From 83d8d8ece9cafd352cc96d6ec33ec893b61c6277 Mon Sep 17 00:00:00 2001
From: Stanley <46876382+slateny@users.noreply.github.com>
Date: Sat, 25 Jun 2022 13:51:26 -0700
Subject: [PATCH] bpo-39971: Change examples to be runnable (GH-32172) (cherry
picked from commit c57a1c76d71075b14f6524b4681f29a3f1e88cb2)
Co-authored-by: Stanley <46876382+slateny@users.noreply.github.com>
---
Doc/howto/functional.rst | 29 ++++++++++++++++++-----------
1 file changed, 18 insertions(+), 11 deletions(-)
diff --git a/Doc/howto/functional.rst b/Doc/howto/functional.rst
index 695b9b31a762bd..fb561a6a10b661 100644
--- a/Doc/howto/functional.rst
+++ b/Doc/howto/functional.rst
@@ -315,9 +315,15 @@ line of a file like this::
Sets can take their contents from an iterable and let you iterate over the set's
elements::
- S = {2, 3, 5, 7, 11, 13}
- for i in S:
- print(i)
+ >>> S = {2, 3, 5, 7, 11, 13}
+ >>> for i in S:
+ ... print(i)
+ 2
+ 3
+ 5
+ 7
+ 11
+ 13
@@ -335,18 +341,18 @@ List comprehensions and generator expressions (short form: "listcomps" and
functional programming language Haskell (https://www.haskell.org/). You can strip
all the whitespace from a stream of strings with the following code::
- line_list = [' line 1\n', 'line 2 \n', ...]
+ >>> line_list = [' line 1\n', 'line 2 \n', ' \n', '']
- # Generator expression -- returns iterator
- stripped_iter = (line.strip() for line in line_list)
+ >>> # Generator expression -- returns iterator
+ >>> stripped_iter = (line.strip() for line in line_list)
- # List comprehension -- returns list
- stripped_list = [line.strip() for line in line_list]
+ >>> # List comprehension -- returns list
+ >>> stripped_list = [line.strip() for line in line_list]
You can select only certain elements by adding an ``"if"`` condition::
- stripped_list = [line.strip() for line in line_list
- if line != ""]
+ >>> stripped_list = [line.strip() for line in line_list
+ ... if line != ""]
With a list comprehension, you get back a Python list; ``stripped_list`` is a
list containing the resulting lines, not an iterator. Generator expressions
@@ -363,7 +369,8 @@ have the form::
if condition1
for expr2 in sequence2
if condition2
- for expr3 in sequence3 ...
+ for expr3 in sequence3
+ ...
if condition3
for exprN in sequenceN
if conditionN )
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