python hidden features
from http://stackoverflow.com/questions/101268/hidden-features-of-python
http://www.okpython.com/bbs/thread-3434-1-1.html
http://www.okpython.com/bbs/thread-3436-1-2.html
http://www.okpython.com/bbs/thread-3437-1-2.html
http://www.okpython.com/bbs/thread-3438-1-1.html
http://www.okpython.com/bbs/thread-3439-1-1.html
http://www.okpython.com/bbs/thread-3440-1-1.html
http://www.okpython.com/bbs/thread-3441-1-1.html
#74 太懒而不愿对字典进行初始化？没问题！
# n Python > 2.3:
from collections import defaultdict
In Python <= 2.3:
def defaultdict(type_):
class Dict(dict):
def __getitem__(self, key):
return self.setdefault(key, type_())
return Dict()
In any version:
d = defaultdict(list)
for stuff in lots_of_stuff:
d[stuff.name].append(stuff)
相关文档：
>>> a="abcd"
>>> ",".join(a)
'a,b,c,d'
>>> "|".join(['a','b','c'])
'a|b|c'
>>> ",".join(('a','b','c'))
'a,b,c'
>>> ",".join({'a':1,'b':2,'c':3})
'a,c,b' ......
如果你对Python矩阵转置的实际应用操作方案的转置不知道如何进行下一步时，你就你需要转置一个二维数组,将Python矩阵转置的行列互换.
这样就可以完成你所需要的应用操作，以下是文章的具体操作。
你需要转置一个二维数组,将行列互换，讨论:你需要确保该数组的行列数都是相同的.比如:
arr
= [[1, 2,&nbs ......
运行一句python命令
对vc设置路径
include:D:\PYTHON31\INCLUDE
lib:D:\PYTHON31\LIBS
#include "stdafx.h"
#include "python.h"
int main(int argc, char* argv[])
{
Py_Initialize() ;
PyRun_SimpleString("print('Hello')");
//PyRun_SimpleString("print(dir())");
Py_Finalize();& ......
"""A parser for HTML and XHTML."""
# This file is based on sgmllib.py, but the API is slightly different.
# XXX There should be a way to distinguish between PCDATA (parsed
# character data -- the normal case), RCDATA (replaceable character
# data -- only char and entity references and end tags a ......
