我正在运行一个程序,它正在处理3万个类似的文件。随机数量的它们停止并产生此错误…
File "C:\Importer\src\dfman\importer.py", line 26, in import_chr
data = pd.read_csv(filepath, names=fields)
File "C:\Python33\lib\site-packages\pandas\io\parsers.py", line 400, in parser_f
return _read(filepath_or_buffer, kwds)
File "C:\Python33\lib\site-packages\pandas\io\parsers.py", line 205, in _read
return parser.read()
File "C:\Python33\lib\site-packages\pandas\io\parsers.py", line 608, in read
ret = self._engine.read(nrows)
File "C:\Python33\lib\site-packages\pandas\io\parsers.py", line 1028, in read
data = self._reader.read(nrows)
File "parser.pyx", line 706, in pandas.parser.TextReader.read (pandas\parser.c:6745)
File "parser.pyx", line 728, in pandas.parser.TextReader._read_low_memory (pandas\parser.c:6964)
File "parser.pyx", line 804, in pandas.parser.TextReader._read_rows (pandas\parser.c:7780)
File "parser.pyx", line 890, in pandas.parser.TextReader._convert_column_data (pandas\parser.c:8793)
File "parser.pyx", line 950, in pandas.parser.TextReader._convert_tokens (pandas\parser.c:9484)
File "parser.pyx", line 1026, in pandas.parser.TextReader._convert_with_dtype (pandas\parser.c:10642)
File "parser.pyx", line 1046, in pandas.parser.TextReader._string_convert (pandas\parser.c:10853)
File "parser.pyx", line 1278, in pandas.parser._string_box_utf8 (pandas\parser.c:15657)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xda in position 6: invalid continuation byte
这些文件的来源/创建都来自同一个地方。纠正这个问题以继续导入的最佳方法是什么?
Pandas允许指定编码,但不允许忽略错误,不允许自动替换违规字节。因此,没有一种适合所有情况的方法,而是根据实际用例使用不同的方法。
You know the encoding, and there is no encoding error in the file.
Great: you have just to specify the encoding:
file_encoding = 'cp1252' # set file_encoding to the file encoding (utf8, latin1, etc.)
pd.read_csv(input_file_and_path, ..., encoding=file_encoding)
You do not want to be bothered with encoding questions, and only want that damn file to load, no matter if some text fields contain garbage. Ok, you only have to use Latin1 encoding because it accept any possible byte as input (and convert it to the unicode character of same code):
pd.read_csv(input_file_and_path, ..., encoding='latin1')
You know that most of the file is written with a specific encoding, but it also contains encoding errors. A real world example is an UTF8 file that has been edited with a non utf8 editor and which contains some lines with a different encoding. Pandas has no provision for a special error processing, but Python open function has (assuming Python3), and read_csv accepts a file like object. Typical errors parameter to use here are 'ignore' which just suppresses the offending bytes or (IMHO better) 'backslashreplace' which replaces the offending bytes by their Python’s backslashed escape sequence:
file_encoding = 'utf8' # set file_encoding to the file encoding (utf8, latin1, etc.)
input_fd = open(input_file_and_path, encoding=file_encoding, errors = 'backslashreplace')
pd.read_csv(input_fd, ...)
这个答案似乎是CSV编码问题的万能答案。如果你的头文件出现了奇怪的编码问题,就像这样:
>>> f = open(filename,"r")
>>> reader = DictReader(f)
>>> next(reader)
OrderedDict([('\ufeffid', '1'), ... ])
然后在CSV文件的开头有一个字节顺序标记(BOM)字符。这个答案解决了这个问题:
Python读取csv - BOM嵌入到第一个键
解决方案是用encoding="utf-8-sig"加载CSV:
>>> f = open(filename,"r", encoding="utf-8-sig")
>>> reader = DictReader(f)
>>> next(reader)
OrderedDict([('id', '1'), ... ])
希望这能帮助到一些人。