Web Reference: FileExistsError is a built-in exception that is raised when an operation attempts to create a file or directory that already exists. This exception is part of the OSError family, which covers a variety of system-related errors. However, if you attempt to create a directory that already exists using certain functions, Python will raise a FileExistsError: [Errno 17] File exists. This guide explains why this error occurs and presents the standard Pythonic ways to handle or prevent it, primarily using os.makedirs(). Mar 25, 2026 Β· In Python, all exceptions must be instances of a class that derives from BaseException. In a try statement with an except clause that mentions a particular class, that clause also handles any exception classes derived from that class (but not exception classes from which it is derived).
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Last Updated: April 7, 2026
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