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How do I get time of a Python program's execution?
I have a command line program in Python that takes a while to finish. I want to know the exact time it takes to finish running.
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UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 13: ordinal not in range(128)
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The file is being read as a bunch of strs, but it should be unicodes. Python tries to implicitly convert, but fails. Change:
job_titles = [line.strip() for line in title_file.readlines()]
to explicitly decode the strs to unicode (here assuming UTF-8):
job_titles = [line.decode('utf-8').stri...
Reading a huge .csv file
I'm currently trying to read data from .csv files in Python 2.7 with up to 1 million rows, and 200 columns (files range from 100mb to 1.6gb). I can do this (very slowly) for the files with under 300,000 rows, but once I go above that I get memory errors. My code looks like this:
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Python data structure sort list alphabetically
I am a bit confused regarding data structure in python; () , [] , and {} . I am trying to sort a simple list, probably since I cannot identify the type of data I am failing to sort it.
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Numpy `logical_or` for more than two arguments
...erms, and can be used as a 2D array.
Outside of NumPy, you can also use Python's reduce:
>>> functools.reduce(np.logical_or, (x, y, z))
array([ True, True, True, False], dtype=bool)
However, unlike NumPy's reduce, Python's is not often needed. For most cases, there's a simpler way ...
Python dictionary: are keys() and values() always the same order?
.... I can only assume it's because "Dict keeps insertion order" in 3.7: mail.python.org/pipermail/python-dev/2017-December/151283.html
– EliadL
Jan 23 '19 at 16:40
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Remove characters except digits from string using Python?
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In Python 2.*, by far the fastest approach is the .translate method:
>>> x='aaa12333bb445bb54b5b52'
>>> import string
>>> all=string.maketrans('','')
>>> nodigs=all.translate(all, string.digi...
How to check Django version
I have to use Python and Django for our application. So I have two versions of Python, 2.6 and 2.7. Now I have installed Django. I could run the sample application for testing Django succesfuly. But how do I make sure whether Django uses the 2.6 or 2.7 version and what version of modules Django ...
adding noise to a signal in python
...nt to add some random noise to some 100 bin signal that I am simulating in Python - to make it more realistic.
7 Answers
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Iterate over the lines of a string
...* 100 for foo to get substantial strings for more precise measurement):
$ python -mtimeit -s'import asp' 'list(asp.f3())'
1000 loops, best of 3: 370 usec per loop
$ python -mtimeit -s'import asp' 'list(asp.f2())'
1000 loops, best of 3: 1.36 msec per loop
$ python -mtimeit -s'import asp' 'list(asp.f...