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Why do we check up to the square root of a prime number to determine if it is prime?
...es this might be useful, but this all heavily depends on implementation details (programming language, hardware, data types, libraries), none of which are known in this general consideration.
– Sven Marnach
Aug 3 at 9:38
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Store output of subprocess.Popen call in a string
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In Python 2.7 or Python 3
Instead of making a Popen object directly, you can use the subprocess.check_output() function to store output of a command in a string:
from subprocess import check_output
out = check_output(["ntpq", "-p"])
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How can I create an object and add attributes to it?
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If you need something that works with Python 2.7, you can also try the argparse.Namespace class
– RolKau
Aug 26 '16 at 20:09
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What is the rationale for all comparisons returning false for IEEE754 NaN values?
...logic. If you throw 3-valued logic into the mix, it becomes consistent:
(2.7 == 2.7) = true
(2.7 == 2.6) = false
(2.7 == NaN) = unknown
(NaN == NaN) = unknown
Even .NET does not provide a bool? operator==(double v1, double v2) operator, so you are still stuck with the silly (NaN == NaN) = false ...
Calling a function of a module by using its name (a string)
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@glarrain As long as you're ok with only support 2.7 and up.
– Xiong Chiamiov
Sep 14 '13 at 16:54
1
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Why use argparse rather than optparse?
I noticed that the Python 2.7 documentation includes yet another command-line parsing module. In addition to getopt and optparse we now have argparse .
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Dealing with multiple Python versions and PIP?
...ion}:
$ pip-2.5 install myfoopackage
$ pip-2.6 install otherpackage
$ pip-2.7 install mybarpackage
EDIT: pip changed its schema to use pipVERSION instead of pip-VERSION in version 1.5. You should use the following if you have pip >= 1.5:
$ pip2.6 install otherpackage
$ pip2.7 install mybarp...
How do I install pip on macOS or OS X?
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Installed /Library/Python/2.7/site-packages/pip-6.0.6-py2.7.egg -- what about my python3 installation? Does this just mean that pip uses my python2 installation?
– temporary_user_name
Jan 8 '15 at 22:37
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In Python, how do you convert a `datetime` object to seconds?
...econds. Subtracting two dates gives a timedelta object, which as of Python 2.7 has a total_seconds() function.
>>> (t-datetime.datetime(1970,1,1)).total_seconds()
1256083200.0
The starting date is usually specified in UTC, so for proper results the datetime you feed into this formula sho...
bash: pip: command not found
...lso, there is no /Library/Frameworks/Python.framework/Versions/2.6/ - only 2.7, and the only appeared after I ran the Python 2.7 installer moments ago. Does this mean the default Python 2.6 that comes with Mac doesn't conform to whatever ever standard file locations you assumed?
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