Hi,
I am a little bit confused with `locals` builtin in these moments:
1. The documentation says that _free varaibles_ are returned, which seems
incorrect description. In my mind the term free variable refers to
variables used in a function that are not local variables nor parameters of
that function.
In docs: "Update and return a dictionary representing the current local
symbol table. Free variables are returned by `locals()` when it is called
in function blocks, but not in class blocks."
>>> def func():
b = 12
print(locals(), ' : ', id(locals))
c = 13
print(locals(), ' : ', id(locals))
>>> print("Free variables: ", func.__code__.co_names)
>>> print("Local variables: ", func.__code__.co_varnames)
Free variables: ('print', 'locals', 'id')
Local variables: ('b', 'c')
2. The documentation has a note that "The contents of this dictionary
should not be modified". Which implies that it is a read only mapping. So
the question why it is `dict` instead of `types.MappingProxyType`?
3. There is one more moment: local variables had been determined when
function was compiled. But `locals` returns _some_ current runtime copy. I
find this also confusing:
>>> def func1():
loc = locals()
b = 12
return loc
>>> def func2():
b = 12
loc = locals()
return loc
>>> func1()
{ }
>>> func2()
{'b': 12}
With kind regards,
-gdg
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