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Why (0-6) is -6 = False? [duplicate]
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All integers from -5 to 256 inclusive are cached as global objects sharing the same address with CPython, thus the is test passes.
This artifact is explained in detail in http://www.laurentluce.com/posts/python-integer-objects-implementa...
Evaluating a mathematical expression in a string
...low, I've rewrapped fourFn into a numeric parser class for easier reuse.
from __future__ import division
from pyparsing import (Literal, CaselessLiteral, Word, Combine, Group, Optional,
ZeroOrMore, Forward, nums, alphas, oneOf)
import math
import operator
__author__ = 'Paul...
How can I move a single directory from a git repository to a new repository whilst maintaining the h
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You can use git filter-branch to rewrite the history of a project. From the documentation:
To rewrite the repository to look as
if foodir/ had been its project root,
and discard all other history:
git filter-branch --subdirectory-filter foodir -- --all
Make several copies of your...
Unix shell script find out which directory the script file resides?
...sing $BASH_SOURCE, and it returns what I needed. My script is being called from another script, and $0 returns . while $BASH_SOURCE returns the right subdirectory (in my case scripts).
– David Rissato Cruz
Dec 3 '15 at 16:28
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Upgrade python packages from requirements.txt using pip command
How do I upgrade all my python packages from requirements.txt file using pip command?
13 Answers
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C++ new int[0] — will it allocate memory?
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From 5.3.4/7
When the value of the expression in a direct-new-declarator is zero, the allocation function is called to allocate an array with no elements.
From 3.7.3.1/2
The effect of dereferencing a pointer returne...
efficient circular buffer?
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popping from the head of a list causes the whole list to be copied, so is inefficient
You should instead use a list/array of fixed size and an index which moves through the buffer as you add/remove items
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How to process SIGTERM signal gracefully?
...down gracefully. The False value is set only once, and then it can only go from False to True so multiple access is not an issue.
– Alceste_
Jul 25 '18 at 15:35
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How Do I Fetch All Old Items on an RSS Feed?
...y reason that Google Reader has more information is that it remembered it from when it came up the first time.
There is some information on something like this talked about as an extension to the ATOM protocol, but I don't know if it is actually implemented anywhere.
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Diff output from two programs without temporary files
... hang or use a temporary file on disk. You also cannot use psub for output from your command.
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