Python——Utilities工具

yanqiufang

以下是学习goole PYTHON教程过程中的一些笔记。
'#' 后面的是输出，希望你能从中获取你想要的。


Closing Thoughts
a = ['aaaa', 'bb', 'cccc']
a
#['aaaa', 'bb', 'cccc']


result = []
[   len(s)  for s in a ]
#[4,2,5]


a = [1, 2, 3, 4]
a
#[1, 2, 3, 4]
[ num*num for num in a if num > 2]
#[9, 16]


import os
os.listdir('.')
#['DLLs', 'Doc', 'include', 'Lib', 'libs', 'LICENSE.txt', 'NEWS.txt', 'python.exe', 'pythonw.exe', 'README.txt', 'tcl', 'Tools', 'w9xpopen.exe']


import re
[  f for f in os.listdir('.') if re.search(r'__\w+__', f) ]





Utilities:URLs and HTTP,Exceptions


try:
  f = open(filename)
  text = f.read()
  print '---', filename
  print text
exception IOError:
  print 'IO Error', filename


import urllib


uf = urllib.urlopen('http://google.com')
uf.read()


urllib.urlretrieve('http://google.com/intl/en_ALL/images/logo.gif', 'blah.gif')