Python File writelines() Method 按行写文件

最新推荐文章于 2025-07-08 14:28:28 发布

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本文详细介绍了Python中使用writelines()方法一次性将一系列字符串写入文件的操作过程，包括方法语法、参数说明、返回值以及一个实际的例子演示。

原文地址：http://www.tutorialspoint.com/python/file_writelines.htm

Description

The method writelines() writes a sequence of strings to the file.

The sequence can be any iterable object producing strings, typically a list of strings. There is no return value.

Syntax

Following is the syntax for writelines() method −

fileObject.writelines( sequence )

Parameters

sequence -- This is the Sequence of the strings.

Return Value

This method does not return any value.

Example

The following example shows the usage of writelines() method

This is 1st line
This is 2nd line
This is 3rd line
This is 4th line
This is 5th line

#!/usr/bin/python'
# Open a file in witre 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

seq = ["This is 6th line\n", "This is 7th line"]
# Write sequence of lines at the end of the file.
fo.seek(0, 2)
line = fo.writelines( seq )

# Now read complete file from beginning.
fo.seek(0,0)
for index in range(7):
   line = fo.next()
   print "Line No %d - %s" % (index, line)

# Close opend file
fo.close()

When we run above program, it produces following result −

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

Line No 6 - This is 7th line