Beginning Python From Novice to Professional(8)-ファイルメソッド

ファイルメソッド
読み書き:

#!/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

基本ファイルメソッドを使用します.

#!/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
change
this 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
"
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
', 'is a
', 'Test!
']
we
change
this file!
we
changed
this file!

ファイル:

#!/usr/bin/env python
f = open(r'somefile.txt','w')
f.write('First line
')
f.write('Second line
')
f.write('Third line
')
f.close()
lines = list(open('somefile.txt'))
print lines
first,second,third = open('somefile.txt')
print first
print second
print third

['First line
', 'Second line
', 'Third line
']
First line

Second line

Third line