How to Fix Python's 'UnicodeDecodeError: 'charmap' codec can't decode byte...'?

Decoding Error: Character Mapped to Undefined

While attempting to read a text file, a Python 3 program encounters an error:

UnicodeDecodeError: 'charmap' codec can't decode byte 0x90 in position 2907500: character maps to `<undefined>`

Explanation:

This error signifies that the 'charmap' codec cannot decode a specific byte in the text file. The 'charmap' codec is used for character encodings that map bytes to characters directly.

Solution:

To resolve this error, it is necessary to identify the correct encoding of the text file and specify it when opening the file. Since the byte 0x90 does not have a valid mapping in the CP1252 encoding, the file likely uses a different encoding, such as UTF-8 or Latin-1.

To open the file using the correct encoding, add the encoding argument:

file = open(filename, encoding="utf-8")

For Latin-1 encoding:

file = open(filename, encoding="latin-1")

Note:

Refer to the documentation on "How to determine the encoding of text" to ascertain the correct encoding of the text file.

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