File truncate() Method in Python 3
The method truncate() truncates the file's size. If the optional size argument is present,the file is truncated to (at most) that size.
The size defaults to the current position. The current
file position is not changed. Note that if a specified size exceeds the file's
current size, the result is platform-dependent.
Note: This method will not work in case the file is opened
in read-only mode.
Syntax
|
fileObject.truncate(
[ size ])
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Parameters
size - If this optional
argument is present, the file is truncated to (at most) that size.
Return Value
This method does not return any value.
Example
|
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
|
|
#!/usr/bin/python3
fo =
open("foo.txt", "r+")
print
("Name of the file: ", fo.name)
line =
fo.readline()
print
("Read Line: %s" % (line))
fo.truncate()
line =
fo.readlines()
print
("Read Line: %s" % (line))
# Close
opened file
fo.close()
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When we run the above program, it produces the
following result-
|
Name of
the file: foo.txt
Read
Line: This is 1s
Read
Line: []
|
