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Comments in Python start with the hash character, "#"

Complex numbers are also supported; imaginary numbers are written with a suffix of "j" or "J". Complex numbers with a nonzero real component are written as "(real+imagj)", or can be created with the "complex(real, imag)" function.

>>> 1j * 1J

(-1+0j)

>>> 1j * complex(0,1)

(-1+0j)

>>> 3+1j*3

(3+3j)

>>> (3+1j)*3

(9+3j)

>>> (1+2j)/(1+1j)

(1.5+0.5j)

Complex numbers are always represented as two floating point numbers, the real and imaginary part. To extract these parts from a complex number z, use z.real and z.imag.

>>> a=1.5+0.5j

>>> a.real

1.5

>>> a.imag

0.5

In interactive mode, the last printed expression is assigned to the variable _. This means that when you are using Python as a desk calculator, it is somewhat easier to continue calculations, for example: