python--Ganso and dictionaries

One, 1: ganso: Tuple in Python, Ganso is also a list, and the difference between it and list is that the elements in the list can be modified, and the elements in the meta-ancestor cannot be modified.

2: Definition of Ganso: with parentheses ()

Second, 1. Dictionary dictionary full Dictionary, Dictionary is the advantage of dictionary in the Key-value format: Find elements fast,

2. Dictionary definition: using {} to define dictionary dictionaries is defined in key:value way.

3. The operation of the dictionary increased, deleted, changed, checked

1. Increase

2. Delete Pop () method, Popitem () method, Del () method

3. Clear the Dictionary clear () method

4 modifications

5. Check

Third, the circular traversal of the dictionary

Iv. other methods of the dictionary

Get all keys in the dictionary

Get all values in the dictionary

Gets the dictionary all key value

python--Ganso and dictionaries