Python 3 File writelines()用法及代码示例

描述

方法writelines()将字符串序列写入文件。序列可以是任何产生字符串的可迭代对象，通常是一个字符串列表。没有返回值。

用法

以下是语法writelines()方法 -

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。

示例

下面的例子展示了 writelines() 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 in read/write mode
fo = open("abc.txt", "r+")
print ("Name of the file:", fo.name)

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

# Close opened file
fo.close()

结果

当我们运行上述程序时，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