Often I need to print some diagnostic variables and have to construct a format string to include both name and value; but there is a quicker way! This is especially useful for tracing function call values (foo in example below)
Python, 18 lines
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Copy to clipboard1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | def get_names_dict(*args):
id2name = dict((id(val), key) for key, val in inspect.stack()[1][0].f_locals.items())
return dict((id2name[id(a)], a) for a in args)
# >>> a = 1
# >>> b = 'b'
# >>> print get_names_dict(a, b)
# {'a': 1, 'b': 'b'}
def foo(a, b, c, d, e):
#something interesting here
def main(argv):
a, b, c, d, e = get_some_interesting_values()
print 'calling foo with ', get_names_dict(a, b, c, d, e)
foo(a, b, c, d, e)
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I found is very convenient since the only difference with foo() call is the function name, all the vars are easily copy-pasted.
There is a potential flaw in the recipe if multiple references are assigned to the same variable (and will have the same id). There are a few reasonable things one can do - I am open to suggestions; but practically speaking this has not bothered me.
Another useful tool when you have a class is to __dict__.
class SomeClass: def __init__(self): self.a = "foobar" self.b = 5 self.c = 65
myClass = SomeClass() print myClass.__dict__
What about built-in functions- locals() and vars(). Don`t they fits your needs ?