Python Learning: list, tuple, and dict

List: Lists, data types can be different

Definition: (example) classmates = [' Michael ', ' Bob ', ' Tracy ']

Access to an element: (example) classmates[0] means access to the first element (example) classmates[-1] means access to the last element

Get list Length: (example) Len (classmates)

Append elements: (example) classmates.append (' Adam ')

Insert element to specified position: (example) Classmates.insert (1, ' Jack ')

Delete End element: (example) Classmates.pop ()

Delete the specified element: (example) Classmates.pop (1)

Replace the specified element: (example) classmates[1] = ' Sarah '

Two-dimensional list: (example) p = [' asp ', ' php ']

s = [' Python ', ' Java ', p, ' scheme ']

S[2][1] is ' php '

Tuple: Tuples, once initialized cannot be modified

Define an empty tuple: (example) T = ()

Define a single element tuple: (example) T = (1,) (in order to differentiate between expressions (1) and tuple (1))

"Mutable" tuple: (example) t = (' A ', ' B ', [' A ', ' B ']) (description: The contents of a tuple are not mutable, but the contents of the list can be changed)

Dict: Dictionary, key-value mapping store, very fast lookup speed

Python Learning: list, tuple, and dict