6.3. C module variable parameters

[Note]

• Requires kernel version >= v1.10.0

• Variable arguments must be placed after positional arguments

Example.

// test.c
void test_vals(PikaObj* self, int a, PikaTuple* val){
    printf("a: %d\n", a);
    for(int i =0; i< tuple_getSize(val); i++){
        Arg* arg_i = tuple_getArg(val, i);
        printf("val[%d]: %d\n", i, arg_getInt(arg_i));
    }
}

Output the result:

>>> test.vals(1, 2, 3, 4)
a: 1
val[0]: 2
val[1]: 3
>>>

6.4. C module keyword parameters

[Note]

• Requires kernel version >= v1.10.7

• Keyword arguments must be placed after positional and variable arguments

Example.

# test.pyi
def keys(a:int, **keys):...

Output result:

>>> test.keys(1, b=2, c=3)
a: 1
keys['b']: 2
keys['c']: 3
>>>

6.5. C module constants

class cJSON:
    cJSON_Invalid: int
    cJSON_False: int
    def __init__(self):...
    ...

void pika_cjson_cJSON___init__(PikaObj* self) {
    obj_setInt(self, "cJSON_False", cJSON_False);
    ...
}

These constants can be used directly without creating an object, i.e. as class properties.

Note that PikaScript class properties are read-only, and all modifications to class properties are invalid.

6.6. C module initialization

Define __init__() function directly in .pyi to perform module initialization, which will be triggered when the module is loaded, PikaScript has a delayed module loading mechanism, import will not trigger module loading directly, but only when the module is actually used for the first time.

For example:

# test.pyi
def __init__():...
def hello():...

//test.c
void test___init__(PikaObj* self){
    printf("now loading module test...\n");
}
void test_hello(PikaObj* self){
    printf("hello!\n");
};

# main.py
import test
print('before run test.hello()')
print('after run test.hello()')

Output.