mirror of
https://github.com/pocketpy/pocketpy
synced 2025-10-20 19:40:18 +00:00
45 lines
1006 B
Markdown
45 lines
1006 B
Markdown
---
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icon: dot
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label: 'Call Python function'
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order: 70
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---
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pkpy uses a variant of the [Vectorcall](https://peps.python.org/pep-0590/) protocol (PEP 590).
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You can use `call` to invoke any python callable object,
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including functions, methods, classes, etc.
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For methods, `call_method` can be used.
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+ `PyObject* call(PyObject* obj, ...)`
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+ `PyObject* call_method(PyObject* obj, StrName name, ...)`
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### Exmaple
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Let's create a `dict` object and set a key-value pair,
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which equals to the following python snippet.
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```python
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obj = {} # declare a `dict`
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obj["a"] = 5 # set a key-value pair
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print(obj["a"]) # print the value
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```
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First, create an empty dict object,
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```cpp
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PyObject* tp = vm->builtins->attr("dict");
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PyObject* obj = vm->call(tp); // this is a `dict`
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```
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And set a key-value pair,
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```cpp
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vm->call_method(obj, "__setitem__", VAR("a"), VAR(5));
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```
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And get the value,
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```cpp
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PyObject* ret = vm->call_method(obj, "__getitem__", VAR("a"));
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std::cout << CAST(i64, ret) << std::endl;
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``` |