大约有 9,000 项符合查询结果（耗时：0.0288秒） [XML]
Extract every nth element of a vector
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I hate to compare Python with R, but how great could PyRon be? a = 1:120; b = [::6]. Python can't do the former, R not the latter.
– bers
Jul 29 at 10:56
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How to test if a dictionary contains a specific key? [duplicate]
...x
and a quick search reveals some nice information about it: http://docs.python.org/3/tutorial/datastructures.html#dictionaries
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Test a string for a substring [duplicate]
Is there an easy way to test a Python string "xxxxABCDyyyy" to see if "ABCD" is contained within it?
2 Answers
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How to convert list to string [duplicate]
How can I convert a list to a string using Python?
3 Answers
3
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Where are the Assertion Methods list from Django TestCase? [closed]
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It just uses the standard python unittest, http://docs.python.org/library/unittest.html#assert-methods, extended with Django-specific asserts which can be found here.
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List all virtualenv
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If you are using virtualenv or Python 3's built in venv the above answers might not work.
If you are on Linux, just locate the activate script that is always present inside a env.
locate -b '\activate' | grep "/home"
This will grab all Python virtual envi...
How to stop Flask from initialising twice in Debug Mode? [duplicate]
When building a Flask service in Python and setting the debug mode on, the Flask service will initialise twice. When the initialisation loads caches and the like, this can take a while. Having to do this twice is annoying when in development (debug) mode. When debug is off, the Flask service only in...
Local (?) variable referenced before assignment [duplicate]
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Automatically creating directories with file output [duplicate]
...d the os.makedirs calls, so that to protect us from race conditions.
In Python 3.2+, there is a more elegant way that avoids the race condition above:
import os
filename = "/foo/bar/baz.txt"
os.makedirs(os.path.dirname(filename), exist_ok=True)
with open(filename, "w") as f:
f.write("FOOBAR...
How to convert a date string to different format [duplicate]
I need to convert date string "2013-1-25" to string "1/25/13" in python.
I looked at the datetime.strptime but still can't find a way for this.
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