^ ^
SyntaxError: invalid syntax SyntaxError: invalid syntax
@ -1020,7 +1026,7 @@ SyntaxError: invalid syntax
``` ```
**Output (Python 3.x):** **Output (Python 3.x):**
```py ```py
File "<ipython-input-2-9de83846b87f>", line 4 File "<input>", line 4
except (IndexError, ValueError), e: except (IndexError, ValueError), e:
^ ^
IndentationError: unindent does not match any outer indentation level IndentationError: unindent does not match any outer indentation level