关于Python中compile() 函数简单实用示例详解

from code.cal import add,mul
from code.sqrt import sqrt
__all__ =[ "add","mul","sqrt"]

def add(a,b):
	return a+b
def mul(a,b):
	return a*b

def sqrt(a):
	return a**2

import traceback
import os
import requests
import threading
import time
import json
import logging
log=logging.getLogger()
def compile_funcs(codefile,funname_list):
    """
    Args:
        codefile: Path of Python's Code file
        funname_list: list of function names
    Return: dict of func info     
    """
    try:
    	#读取代码
        with open(codefile) as f:
            code=f.read()
        #将字符串编译为字节代码
        methods_obj=compile(code,"","exec")
        scope = {}
        '''
        exec函数族的作用是根据指定的文件名找到可执行文件，并用它来取代调用进程的内容;
        换句话说，就是在调用进程内部执行一个可执行文件。这里的可执行文件既可以是二进制文件，
        也可以是任何Linux下可执行的脚本文件
        '''
        exec(methods_obj,scope)
        fun_object={}
        for name in funname_list:
            fun_obj= scope.get(name,None)
            fun_object[name] = fun_obj
        return fun_object
    except Exception as e:
        traceback.print_exc(e)
        return None
#函数名称
func_lists=['add','mul','sqrt']
#传入code下的demo.py
func_dict= compile_funcs("./code/demo.py",func_lists)
#获取返回对象
add = func_dict['add']
mul = func_dict['mul']
sqrt = func_dict['sqrt']
#传参调用
c = add(2,3)
d = mul(3,3)
e = sqrt(5)
print(f"add(2,3)={c}")
print(f"mul(3,3)={d}")
print(f"sqrt(5)={e}")