get_valid_name(name)
Returns a filename suitable for use with the underlying storage system. The name argument passed to this method is either the original filename sent to the server or, if upload_to is a callable, the filename returned by that method after any path information is removed. Override this to customize how non-standard characters are converted to safe filenames.
Changed in Django 1.9:
In older versions, this method was not called when upload_to was a callable.
The code provided on Storage retains only alpha-numeric characters, periods and underscores from the original filename, removing everything else.
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