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Python 2.7: Print to File
... I get AttributeError: 'str' object has no attribute 'write' with your python3 syntax
– Suncatcher
Jul 28 '17 at 18:01
5
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How to mock an import
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@LucasCimon, replace __builtin__ by builtins for python3 (docs.python.org/3/whatsnew/3.0.html?highlight=__builtin__)
– Luke Marlin
Jul 8 '19 at 8:53
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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...
How to colorize diff on the command line?
...e-by-side word level diff
https://github.com/ymattw/ydiff
Is this Nirvana?
python3 -m pip install --user ydiff
diff -u a b | ydiff -s
Outcome:
If the lines are too narrow (default 80 columns), fit to screen with:
diff -u a b | ydiff -w 0 -s
Contents of the test files:
a
1
2
3
4
5 the original lin...
How to use filter, map, and reduce in Python 3
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Since the reduce method has been removed from the built in function from Python3, don't forget to import the functools in your code. Please look at the code snippet below.
import functools
my_list = [10,15,20,25,35]
sum_numbers = functools.reduce(lambda x ,y : x+y , my_list)
print(sum_numbers)
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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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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
add a comment
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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...
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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