Data structure of the Python Language 2 (dictionary, reference)

1. Dictionaries

Key-value pairs.

1dict={"Key1":"value1",2        "Key2":"value2"3      }4 5 #add a new key/value pair6dict["Key3"] ="Value3"7 8 #Change a Key/value pair9dict["Key2"] ="NewValue"Ten  One #Delete a key/value pair A deldict["Key1"] -  -  forKey,valueinchDict.items (): the    Print("%s:%s"%(key,value)) -  - if "Key2" inchdict: -     Print("Find Key2")

2. References

When initializing object A with a complex object B, A is just a reference to B! A and B point to the same piece of memory.

If you want to copy object B to object A, you must use the slice operator to get the copy .

Data structure of the Python Language 2 (dictionary, reference)