Python——Utilities工具

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')

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