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bpo-39971: Change examples to be runnable (GH-32172)

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(cherry picked from commit c57a1c76d7)

Co-authored-by: Stanley <46876382+slateny@users.noreply.github.com>
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Miss Islington (bot) 2022-06-25 13:59:43 -07:00 • committed by GitHub
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1 changed files with 18 additions and 11 deletions
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29
Doc/howto/functional.rst
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@ -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 Sets can take their contents from an iterable and let you iterate over the set's
elements:: elements::
S = {2, 3, 5, 7, 11, 13} >>> S = {2, 3, 5, 7, 11, 13}
for i in S: >>> for i in S:
print(i) ... 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 functional programming language Haskell (https://www.haskell.org/). You can strip
all the whitespace from a stream of strings with the following code:: 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 >>> # Generator expression -- returns iterator
stripped_iter = (line.strip() for line in line_list) >>> stripped_iter = (line.strip() for line in line_list)
# List comprehension -- returns list >>> # List comprehension -- returns list
stripped_list = [line.strip() for line in line_list] >>> stripped_list = [line.strip() for line in line_list]
You can select only certain elements by adding an ``"if"`` condition:: You can select only certain elements by adding an ``"if"`` condition::
stripped_list = [line.strip() for line in line_list >>> stripped_list = [line.strip() for line in line_list
if line != ""] ... if line != ""]
With a list comprehension, you get back a Python list; ``stripped_list`` is a With a list comprehension, you get back a Python list; ``stripped_list`` is a
list containing the resulting lines, not an iterator. Generator expressions list containing the resulting lines, not an iterator. Generator expressions
@ -363,7 +369,8 @@ have the form::
if condition1 if condition1
for expr2 in sequence2 for expr2 in sequence2
if condition2 if condition2
for expr3 in sequence3 ... for expr3 in sequence3
...
if condition3 if condition3
for exprN in sequenceN for exprN in sequenceN
if conditionN ) if conditionN )