1. 根据字符串名称 动态调用 python文件内的方法eval("function_name")(参数)
2. 根据字符串 动态调用类中的静态方法,getattr(ClassName,"function_name")(参数)
3. apply(functoin_name,parameters) 这个function_name不是字符串,而是函数对象本身;parameters是参数,类似(a,b,...)这样的格式
4. 当函数不确定参数的数目时候,采用 一个 * 或两个** 他们的用法是有讲究的。http://blog.csdn.net/feisan/article/details/1729905
下面的例子是,定义了一个函数列表字典,字典中保存有函数对象和函数的参数,可以实现动态为字典添加执行的函数,最后一起执行
from collections import OrderedDict class ComponentCheck: def __init__(self, data_dir): self.data_dir = data_dir self._extend_function_dic = OrderedDict({}) def add_extend_function(self, function_name, *parameters): self._extend_function_dic[function_name] = parameters def _check_extend_function(self): for function_name, parameters in self._extend_function_dic.iteritems(): if not apply(function_name, parameters): return False return True class CheckFunctions: def __init__(self): pass def tollcost_check(data_path): toll_cost_path = os.path.join(data_path, Importer.DT_KOR_TOLL_COST) tollcost_component = ComponentCheck(toll_cost_path) 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_camera_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
原文:http://www.cnblogs.com/dasheng-maritime/p/7833658.html