python 基础操作

字典级别目录（导航）

用递归方法进行级别导航，将字典中name: level_list的键值对找到，将目录级别放在text_list列表中。

此操作应用场景是在html里展示导航路径，如图：

 

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a_list = [     {         'text': "系统",         'icon': "fa-bed",         'children': [             {'text': "级别1",              'url': "/level/list/",              'children': [                  {                      'text': "级别2",                      'name': "level_list1"                  },                  {                      'text': "级别3",                      'name': "level_list3"                  }              ]},         ]     },     {         'text': "用户",         'icon': "fa-bed",         'children': [             {'text': "管理1",              'url': "/level/list/",              'children': [                  {                      'text': "管理1-1",                      'children': [                          {                              'text': "管理1-1-1",                              'children': [                                  {'text': "管理1-1-1-1", 'name': "level_list2"},                                  {'text': "管理1-1-1-2", 'name': "level_list5"}                              ]                            },                          {                              'text': "管理1-1-2",                              'children': [{                                  'text': "管理1-1-2-1",                                  'children': [                                      {                                          'text': '',                                          'name': "level_list"                                      }, {                                          'text': '',                                          'name': "level_list7"                                      },                                  ]                                }]                            }]                    }              ]},             {'text': "管理2",              'url': "/level/list/",              'children': [                  {                      'text': "管理2-1",                      'name': "level_list1"                  },                  {                      'text': "管理2-2",                      'name': "level_list3"                  }              ]},             {'text': "管理3",              'url': "/level/list/",              'children': [                  {'text': "管理3-1",                   'url': "/level/list/",                   'children': [                       {                           'text': "管理3-1-1",                           'name': "level_list1"                       },                       {                           'text': "管理3-1-2",                           'name': "level_list2"                       }                   ]                   },              ]},           ]     },   ]   text_list = []     def key_exists_in_nested_dict(nested_list, name='name', text='level_list'):     for nested_dict in nested_list:           if name in nested_dict:             if nested_dict[name] == text:                 return True  # text_list.append(nested_dict['text'])             # name 的value不是'level_list',判断是列表最后一个字典就将上个级别目录删除             elif nested_dict == nested_list[-1]:                 text_list.pop(-1)             continue         text_list.append(nested_dict['text'])         # 递归到进入下一级别         if key_exists_in_nested_dict(nested_dict['children'], name='name', text='level_list'):             return True         # 分支的情况，内部循环执行完后未退出，判断是children列表最后一个字典则删除上级别目录         elif len(text_list) and nested_dict == nested_list[-1]:             text_list.pop(-1)     # text_list.pop(-1)     #     for key, value in nested_dict['children'].items():     #         if isinstance(value, dict):     #             if key_exists_in_nested_dict(value, key_to_check):     #                 return True     return False     key_exists_in_nested_dict(a_list, name='name', text='level_list') print(text_list)

 

面向对象__str__，实例化直接输出

　　

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class Foo：     def __init__(self,name):         self.name=name     def __str__(self):         return self.name obj = Foo('ddd') print(obj)  # ddd

 

面向对象继承关系

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class BootStrapForm(object):     exclude_data_list = []       def __init__(self):         print(self.exclude_data_list)     class UserForm(BootStrapForm):     exclude_data_list = [11, 22, 33]     v1 = BootStrapForm()  # [] v2 = UserForm()  # [11, 22, 33] v3 = UserForm()  #

 

django页面插件

forms.ModelForm

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widget=forms.TextInput widget=forms.PasswordInput widget=forms.Select widget=forms.Textarea widget=forms.RadioSelect + CSS样式