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How to sort a list of strings numerically?
...at this sounds trivial but I did not realize that the sort() function of Python was weird. I have a list of "numbers" that are actually in string form, so I first convert them to ints, then attempt a sort.
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Is there a way to pass optional parameters to a function?
Is there a way in Python to pass optional parameters to a function while calling it and in the function definition have some code based on "only if the optional parameter is passed"
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Should I use multiplication or division?
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Python:
time python -c 'for i in xrange(int(1e8)): t=12341234234.234 / 2.0'
real 0m26.676s
user 0m25.154s
sys 0m0.076s
time python -c 'for i in xrange(int(1e8)): t=12341234234.234 * 0.5'
real 0m17.932s
user ...
What is the difference between an int and a long in C++?
...ytes
Windows Intel 64 4 bytes
Windows IA-64 4 bytes
Linux IA-32 4 bytes
Linux Intel 64 8 bytes
Linux IA-64 8 bytes
Mac OS X IA-32 4 bytes
Mac OS X Intel 64 8 bytes
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Why always ./configure; make; make install; as 3 separate steps?
...t means ./configure, make and make install. But another one can use SCons, Python related setup or something different.
As you see splitting each state makes things much easier for maintaining and deployment, especially for package maintainers and distros.
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C++特化模板函数的符号多重定义错误问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
...l.cpp 和主模块两个文件中——生成工程没有链接错误。去下载源代码自己尝试一下吧。
如果你正在为其他开发人员写模板库，extern 方式会很不爽，因为你必须创建一个带目标模块的链接库（lib），它包含有特化。如果你已经有...
Round a Floating Point Number Down to the Nearest Integer?
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This seems like the most Pythonic approach.
– Gyan Veda
Jun 16 '14 at 19:40
23
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Remove duplicate dict in list in Python
...you can remove duplicates using set (using a set comprehension here, older python alternative would be set(tuple(d.items()) for d in l)) and, after that, re-create the dictionaries from tuples with dict.
where:
l is the original list
d is one of the dictionaries in the list
t is one of the tuples...
mmap() vs. reading blocks
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I was trying to find the final word on mmap / read performance on Linux and I came across a nice post (link) on the Linux kernel mailing list. It's from 2000, so there have been many improvements to IO and virtual memory in the kernel since then, but it nicely explains the reason why mmap ...
Python list subtraction operation
...is a "set subtraction" operation. Use the set data structure for that.
In Python 2.7:
x = {1,2,3,4,5,6,7,8,9,0}
y = {1,3,5,7,9}
print x - y
Output:
>>> print x - y
set([0, 8, 2, 4, 6])
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