import lib_module

def update():
    import importlib
    importlib.reload(lib_module)
    del importlib
def change_my_lib():
    with open("lib_module.py", "w") as libby:
        libby.write("def func_in_lib():\n\tprint('new logic!')\n")
 
def reset_project_demo():
   with open("lib_module.py", "w") as libby:
        libby.write("def func_in_lib():\n\tprint('Old logic :(')\n")
      
if __name__ == '__main__':
    lib_module.func_in_lib()
    change_my_lib()
    lib_module.func_in_lib()
    # Notice the logic doesn't change till we update it. '
    update()
    lib_module.func_in_lib()
    # Look, now we performed a hot reload of a library without turning off the program
    # It should be obvious where this can be useful. 
    reset_project_demo()