Вещественные и комплексные числа

1.2.1.py

# -*- encoding: utf-8 -*-
"""
Неявное преобразование целых в вещественные
"""

a = 3                     # name created
b = 4

print 2 + 4.0, 2.0 ** b   # mixed-type conversions

1.2.2.py

# -*- encoding: utf-8 -*-
"""
Явное преобразование целых в вещественные
"""

a = 3
b = 4

print b / (2.0 + a)   # same as (4 / (2.0 + 3))

1.2.3.py

# -*- encoding: utf-8 -*-
"""
Комплексные числа
"""

#Complex numbers with a nonzero real component are written as "(real+imagj)", 
#or can be created with the "complex(real, imag)" function.

print 1j * 1J

print 1j * complex(0,1)

print 3+1j*3

print (3+1j)*3

print (1+2j)/(1+1j)

1.2.4.py

# -*- encoding: utf-8 -*-
"""
Конвертация комплексных в вещественные
"""

#The conversion functions to floating point and integer 
#(float(), int() and long()) don't work for complex numbers 

a=3.0+4.0j

print a.real

print a.imag

print abs(a)  # sqrt(a.real**2 + a.imag**2)