Complex numbers have a real and an imaginary part, each represented by a floating point number.
The imaginary part of a complex number can be created using an imaginary literal, this results in a complex number with a real part of 0.0 :
>>> a = 3.5j
>>> type(a)
<class 'complex'>
>>> print(a)
3.5j
>>> a.real
0.0
>>> a.imag
3.5
No literal exists for creating a complex number with non-zero real and imaginary parts. To create a non-zero real part complex number, add an imaginary literal to a floating point number:
>>> a = 1.1 + 3.5j
>>> type(a)
<class 'complex'>
>>> print(a)
(1.1+3.5j)
>>> a.real
1.1
>>> a.imag
3.5
Or use the complex constructor.
class complex([real[, imag]])
The arguments used to call the complex constructor can be of numeric (including complex ) type for either parameter:
>>> complex(1, 1)
(1+1j)
>>> complex(1j, 1j)
(-1+1j)
>>> complex(1.1, 3.5)
(1.1+3.5j)
>>> complex(1.1)
(1.1+0j)
>>> complex(0, 3.5)
3.5j
A string can also be used as the argument. No second argument is allowed if a string is used as an argument
>>> complex("1.1+3.5j")
(1.1+3.5j)
We can obtain the absolute value of a complex number using the abs() method in python.
>>> a=2+3j
>>> abs(a)
3.605551275463989
>>> b=-1+1j
>>> abs(b)
1.4142135623730951