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# copied from python-2.7.3's traceback.py
# CHANGES:
# - some_str is replaced, trying to create unicode strings
#
from __future__ import absolute_import, division, print_function
import types
def format_exception_only(etype, value):
"""Format the exception part of a traceback.
The arguments are the exception type and value such as given by
sys.last_type and sys.last_value. The return value is a list of
strings, each ending in a newline.
Normally, the list contains a single string; however, for
SyntaxError exceptions, it contains several lines that (when
printed) display detailed information about where the syntax
error occurred.
The message indicating which exception occurred is always the last
string in the list.
"""
# An instance should not have a meaningful value parameter, but
# sometimes does, particularly for string exceptions, such as
# >>> raise string1, string2 # deprecated
#
# Clear these out first because issubtype(string1, SyntaxError)
# would throw another exception and mask the original problem.
if (isinstance(etype, BaseException) or
isinstance(etype, types.InstanceType) or
etype is None or type(etype) is str):
return [_format_final_exc_line(etype, value)]
stype = etype.__name__
if not issubclass(etype, SyntaxError):
return [_format_final_exc_line(stype, value)]
# It was a syntax error; show exactly where the problem was found.
lines = []
try:
msg, (filename, lineno, offset, badline) = value.args
except Exception:
pass
else:
filename = filename or "<string>"
lines.append(' File "%s", line %d\n' % (filename, lineno))
if badline is not None:
if isinstance(badline, bytes): # python 2 only
badline = badline.decode('utf-8', 'replace')
lines.append(u' %s\n' % badline.strip())
if offset is not None:
caretspace = badline.rstrip('\n')[:offset].lstrip()
# non-space whitespace (likes tabs) must be kept for alignment
caretspace = ((c.isspace() and c or ' ') for c in caretspace)
# only three spaces to account for offset1 == pos 0
lines.append(' %s^\n' % ''.join(caretspace))
value = msg
lines.append(_format_final_exc_line(stype, value))
return lines
def _format_final_exc_line(etype, value):
"""Return a list of a single line -- normal case for format_exception_only"""
valuestr = _some_str(value)
if value is None or not valuestr:
line = "%s\n" % etype
else:
line = "%s: %s\n" % (etype, valuestr)
return line
def _some_str(value):
try:
return unicode(value)
except Exception:
try:
return str(value)
except Exception:
pass
return '<unprintable %s object>' % type(value).__name__
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