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I believe the idiom to check, if a parameter wasn’t set is to use an object() instance as default value. _notset = object() def foo(x=_notset): if x

I believe the idiom to check, if a parameter wasn’t set is to use an object() instance as default value. _notset = object() def foo(x=_notset): if x is _notset: print("foo was called as foo()")

andi999 6y ago
Thats nice. Thanks. Where did you find it.
- vasachi 6y ago
  I think it is from somewhere in standard library.