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> It doesn't solve the case when an identifier or number is used as a function:
In the first case we should convert an argument to integer.
 ns = {}
 exec('''if True:
 def func(arg):
 n = int(arg)
 return {}
 '''.format(plural), ns)
 return ns['func']
Or raise an exception if argument is not integer.
In the second case I think we can just left it as is. This is not valid C expression.
Or we can add try/except in above code and convert TypeError to ValueError if this is more preferable exception.