Python 文件 writelines()方法

writelines()方法会将字符串序列写入文件中。序列可以是任何可迭代对象，生产字符串的典型对象是字符串列表。该方法没有返回值。

语法

writelines()方法的语法如下：

fileObject.writelines( sequence )

参数

sequence - 这是字符串的序列。

返回值

该方法不返回任何值。

下面的示例显示了writelines()方法的用法。

假设’foo.txt’文件包含以下文本-

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

示例

# Open a file in read/write mode
fo=open("foo.txt","r+")
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 )
fo.seek(0,0)
while True:
   try:
      line=next(fo)
      print (line)
   except:
      StopIteration
      break
fo.close()

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