字典方法

1.字典
  user = {"name": "cos", "age": 18, "sex": "Man"}
  # 索引
  # print (user["name"])
  # 字典不能分片
  # 循环，默认输出key
  for i in user:
      print (i)

  # 删除
  del user["name"]
  print (user)

2.clear 清除字典中所有的项

  user = {"name": "cos", "age": 18, "sex": "Man"}
  user.clear()
  print (user)

3.get 根据Key获取值

  user = {"name": "cos", "age": 18, "sex": "Man"}
  print (user.get("age"))

4.has_key 检查字典中是否有特定的键 （ps:在python3.0以后没有has_key)

  user = {"name": "cos", "age": 18, "sex": "Man"}
  print (user.has_key("age"))

5.keys、values、items

  user = {"name": "cos", "age": 18, "sex": "Man"}
  # 获取键Key
  print (user.keys())
  # 获取值
  print (user.values())
  #获取键值
  print (user.items())

6.pop 获取给定Key的值，然后将这个键值删除

  user = {"name": "cos", "age": 18, "sex": "Man"}
  print (user.pop("name"))
  print (user)

7.popitem 随机获取字典的键值，并删除它

  user = {"name": "cos", "age": 18, "sex": "Man"}
  print (user.popitem())
  print (user)

8.update 利用一个字典更新另一个字典，若Key键相同，则直接覆盖，不同就添加

  user = {"name": "cos", "age": 18, "sex": "Man"}
  n = {"name": "sin"}
  user.update(n)
  print (user)

字典方法

原文：http://www.cnblogs.com/keshanyong/p/5924521.html