Four Basic Data Structures

Four Basic Data Structures

1. Lists

   • [...,...,...]
     • myList = ["lemon", "banana", True, 2, 12]
       • includes Strings, boolean, and integers
       • there are 4 indexes: 0,1,2,3
   • appendable/changeable
     • Add or Remove elements from the list
       • myList.append
       • myLIst.remove("lemon")

2. Dictionaries

   • key:value
     • carOnSale = { "brand": "Toyoya", "model": "Corolla", "year": 2018, "sold": True
     • access elements
       • print(carOnSale)
       • carOnSale["color"] = "silver"
       • theBrand = carOnSale["brand"]
   • describe items; used to store data

3. Tuples

   • unchangeable
     • cannot add or remove elements
   • myTuple = ("meow", 32, False, "silly")
     • (...,...,...)

4. Sets

   • unordered and rejects duplicates
     • to check if an element exists
       • Loop:
         • for x in mySet: print(x)
       • True or False
         • print("banana" in mySet
   • {...,...,...}
     • mySet = {"lemon", "banana", False, 2}
   • add elements
     • mySet.add("apple")
   • merge to Sets
     • mySet.update(newSet)

5. ordered and allows duplicates (both Tuples and Lists)

   • to access an element
     • item = myList[2]
   • to access an element
     • item= myTuple[1]
       • returns "32"
     • myTuple[-1]
       • returns last item "False"
     • myTuple[1:3]
       • returns index 1 AND 2 AND 3 32, False, "silly"