Bugs item #1569374, was opened at 2006-10-02 11:48
Message generated for change (Settings changed) made by scott_marks
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Category: Python Interpreter Core
Group: Python 2.4
Status: Open
>Resolution: Duplicate
Priority: 5
Submitted By: applebucks (scott_marks)
Assigned to: Nobody/Anonymous (nobody)
Summary: sys.settrace cause curried parms to show up as attributes
Initial Comment:
The code below exhibits different behavior depending on
whether it invokes sys.settrace ('-t' option) or not.
This means that (in a more complicated case) debugging
the code (which uses sys.settrace) makes it fail.
Reported v 2.4, but the same behavior on 2.5. Any ideas?
""" Demonstrace that tracing messes up curried class
definitions """
# Some simple command line parsing: -t or --trace means
trace, nothing means don't trace
import sys
def usage( ):
print 'Usage:', sys.argv[ 0 ], '[-t | --trace]'
sys.exit( 1 )
if 1 == len( sys.argv ):
pass
elif 2 == len( sys.argv ):
if sys.argv[ 1 ]=='-t' or sys.argv[ 1 ]=='--trace':
def trace ( frame, event, arg ):
# print frame, event, arg
return trace
sys.settrace( trace )
else:
usage( )
else:
usage( )
# The test: define a class factory with a curried
member function
def the_factory( parm1 ):
class the_class( object ):
def curried( self ): return parm1
return the_class
x = the_factory( 42 )
y = x( )
try:
x.parm1
print "Failure: x (the manufactured class) has
attribute parm1?!"
except AttributeError:
print "Success with the manufactured class!"
try:
y.parm1
print "Failure: y (the instance) has attribute parm1?!"
except AttributeError:
print "Success with the instance!"
assert y.curried( ) == 42, "Currying didn't work?!"
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