Python - Data Types

Data types are the kinds of data that you can store.

Built-in Data Types

• string - A string of characters;
  'im globglogabgalab' "i love books"
• int, float, complex - numbers, integers, float (numbers with decimal-point) and complex;
  77 3.14 1j
• boolean - true or false;
  True False
• list, tuple, range - list of values, tuple and range (used in loops);
  [1, 'hi!', false] (1, 'hi!', false) range(0,10,2)
• dict - key/value;
  {((name = "The rock"), (strength = 999))}
• set, frozenset - list with unique values and unordered values;
  {("apple", "orange", "pineapple")}
• none - null, none, nothing, empty and etc...
  None

List vs Tuple

The main difference is that lists can be changed (mutable), while tuples cannot (immutable).

my_list = [1, 2, 3]
my_tuple = (1, 2, 3)

my_list[1] = 4 # <- Ok!
my_tuple[1] = 4 # <- Error!

Set vs FrozenSet

The main difference is that a set is mutable (can be changed), while a frozenset is immutable (cannot be changed).

x = { "a", "b", "c" }
y = frozenset(x)

x.add("d") # <- Ok!
y.add("d") # <- Error!

What is the 'range' data type?

The range data type is simply used in for-loops.

for n in range(10):
  print(n)

What is 'Iterables'?

any sequence that can be iterated over, such as:

• list
• tuple
• dictionary
• set