Python 3 - 文件 writelines() 方法

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  描述

  方法writelines()将字符串序列写入文件。序列可以是任何可生成字符串的可迭代对象，通常是字符串列表。没有返回值。
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  句法

  以下是语法writelines()方法 -

  
  fileObject.writelines( sequence )
  

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  参数

  sequence− 这是字符串的序列。
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  返回值

  此方法不返回任何值。
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  例子

  以下示例显示了 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
  

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  #!/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()
  

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  结果

  当我们运行上面的程序时，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
  

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