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if/else in a list comprehension
... first list comprehension for X_non_str, the order is:
expression for item in iterable if condition
and in the last list comprehension for X_str_changed, the order is:
expression1 if condition else expression2 for item in iterable
I always find it hard to remember that expression1 ha...
Transpose/Unzip Function (inverse of zip)?
I have a list of 2-item tuples and I'd like to convert them to 2 lists where the first contains the first item in each tuple and the second list holds the second item.
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Django filter queryset __in for *every* item in list
Let's say I have the following models
6 Answers
6
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Explanation of the UML arrows
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Nice reference but to me a Menu -> MenuItem has the same relation like a Order -> OrderItem so both of them are Compositions.
– Ignacio Soler Garcia
Jun 28 '13 at 10:53
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Loop inside React JSX
...ode like this.props.order.map((k)=><ObjectRow key={k} {...this.props.items[k]} />)
– tgrrr
Mar 15 '16 at 8:04
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Closing multiple issues in Github with a commit message
...es by putting closes #1 or fixes #1 in the commit message. What is the best way to close multiple issues in the same commit message?
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How to enumerate an object's properties in Python?
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this answer is the best when doing scratch work on the cli.
– user1427008
Jul 21 '18 at 3:03
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Automatically open Chrome developer tools when new tab/new window is opened
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The best answer IMO
– Chase Miller
Aug 29 '18 at 20:38
2
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Create a “with” block on several context managers? [duplicate]
...th A() as X, B() as Y, C() as Z:
do_something()
This is normally the best method to use, but if you have an unknown-length list of context managers you'll need one of the below methods.
In Python 3.3, you can enter an unknown-length list of context managers by using contextlib.ExitStack:
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os.walk without digging into directories below
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Don't use os.walk.
Example:
import os
root = "C:\\"
for item in os.listdir(root):
if os.path.isfile(os.path.join(root, item)):
print item
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