Python Numbers

Python Numbers

There are three numeric types in Python:

• int - Integer (whole numbers, positive or negative, without decimals)
• float - Floating point number (contains decimals)
• complex - Complex numbers

Integer (int)

Int, or integer, is a whole number, positive or negative, without decimals, of unlimited length:

x = 1
y = 35656222554887711
z = -3255522

print(type(x))  # <class 'int'>
print(type(y))  # <class 'int'>
print(type(z))  # <class 'int'>

Float

Float, or "floating point number" is a number, positive or negative, containing one or more decimals:

x = 1.10
y = 1.0
z = -35.59

print(type(x))  # <class 'float'>

Complex

Complex numbers are written with a "j" as the imaginary part:

x = 3+5j
y = 5j
z = -5j

print(type(x))  # <class 'complex'>

Type Conversion

You can convert from one type to another with the int(), float(), and complex() methods:

x = 1    # int
y = 2.8  # float
z = 1j   # complex

# Convert from int to float
a = float(x)

# Convert from float to int
b = int(y)

# Convert from int to complex
c = complex(x)

print(a)  # 1.0
print(b)  # 2
print(c)  # (1+0j)