"TypeError: bad argument type for built-in operation"
The csv.reader in Python 2.4 has known bugs; see http://mail.python.org/pipermail/tutor/2008-January/059758.html
In general, "bad argument type for built-in operation" crops up all over the place because it's the exception text generated by PyErr_BadArgument CPython API call. This means that the traceback won't be much use because the exception is raised in C code. Your best bet for debugging is to run Python under a debugger and set a breakpoint on PyErr_BadArgument.
Facundo Casco
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Updated on June 04, 2022Comments
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Facundo Casco almost 2 years
In what cases would Python throw this error:
"TypeError: bad argument type for built-in operation"The error was reported in this line of code:
csv.reader(open(file_name), dialect=dialect)I've tried to reproduce it but the closest I got was this error:
"TypeError: coercing to Unicode: need string or buffer, bool found"I've tried with Python2.7 and Python 2.5 on Linux and Python 2.4 on Windows XP