Python Learning note Three--use of dictionaries

One. Basic use:

1. Assignment: {Key:value}

1.1 In the same place as the list: changes in the value associated with the index (key) are changed

1.2 Different from the list: regardless of the length of the value, and the list is ordered to consider the end of the offset, more than the end of the offset will be an error.

2. Len (dictionary): Returns the number of keys

Two. Method of the Dictionary:

1. Take out all values in the dictionary: Values ()

2. Remove all keys in the dictionary and their corresponding values: Iterm ()

3. Determine if a key exists in the dictionary: Get ()

4. Two dictionary merges: update ()

5. Delete a key in the dictionary and return the value corresponding to this key: Pop ()

Python Learning note Three--use of dictionaries