Python 檔案操作

檔案操作，無外乎讀寫，但首先你要開啟檔案。

f = open(filename, mode)filename是檔名，可以帶目錄；mode是讀寫模式（可以是讀，寫，追加等）；f是file handler。

f.close()

注意，write不會自動加入\n，這一點不像print。

f = open('myfile.txt', 'w')    # open file for writing

f.write('this is first line\n')   # write a line to the file
f.write('this is second line\n')  # write one more line
f.close()

讀取所有內容

f = open('myfile.txt', 'r')

f.read()

'this is first line\nthis is second line\n'

f.close()

f = open('myfile.txt','r')

f.readlines()

['this is first line\n', 'this is second line\n']

f.close()

f = open('myfile.txt','r')

f.readline()

'this is first line\n'

f.close()

f = open('myfile.txt','a')

f.write('this is third line\n')

f.close()

f = open('myfile.txt','r')

for line in f:
print line,

this is first line

this is second line
this is third line

f.close()

with open('myfile.txt','r') as f:

for line in f:
print line,

this first line

this second line
this is third line

with open('myfile.txt','r') as f:

for line in f.readlines():
print line,

this is first line

this is second line
this is third line

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