python中writelines的参数_详解详解Python中writelines()方法的使用

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 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()

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

Line No 6 - This is 7th line

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