From f8acf49d0544108684d3fa66337e14a11bf9c6f1 Mon Sep 17 00:00:00 2001 From: Satwik Kansal Date: Wed, 9 Oct 2019 18:48:41 +0530 Subject: [PATCH] Update README.md --- README.md | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-) diff --git a/README.md b/README.md index 27940e5..c31017e 100644 --- a/README.md +++ b/README.md @@ -2368,23 +2368,21 @@ nan + `++a` parses as `+(+a)` which translates to `a`. Similarly, the output of the statement `--a` can be justified. + This StackOverflow [thread](https://stackoverflow.com/questions/3654830/why-are-there-no-and-operators-in-python) discusses the rationale behind the absence of increment and decrement operators in Python. -* There is a lack of incrementation operator known from different languages, but have you ever heard about _the space-invader operator_? +* Have you ever heard about _the space-invader operator_ in Python? ```py >>> a = 42 >>> a -=- 1 >>> a 43 ``` - - + together with another: - ```py - >>> a +=+ 1 - >>> a - >>> 44 - ``` - + It is used as an alternative incrementation operator, together with another one + ```py + >>> a +=+ 1 + >>> a + >>> 44 + ``` **💡 Explanation:** - This prank comes from [Raymond Hettinger's twit](https://twitter.com/raymondh/status/1131103570856632321?lang=en) and it is actually just malformatted `a -= (-1)`. Which is eqivalent to `a = a - (- 1)`. Similar for the `a += (+ 1)` case. + This prank comes from [Raymond Hettinger's tweet](https://twitter.com/raymondh/status/1131103570856632321?lang=en). The space invader operator is actually just a malformatted `a -= (-1)`. Which is eqivalent to `a = a - (- 1)`. Similar for the `a += (+ 1)` case. * Python uses 2 bytes for local variable storage in functions. In theory, this means that only 65536 variables can be defined in a function. However, python has a handy solution built in that can be used to store more than 2^16 variable names. The following code demonstrates what happens in the stack when more than 65536 local variables are defined (Warning: This code prints around 2^18 lines of text, so be prepared!): ```py