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https://github.com/micropython/micropython.git
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beb4c3188f
This change follows CPython behaviour, allowing use of:
from instance import method
to import a bound method from a class instance, eg registered via
setting `sys.modules["instance"] = instance`.
Admittedly this is probably a very rarely used pattern in Python, but it
resolves a long standing comment about whether or not this is actually
possible (it turns out it is possible!). A test is added to show how it
works.
The main reason for this change is to fix a problem with imports in the
webassembly port: prior to this fix, it was not possible to do `from
js_module import function`, where `js_module` is a JavaScript object
registered to be visible to Python through the webassembly API function
`registerJsModule(js_module)`. But now with this fix that is possible.
Signed-off-by: Damien George <damien@micropython.org>
39 lines
744 B
Python
39 lines
744 B
Python
# Test importing a method from a class instance.
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# This is not a common thing to do, but ensures MicroPython has the same semantics as CPython.
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import sys
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if not hasattr(sys, "modules"):
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print("SKIP")
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raise SystemExit
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class A:
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def __init__(self, value):
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self.value = value
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def meth(self):
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return self.value
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def meth_with_arg(self, a):
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return [self.value, a]
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# Register a class instance as the module "mod".
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sys.modules["mod"] = A(1)
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# Try importing it as a module.
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import mod
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print(mod.meth())
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print(mod.meth_with_arg(2))
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# Change the module.
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sys.modules["mod"] = A(3)
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# Try importing it using "from ... import".
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from mod import meth, meth_with_arg
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print(meth())
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print(meth_with_arg(4))
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