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Efficient way to remove keys with empty strings from a dict
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Python 2.X
dict((k, v) for k, v in metadata.iteritems() if v)
Python 2.7 - 3.X
{k: v for k, v in metadata.items() if v is not None}
Note that all of your keys have values. It's just that some of those values are the empty string. There's no such thing as a key in a dict without a value; i...
ValueError: numpy.dtype has the wrong size, try recompiling
I just installed pandas and statsmodels package on my python 2.7
When I tried "import pandas as pd", this error message comes out.
Can anyone help? Thanks!!!
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error: Unable to find vcvarsall.bat
...s installations:
While running setup.py for package installations, Python 2.7 searches for an installed Visual Studio 2008. You can trick Python to use a newer Visual Studio by setting the correct path in VS90COMNTOOLS environment variable before calling setup.py.
Execute the following command bas...
AI2 Keep Awake
...r the CPU to be constantly active. Instead, an alarm can be used (see UrsAI2Alarm ). Motivation For some projects it is necessary to prevent the associated app from being deactivated by the operating system. A typical example would be that sensor data should be sent regularly to an MQTT bro...
搭建高可用mongodb集群（二）—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...
...conds
Sun Dec 29 22:03:05.499 [rsHealthPoll] DBClientCursor::init call() failed
Sun Dec 29 22:03:05.499 [rsHealthPoll] replset info 192.168.1.138:27017 heartbeat failed, retrying
Sun Dec 29 22:03:05.501 [rsHealthPoll] replSet info 192.168.1.138:27017 is down (or slow to respond):
Sun Dec 29 22:0...
Python: avoid new line with print command [duplicate]
...thon 3? I'm asking, because print will require parens, and with parens and 2.7, this won't work.
– octopusgrabbus
Jun 29 '12 at 17:13
46
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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 ...