大约有 40,000 项符合查询结果（耗时：0.0301秒） [XML]
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.al
... the two arrays to be evaluated in boolean context (by
calling __bool__ in Python3 or __nonzero__ in Python2).
Your original code
mask = ((r["dt"] >= startdate) & (r["dt"] <= enddate))
selected = r[mask]
looks correct. However, if you do want and, then instead of a and b use (a-b).any...
TypeError: sequence item 0: expected string, int found
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No longer an issue in Python3, str('\xeb') => ë
– Brayoni
Apr 30 at 7:18
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Python multiprocessing pool.map for multiple arguments
...le arguments?
Python 3.3 includes pool.starmap() method:
#!/usr/bin/env python3
from functools import partial
from itertools import repeat
from multiprocessing import Pool, freeze_support
def func(a, b):
return a + b
def main():
a_args = [1,2,3]
second_arg = 1
with Pool() as poo...
Python threading.timer - repeat function every 'n' seconds
... but I struggled to understand how it was designed from simply reading the Python3 threading Timer interface documentation. The answer appears to build on knowing the implementation by going into the threading.py module itself.
– Adam.at.Epsilon
Jun 15 at 8:40
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Detect if homebrew package is installed
...th some versioned formula like python@3 which is installed (and listed) as python3.
– Daniele Orlando
Jan 18 '18 at 19:57
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Using module 'subprocess' with timeout
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Since Python3.5, use subprocess.run() with capture_output=True and use the encoding parameter to get usefoul output.
– MKesper
May 28 at 9:33
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Python - Get path of root project structure
...tory that contains the script that was executed. For example, when running python3 -m topmodule.submodule.script it will give /path/to/topmodule/submodule instead of /path/to/topmodule.
– danijar
Mar 31 '19 at 18:18
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How do I lowercase a string in Python?
...is not only unnecessary in Python 3, but causes an error. (ref). Example: $python3; >>>s='Километр'; >>>print (s.lower); #result: километр >>>s.decode('utf-8').lower(); #result: ...AttributeError: 'str' object has no attribute 'decode' We can se...
Convert timedelta to total seconds
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datetime.timedelta.total_seconds(time2-time1) in Python3.6
– Russo
May 23 '18 at 16:05
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How can I implement a tree in Python?
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The question is tagged with Python3, there's no need to derive class Tree from object then
– cfi
Apr 26 '12 at 16:32
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