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How to read a file in reverse order?
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for line in reversed(open("filename").readlines()):
print line.rstrip()
And in Python 3:
for line in reversed(list(open("filename"))):
print(line.rstrip())
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Confused about __str__ on list in Python [duplicate]
...ting an object uses str(); printing a list containing an object uses str() for the list itself, but the implementation of list.__str__() calls repr() for the individual items.
So you should also overwrite __repr__(). A simple
__repr__ = __str__
at the end of the class body will do the trick.
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ruby send method passing multiple parameters
...g is a broad concept: email is sent, data gets sent to I/O sockets, and so forth. It’s not uncommon for programs to define a method called send that conflicts with Ruby’s built-in send method. Therefore, Ruby gives you an alternative way to call send: __send__. By convention, no one ever writes ...
Chaining multiple filter() in Django, is this a bug?
...nd it is that they are subtly different by design (and I am certainly open for correction): filter(A, B) will first filter according to A and then subfilter according to B, while filter(A).filter(B) will return a row that matches A 'and' a potentially different row that matches B.
Look at the examp...
What is the GAC in .NET?
Just looking for a short overview of GAC for a layman, not a link please.
8 Answers
8
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filename and line number of python script
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Does using this method have any performance impact (like minor increase in run time or more CPU needed ) ?
– gsinha
Dec 14 '14 at 5:41
8
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How do I detect unsigned integer multiply overflow?
...'t know about C++), unsigned arithmetic does not overflow ... so, at least for C, your point is moot :)
With signed integers, once there has been overflow, undefined behaviour (UB) has occurred and your program can do anything (for example: render tests inconclusive).
#include <limits.h>
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Can I use __init__.py to define global variables?
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doesn't the second way only work for constants? from mypackage.constants import * will place copies of MY_CONSTANT in every submodule rather than a reference to the same variable
– hardmooth
Mar 18 '16 at 7:17
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How to extract the decision rules from scikit-learn decision-tree?
... feature_names[i] if i != _tree.TREE_UNDEFINED else "undefined!"
for i in tree_.feature
]
print "def tree({}):".format(", ".join(feature_names))
def recurse(node, depth):
indent = " " * depth
if tree_.feature[node] != _tree.TREE_UNDEFINED:
name = f...
Representing graphs (data structure) in Python
...tions might help. How does one go about implementing them in Python? As for the libraries, this question has quite good answers.
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