Data Types

Built-in types

Python has several built-in data types: str (text), int (whole numbers), float (decimals), bool (True/False), list, tuple, dict, set, and None.

print(type("hello"))   # <class 'str'>
print(type(42))        # <class 'int'>
print(type(3.14))      # <class 'float'>
print(type(True))      # <class 'bool'>

Type conversion

Convert between types with int(), float(), str(), bool().

x = "42"
y = int(x)      # 42 as integer
z = float(x)    # 42.0
print(y + 1)    # 43

Try it yourself

Run the example below. Edit it and see what changes.

x = 10
print(type(x))
print(type("hello"))
print(type(3.14))
 

Common mistakes

• ⚠Confusing str '42' with int 42 — they behave differently with +.
• ⚠Forgetting that True equals 1 and False equals 0.