Beginning Python From Novice to Professional (8) － 文件方法
浏览数：20 /
时间：2015年06月08日
文件方法
读写：
#!/usr/bin/env python
f = open('somefile.txt','w')
f.write('Hello,')
f.write('World!')
f.close()
f = open('somefile.txt','r')
print f.read(5)Hello使用基本文件方法：
#!/usr/bin/env python
f = open(r'somefile.txt')
print f.read()
f.close()
f = open(r'somefile.txt')
for i in range(3):
print str(i) + ':' + f.readline()
f.close()
import pprint
pprint.pprint(open(r'somefile.txt').readlines())
f = open('somefile.txt','w')
f.write('we\nchange\nthis file!')
f.close()
f = open(r'somefile.txt')
print f.read()
f.close()
f = open(r'somefile.txt')
lines = f.readlines()
f.close()
lines[1] = "changed\n"
f = open(r'somefile.txt','w')
f.writelines(lines)
f.close()
f = open(r'somefile.txt')
print f.read()
f.close()This is a Test! 0:This 1:is a 2:Test! ['This\n', 'is a\n', 'Test!\n'] we change this file! we changed this file!文件解包：
#!/usr/bin/env python
f = open(r'somefile.txt','w')
f.write('First line\n')
f.write('Second line\n')
f.write('Third line\n')
f.close()
lines = list(open('somefile.txt'))
print lines
first,second,third = open('somefile.txt')
print first
print second
print third['First line\n', 'Second line\n', 'Third line\n'] First line Second line Third line
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