Python 3 File readlines()用法及代碼示例

描述

方法readlines()使用 readline() 讀取直到 EOF 並返回包含行的列表。如果存在可選的 sizehint 參數，而不是讀取到 EOF，而是讀取總計大約 sizehint 字節(可能在向上舍入到內部緩衝區大小之後)的整行。

僅當立即遇到 EOF 時才返回空字符串。

用法

以下是語法readlines()方法≫

fileObject.readlines( sizehint );

參數

sizehint─ 這是要從文件中讀取的字節數。

返回值

此方法返回一個包含行的列表。

示例

下麵的例子展示了 readlines() 方法的用法。

Assuming that 'foo.txt' file contains following text:
This is 1st line
This is 2nd line
This is 3rd line
This is 4th line
This is 5th line

#!/usr/bin/python3

# Open a file
fo = open("foo.txt", "r+")
print ("Name of the file:", fo.name)

line = fo.readlines()
print ("Read Line:%s" % (line))

line = fo.readlines(2)
print ("Read Line:%s" % (line))

# Close opened file
fo.close()

結果

當我們運行上麵的程序時，它會產生以下結果——

Name of the file: foo.txt
Read Line:['This is 1st line\n', 'This is 2nd line\n', 
   'This is 3rd line\n', 'This is 4th line\n', 'This is 5th line\n']
Read Line: