I keep running into the following need and wonder if we should do
something about it.
Whenever I want to run a method over the arguments of an expression
(essential doing a deep processing of an expression) I have to set up
the following filter:
if expr is None: # because integrals use None as a marker
return None
elif type(expr) in (list, set, tuple): # because integrals use
tuples
return type(expr)([foo(a) for a in expr])
return expr.func(*[foo(a) for a in expr.args or expr]) # "or expr"
since Atoms don't have args
Does anyone suggest a better approach or solution to the problem? or
see any problems with the above?
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