Python 3 File read()用法及代碼示例

描述

方法read()從文件中最多讀取 size 個字節。如果讀取在獲得 size 字節之前命中 EOF，則它僅讀取可用字節。

用法

以下是語法read()方法 -

fileObject.read( size );

參數

size- 這是要從文件中讀取的字節數。

返回值

此方法返回在字符串中讀取的字節。

示例

下麵的例子展示了 read() 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.read(10)
print ("Read Line:%s" % (line))

# Close opened file
fo.close()

結果

當我們運行上述程序時，它會產生以下結果 -

Name of the file: foo.txt
Read Line:This is 1s