Python Dynamic Call function

1. Dynamically invoke methods within a Python file based on string name eval ("Function_name") (parameter)

2. Dynamic invocation of a static method in a class based on a string, GetAttr (ClassName, "function_name") (parameter)

3. Apply (Functoin_name,parameters) This function_name is not a string, but a function object itself; Parameters is a parameter, similar (a, B,...) Such a format

4. When the function is unsure of the number of arguments, take a * or two * * their usage is fastidious. http://blog.csdn.net/feisan/article/details/1729905

The following example defines a dictionary of function lists, a dictionary that holds parameters for function objects and functions, which can be used to dynamically add functions to the dictionary, and finally execute

From collections import Ordereddictclass componentcheck:def __init__ (self, data_dir): Self.data_dir = Data_dir Self._extend_function_dic = Ordereddict ({}) def add_extend_function (self, function_name, *parameters): SE Lf._extend_function_dic[function_name] = Parameters def _check_extend_function (self): for function_name, Paramet ERs in Self._extend_function_dic.iteritems (): If not apply (function_name, parameters): Return Fa LSE return TRUECLASS Checkfunctions:def __init__ (self): Pass def Tollcost_check (Data_path): To Ll_cost_path = Os.path.join (Data_path, importer.dt_kor_toll_cost) tollcost_component = Componentcheck (toll_cost_pat h) tollcost_component.add_extend_function (Tollcost_component.check_file_pattern_list_match, CheckFunctions.TOLL_ Cost_filename_pattern) return Tollcost_component@staticmethod def speed_camera_check (data_path): Speed_ca Mera_path = Os.path.join (daTa_path, Importer.dt_safety_camera) speed_camera_component = Componentcheck (Speed_camera_path) Speed_camera_ Component.add_extend_function (speed_camera_component.check_not_exist_empty_directory) return Speed_camera_ Component

　　

Python Dynamic Call function