PythonExtra/tests/basics/fun_calldblstar4.py
David Lechner 1e99d29f36 py/runtime: Allow multiple **args in a function call.
This is a partial implementation of PEP 448 to allow multiple ** unpackings
when calling a function or method.

The compiler is modified to encode the argument as a None: obj key-value
pair (similar to how regular keyword arguments are encoded as str: obj
pairs).  The extra object that was pushed on the stack to hold a single **
unpacking object is no longer used and is removed.

The runtime is modified to decode this new format.

Signed-off-by: David Lechner <david@pybricks.com>
2022-03-31 16:54:00 +11:00

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Python

# test calling a function with multiple **args
def f(a, b=None, c=None):
print(a, b, c)
f(**{"a": 1}, **{"b": 2})
f(**{"a": 1}, **{"b": 2}, c=3)
f(**{"a": 1}, b=2, **{"c": 3})
try:
f(1, **{"b": 2}, **{"b": 3})
except TypeError:
print("TypeError")
# test calling a method with multiple **args
class A:
def f(self, a, b=None, c=None):
print(a, b, c)
a = A()
a.f(**{"a": 1}, **{"b": 2})
a.f(**{"a": 1}, **{"b": 2}, c=3)
a.f(**{"a": 1}, b=2, **{"c": 3})
try:
a.f(1, **{"b": 2}, **{"b": 3})
except TypeError:
print("TypeError")