forked from Lephenixnoir/PythonExtra
783b1a868f
This is a partial implementation of PEP 448 to allow unpacking multiple star args in a function or method call. This is implemented by changing the emitted bytecodes so that both positional args and star args are stored as positional args. A bitmap is added to indicate if an argument at a given position is a positional argument or a star arg. In the generated code, this new bitmap takes the place of the old star arg. It is stored as a small int, so this means only the first N arguments can be star args where N is the number of bits in a small int. The runtime is modified to interpret this new bytecode format while still trying to perform as few memory reallocations as possible. Signed-off-by: David Lechner <david@pybricks.com>
54 lines
808 B
Python
54 lines
808 B
Python
# function calls with *pos
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def foo(a, b, c):
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print(a, b, c)
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foo(*(), 1, 2, 3)
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foo(*(1,), 2, 3)
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foo(*(1, 2), 3)
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foo(*(1, 2, 3))
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foo(1, *(2, 3))
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foo(1, 2, *(3,))
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foo(1, 2, 3, *())
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foo(*(1,), 2, *(3,))
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foo(*(1, 2), *(3,))
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foo(*(1,), *(2, 3))
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# Another sequence type
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foo(1, 2, *[100])
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# Iterator
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foo(*range(3))
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# pos then iterator
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foo(1, *range(2, 4))
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# an iterator with many elements
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def foo(*rest):
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print(rest)
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foo(*range(10))
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# method calls with *pos
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class A:
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def foo(self, a, b, c):
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print(a, b, c)
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a = A()
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a.foo(*(), 1, 2, 3)
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a.foo(*(1,), 2, 3)
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a.foo(*(1, 2), 3)
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a.foo(*(1, 2, 3))
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a.foo(1, *(2, 3))
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a.foo(1, 2, *(3,))
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a.foo(1, 2, 3, *())
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a.foo(*(1,), 2, *(3,))
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a.foo(*(1, 2), *(3,))
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a.foo(*(1,), *(2, 3))
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# Another sequence type
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a.foo(1, 2, *[100])
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# Iterator
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a.foo(*range(3))
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