Python中操作文件之write()方法的使用教程_Python

Python中操作文件之write()方法的使用教程

2020-07-06 13:17脚本之家 Python

这篇文章主要介绍了Python中操作文件之write()方法的使用教程,是Python入门学习中的基础知识,需要的朋友可以参考下

write()方法把字符串str写入文件。没有返回值。由于缓冲，字符串可能不实际显示文件，直到flush()或close()方法被调用。
语法

以下是write()方法的语法：

1	`fileObject.write(` `str` `)`

参数

str -- 这是要被写入的文件中的字符串。

返回值

此方法不返回任何值。
例子

下面的例子显示write()方法的使用。

									#!/usr/bin/python

									# Open a file in write mode

									fo = open("foo.txt", "rw+")

									print "Name of the file: ", fo.name

									# Assuming file has following 5 lines

									# This is 1st line

									# This is 2nd line

									# This is 3rd line

									# This is 4th line

									# This is 5th line

									str = "This is 6th line"

									# Write a line at the end of the file.

									fo.seek(0, 2)

									line = fo.write( str )

									# Now read complete file from beginning.

									fo.seek(0,0)

									for index in range(6):

									  line = fo.next()

									  print "Line No %d - %s" % (index, line)

									# Close opend file

									fo.close()

当我们运行上面的程序，它会产生以下结果：

									Name of the file: foo.txt

									Line No 0 - This is 1st line

									Line No 1 - This is 2nd line

									Line No 2 - This is 3rd line

									Line No 3 - This is 4th line

									Line No 4 - This is 5th line

									Line No 5 - This is 6th line