python 基础 字典 增删改查

content = {"name":"wd","pc":{"phone":111111,"age":18},"woniu":["122222",18]}

• 增

• content['kk'] = 'test'

• 删

  content.pop("kk")         注意 列表有序，可以直接pop()

• 改

• content['name'] = 'lll'    直接对字符串内容赋值
• content['woniu'][0] = '33333'    列表赋值
• content['pc']['age'] = 20     字典赋值

• 查

• len（conent）

• content.keys()
• content.values()
• content.items()

• content.items()
  Out[11]:
  [('pc', {'age': 18, 'phone': 111111}),
  ('woniu', ['122222', 18]),
  ('name', 'wd')]

• content.get("ndjandjs",'name')     如果ndjandjs不存在则使用name    返回值为true 和false
• content.has_key("name")

• 循环

• content = {'name':'lyz','pc':[1,2,3],'woniu':{'age':31,'job':'IT'}}
  for k,v in content.items():
      print k+":"
      if isinstance(v,dict):
          for a,b in v.items():
              print a,b
      elif isinstance(v,list):
          for c in v:
              print c
      else:
          print v

  content = {'name':'lyz','pc':[1,2,3],'woniu':{'age':31,'job':'IT'}}
  for k,v in content.items():
      print k+":"
      if type(v) is dict:
          for a,b in v.items():
              print a,b
      elif type(v) is list:
          for c in v:
              print c
      else:
          print v