https://github.com/flipeador/cpp20-and-python-c-api
C++20 and Python/C API: Using Python from C++20.
https://github.com/flipeador/cpp20-and-python-c-api
cpp cpp20 python python3 pythoncapi visual-studio visual-studio-2019
Last synced: 7 months ago
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C++20 and Python/C API: Using Python from C++20.
- Host: GitHub
- URL: https://github.com/flipeador/cpp20-and-python-c-api
- Owner: flipeador
- Created: 2021-06-22T14:47:12.000Z (over 4 years ago)
- Default Branch: main
- Last Pushed: 2021-06-22T15:10:52.000Z (over 4 years ago)
- Last Synced: 2025-01-14T12:53:14.453Z (9 months ago)
- Topics: cpp, cpp20, python, python3, pythoncapi, visual-studio, visual-studio-2019
- Language: C++
- Homepage:
- Size: 12.7 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# CPP20-and-Python-C-API
C++20 and Python/C API.
Requires: Python 3.
`C:\Program Files\Python\include`
`C:\Program Files\Python\libs`
## Example
### consoleapp.cpp
```cpp
#include "python.h"
#include
using namespace std;
PyObject* f_hello_world(PyObject* pdata, PyObject* pargs, PyObject* pkwargs)
{
Py_KwArgsFromCFunc(pargs, pkwargs);
string hello = Py_GetItemStr(args, 0); // 'hello'
string world = Py_GetItemStr(args, 1); // 'world'
string end = Py_GetItemStr(args, 2); // '!'
string space = Py_GetValueStr(kwargs, "space"); // ' '
return Py::Str(hello + space + world + end)
.AddRef();
};
int main()
{
Py::Initialize();
// Load module 'main.py'.
Py::Module mod("main");
// Generate 1000 digits of Pi.
Py::Callable pi_digits_str = mod.GetAttr("pi_digits_str");
Py::Str result = pi_digits_str(Py::Int(1000l));
cout << result.GetUTF8() << endl;
cout << endl;
// Print *args and **kwargs.
Py::Callable print_args = mod.GetAttr("print_args");
print_args(
Py::Tuple::FromValues(
Py::Str("value #1"),
Py::Str("value #2")
),
Py::Dict::FromValues(
Py::Str("key #1"), Py::Int(256l),
Py::Str("key #2"), Py::Float(3.14)
)
);
cout << endl;
// Print 'Hello World!'.
Py::Callable hello_world = mod.GetAttr("hello_world");
Py::Str hello_world_str = hello_world(Py::Callable(f_hello_world));
cout << hello_world_str.GetUTF8() << endl;
return 0;
}
```
### main.py
```py3
def pi_digits(n):
"""
Generate n digits of Pi.
https://gist.github.com/deeplook/4947835
"""
k, a, b, a1, b1 = 2, 4, 1, 12, 4
while n > 0:
p, q, k = k * k, 2 * k + 1, k + 1
a, b, a1, b1 = a1, b1, p * a + q * a1, p * b + q * b1
d, d1 = a / b, a1 / b1
while d == d1 and n > 0:
yield int(d)
n -= 1
a, a1 = 10 * (a % b), 10 * (a1 % b1)
d, d1 = a / b, a1 / b1
def pi_digits_str(n):
digits = [str(n) for n in list(pi_digits(n))]
return '{}.{}'.format(
digits.pop(0),
''.join(digits)
)
def print_args(*args, **kwargs):
print('\n'.join(args))
for key, value in kwargs.items():
print(f'{key}={value}')
def hello_world(f_hello_world):
return f_hello_world('Hello', 'World', '!', space=' ')
```