def foo(shell):
    pass


foo(shell=True)

foo(shell={**{}})
foo(shell={**{**{}}})

# Truthy non-bool values for `shell`
foo(shell=(i for i in ()))
foo(shell=lambda: 0)

# f-strings guaranteed non-empty
foo(shell=f"{b''}")
x = 1
foo(shell=f"{x=}")

# Additional truthiness cases for generator, lambda, and f-strings
foo(shell=(i for i in ()))
foo(shell=lambda: 0)
foo(shell=f"{b''}")
x = 1
foo(shell=f"{x=}")
print(bool(dict(shell=f"{f""!s}")["shell"]))

# Unknown truthiness
print(bool(dict(shell=f"{"x":.0}")["shell"]))


class C:
    def __gt__(self, other):
        return ""


print(bool(dict(shell=f"{C() > C()}")["shell"]))