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 · 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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