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codeql/python/ql/src/Expressions/IncorrectComparisonUsingIs.py at main · github/codeql · GitHub

DEFAULT = "default"

def get_color(name, fallback):

if name in COLORS:

return COLORS[name]

elif fallback is DEFAULT:

return DEFAULT_COLOR

else:

return fallback

#This works

print (get_color("spam", "def" + "ault"))

#But this does not

print (get_color("spam", "default-spam"[:7]))

#To fix the above code change to object

DEFAULT = object()

#Or if you want better repr() output:

class Default(object):

def __repr__(self):

return "DEFAULT"

DEFAULT = Default()