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Skipping Iterations in Python
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The real question: Is leavin out the 'g' in 'lookin' Pythonic?
– Mason Gardner
Jan 12 '17 at 18:22
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Copy to clipboard in Node.js?
...e of node-copy-paste, it calls out to pbcopy/pbpaste (for OSX), xclip (for linux), and clip (for windows).
This module was very helpful when I was doing a lot of work in the REPL for a side project. Needless to say, copy-paste is only a command line utility -- it is not meant for server work.
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How to count the frequency of the elements in an unordered list?
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The python groupby creates new groups when the value it sees changes. In this case 1,1,1,2,1,1,1] would return [3,1,3]. If you expected [6,1] then just be sure to sort the data before using groupby.
– Evan
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How to print a linebreak in a python function?
I have a list of strings in my code;
8 Answers
8
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What is the most efficient way to store a list in the Django models?
Currently I have a lot of python objects in my code similar to the following:
12 Answers
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How do I call setattr() on the current module?
...ables when called in a function, and then it must be treated as R/O -- the Python online docs can be a bit confusing about this specific distinction).
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Python __call__ special method practical example
...torial function that contains a static variable (as that's not possible in Python).
class Factorial:
def __init__(self):
self.cache = {}
def __call__(self, n):
if n not in self.cache:
if n == 0:
self.cache[n] = 1
else:
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Reading specific lines only
... 29:
break
fp.close()
Note that i == n-1 for the nth line.
In Python 2.6 or later:
with open("file") as fp:
for i, line in enumerate(fp):
if i == 25:
# 26th line
elif i == 29:
# 30th line
elif i > 29:
break
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Remove carriage return in Unix
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The simplest way on Linux is, in my humble opinion,
sed -i 's/\r$//g' <filename>
The strong quotes around the substitution operator 's/\r//' are essential. Without them the shell will interpret \r as an escape+r and reduce it to a plain...
Quick-and-dirty way to ensure only one instance of a shell script is running at a time
...it too long for a lock.
Caveat: this particular command is a part of util-linux. If you run an operating system other than Linux, it may or may not be available.
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