writelines()方法写入字符串序列到文件。该序列可以是任何可迭代的对象产生字符串，字符串为一般列表。没有返回值。
语法

以下是writelines()方法的语法：

fileObject.writelines( sequence )

参数

• sequence -- 这是字符串的序列。

返回值

此方法不返回任何值。
例子

下面的例子显示writelines()方法的使用。

#!/usr/bin/python'# Open a file in witre modefo = 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 lineseq = ["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 filefo.close()

当我们运行上面的程序，它会产生以下结果：

Name of the file: foo.txtLine No 0 - This is 1st lineLine No 1 - This is 2nd lineLine No 2 - This is 3rd lineLine No 3 - This is 4th lineLine No 4 - This is 5th lineLine No 5 - This is 6th lineLine No 6 - This is 7th line