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')