En Wed, 07 Apr 2010 17:23:22 -0300, kwatch <kwa...@gmail.com> escribió:
Is it possible to raise exception with custom traceback to specify
file and line?
I'm creating a certain parser.
I want to report syntax error with the same format as other exception.
-------------------------
1: def parse(filename):
2: if something_is_wrong():
3: linenum = 123
4: raise Exception("syntax error on %s, line %s" % (filename,
linenum))
5:
6: parse('example.file')
-------------------------
my hope is:
-------------------------
Traceback (most recent call last):
File "/tmp/parser.py", line 6, in <module>
parse('example.file')
File "/tmp/parser.py", line 4, in parse
raise Exception("syntax error on %s, line %s" % (filename,
linenum))
File "/tmp/example.file", line 123
foreach item in items # wrong syntax line
Exception: syntax error
-------------------------
The built-in SyntaxError exception does what you want. Constructor
parameters are undocumented, but they're as follows:
raise SyntaxError("A descriptive error message", (filename, linenum,
colnum, source_line))
colnum is used to place the ^ symbol (10 in this fake example). Output:
Traceback (most recent call last):
File "1.py", line 9, in <module>
foo()
File "1.py", line 7, in foo
raise SyntaxError("A descriptive error message", (filename, linenum,
colnum, "this is line 123 in example.file"))
File "example.file", line 123
this is line 123 in example.file
^
SyntaxError: A descriptive error message
--
Gabriel Genellina
--
http://mail.python.org/mailman/listinfo/python-list
