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When splitting an empty string in Python, why does split() return an empty list while split('\n') re
... gives two pieces. Making two cuts, gives three pieces.
And so it is with Python's str.split(delimiter) method:
>>> ''.split(',') # No cuts
['']
>>> ','.split(',') # One cut
['', '']
>>> ',,'.split(',') # Two cuts
['', '', '']
Question: And is there ...
Shell command to sum integers, one per line?
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The one-liner version in Python:
$ python -c "import sys; print(sum(int(l) for l in sys.stdin))"
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Reading a UTF8 CSV file with Python
I am trying to read a CSV file with accented characters with Python (only French and/or Spanish characters). Based on the Python 2.5 documentation for the csvreader ( http://docs.python.org/library/csv.html ), I came up with the following code to read the CSV file since the csvreader supports only A...
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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What are good uses for Python3's “Function Annotations”
...tions/postconditions.
I feel something like this is especially needed in Python because of its weaker typing, but there were really no constructs that made this straightforward and part of the official syntax.
There are other uses for annotations beyond assurance. I can see how I could apply my ...
How do you set your pythonpath in an already-created virtualenv?
...DIT #2
The right answer is @arogachev's one.
If you want to change the PYTHONPATH used in a virtualenv, you can add the following line to your virtualenv's bin/activate file:
export PYTHONPATH="/the/path/you/want"
This way, the new PYTHONPATH will be set each time you use this virtualenv.
ED...
How can I check if my python object is a number? [duplicate]
...However, in many cases you shouldn't worry about checking types manually - Python is duck typed and mixing somewhat compatible types usually works, yet it will barf an error message when some operation doesn't make sense (4 - "1"), so manually checking this is rarely really needed. It's just a bonus...
“/usr/bin/ld: cannot find -lz”
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Also helped me install/build lxml-3.4.0 for Python via pip on Ubuntu 14.04 LTS/trusty. Thanks!
– Marian
Sep 15 '14 at 8:07
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How to enumerate an object's properties in Python?
...? in Javascript you could do: object[property] = newValue. How to do it in Python?
– Jader Dias
Aug 9 '09 at 18:32
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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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