Python file method write() writes string str to the file. There is no return value. Due to buffering, the string may not actually show up in the file until the flush() or close() method is called.
Following is the syntax for write() method:
fileObject.write( str )
This method does not return any value.
The following example shows the usage of the truncate() method.
This is 1st line This is 2nd line This is 3rd line This is 4th line This is 5th line #!/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()
When we run the above program, it produces the following result:
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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