Truncate () method truncates the file size. If the optional size argument is specified, the file is truncated to (maximum) that size. The default size corresponds to the current position. The current file position does not change. Note that if the specified size exceeds the current file size, the result is platform-dependent: the options are: the file can remain unchanged, grow to the specified size as if it were filled with zeros, or grow to the specified size with undefined new content.
To truncate a file, you can open the file in append or write mode.
fileObject.truncate (size) pre >
See image below for file size.
Let`s change the file size to 100 bytes.
In the above approaches, every time a file is opened, it must be closed explicitly. If you forget to close the file, it can lead to several errors in your code, i.e. many changes to files do not take effect until the file is properly closed. You can use the
with assertion to prevent this. Python`s with statement is used to handle exceptions to make your code cleaner and much more readable. This makes it easier to manage shared resources such as file streams. Notice the following code example for how using the
with statement makes your code cleaner. There is no need to call
file.close () when used with assertion. The
with statement itself ensures that resources are acquired and released correctly.
Let`s change the above file to 50 bytes
) as fp:
Note Note: to learn more about the statement,
Submit new EBook