Region: IOError: [Errno 22] invalid mode (‘w’) or filename

by

Use forward slashes:

'path/regionlog.txt'

Or raw strings:

r'path\regionlog.txt'

Or at least escape your backslashes:

'path\\regionlog.txt'

\r is a carriage return.

Another option: use os.path.join and you won’t have to worry about slashes at all:

output = os.path.abspath(os.path.join('path', 'regionlog.txt'))

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