Tutorial on using the Truncate () method of manipulating files in Python

The truncate () method truncates the size of the file. If an optional dimension parameter exists, the file is truncated (up to) the size.

The size defaults to the current position. The current file location does not change. Note that if a specified size exceeds the current size of the file, the results are dependent on the platform.

Note: This method does not open in read-only mode when the file is working.
Grammar

The following is the syntax for the Truncate () method:

Fileobject.truncate ([size])

Parameters

Size--If an optional parameter exists, the file is truncated (up to).

return value

This method does not return any values.
Example

The following example shows the use of the Truncate () method.

#!/usr/bin/python# Open a filefo = open ("Foo.txt", "rw+") print "Name of the file:", fo.name# assuming file has following  5 lines# This was 1st line# this is 2nd line# This is 3rd line# This is 4th line# the is 5th lineline = Fo.readline () print "Read line:%s"% [line] # now truncate remaining file.fo.truncate () # Try to Read file Nowline = Fo.readline () print "Read Line:%s "% (line) # Close opend filefo.close ()

When we run the above program, it produces the following results:

Name of the File:foo.txtRead Line:this is 1st Lineread line:

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