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Python中操作文件之write()方法的使用教程
2020-11-27 14:41:24 责编:小采
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write()方法把字符串str写入文件。没有返回值。由于缓冲,字符串可能不实际显示文件,直到flush()或close()方法被调用。
语法

以下是write()方法的语法:

fileObject.write( str )

参数

  • str -- 这是要被写入的文件中的字符串。
  • 返回值

    此方法不返回任何值。
    例子

    下面的例子显示write()方法的使用。

    #!/usr/bin/python
    
    # Open a file in write 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
    
    str = "This is 6th line"
    # Write a line at the end of the file.
    fo.seek(0, 2)
    line = fo.write( str )
    
    # Now read complete file from beginning.
    fo.seek(0,0)
    for index in range(6):
     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
    
    

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