Python course: Numbers

In Python, numbers can be represented as three different types:

Int

Short for "integer". This type is used to represent whole numbers. Being positive, negative, or zero.

a = 5
b = 123456789101112
c = -45
d = 0

# Use type(<some_variable>) to return the type of a variable:

print(type(a)) # => <class 'int'>
print(type(b)) # => <class 'int'>
print(type(c)) # => <class 'int'>
print(type(d)) # => <class 'int'>

Float

Also can be positive, negative or zero. It's used to represent decimal numbers. Floats can also be used to represent scientific notation, adopting "e" to indicate the power of 10.

a = 1.50
b = 0.0
c = -48.68
d = 4e3 # scientific notation, equals to 4000.0 
e = 4e-3 # scientific notation, equals to 0.004

print(type(a)) # => <class 'float'> 
print(type(b)) # => <class 'float'> 
print(type(c)) # => <class 'float'> 
print(type(d)) # => <class 'float'> 
print(type(e)) # => <class 'float'>

Complex

A "complex" is a number with a real and an imaginary part, where the imaginary part is a multiple of the imaginary unit "j".

a = 3 + 5j 
b = 5j
c = -5j

print(type(a)) # => <class 'complex'> 
print(type(b)) # => <class 'complex'> 
print(type(c)) # => <class 'complex'>

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