Python中操作檔案之write()方法的使用教程

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   這篇文章主要介紹了Python中操作檔案之write()方法的使用教程,是Python入門學習中的基礎知識,需要的朋友可以參考下

  write()方法把字串str寫入檔案。沒有傳回值。由於緩衝,字串可能不實際顯示檔案,直到flush()或close()方法被調用。

  文法

  以下是write()方法的文法:

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1 fileObject.write( str )

  參數

  str -- 這是要被寫入的檔案中的字串。

  傳回值

  此方法不返回任何值。

  例子

  下面的例子顯示write()方法的使用。

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 #!/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()

  當我們運行上面的程式,它會產生以下結果:

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1 2 3 4 5 6 7 8 9 10 11 12 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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