While UTF-8 is designed to be robust in the face of small errors, other multi-byte encodings such as UTF-16 and UTF-32 can't cope with dropped or extra bytes, which will then affect how accurately line separators can be located. Take into account that not all decoding errors can be recovered from gracefully. with open("test.csv", encoding="utf8", errors="surrogateescape") as f:Įrrors = detect_decoding_errors_line(line) Works with text lines decoded with the surrogateescape """Return decoding errors in a line of text _surrogates = re.compile(r"")ĭef detect_decoding_errors_line(l, _s=_surrogates.finditer): If you must detect errors on a line-by-line basis, use the surrogateescape handler and test each line read for codepoints in the surrogate range: import re Note that decoding takes place per buffered block of data, not per textual line. Opening the file with anything other than 'strict' ( 'ignore', 'replace', etc.) will then let you read the file without exceptions being raised. 'backslashreplace' (also only supported when writing) replaces unsupported characters with Python’s backslashed escape sequences.Characters not supported by the encoding are replaced with the appropriate XML character reference nnn. 'xmlcharrefreplace' is only supported when writing to a file.This is useful for processing files in an unknown encoding. These private code points will then be turned back into the same bytes when the surrogateescape error handler is used when writing data. 'surrogateescape' will represent any incorrect bytes as code points in the Unicode Private Use Area ranging from U+DC80 to U+DCFF.'replace' causes a replacement marker (such as '?') to be inserted where there is malformed data.Note that ignoring encoding errors can lead to data loss. The default value of None has the same effect. 'strict' to raise a ValueError exception if there is an encoding error.A variety of standard error handlers are available, though any error handling name that has been registered with codecs.register_error() is also valid. You can tell open() how to treat decoding errors, with the errors keyword:Įrrors is an optional string that specifies how encoding and decoding errors are to be handled–this cannot be used in binary mode. It is important to use the correct codec when opening a file. Your file doesn't appear to use the UTF-8 encoding.
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