Procs

proc encodings.normalize_encoding(encoding: string): string {....raises: [],
    tags: [], forbids: [].}

Normalize an encoding name.

Normalization works as follows: all non-alphanumeric characters except the dot used for Python package names are collapsed and replaced with a single underscore, e.g. ' -;#' becomes '_'. Leading and trailing underscores are removed.

Note that encoding names should be ASCII only.

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proc Py_normalize_encoding(encoding: string): string {....raises: [], tags: [],
    forbids: [].}

Normalize an encoding name: similar to encodings.normalize_encoding(), but also convert to lowercase. Source   Edit