# 0117.py

import cmath

z=4+3j

print (cmath.polar(z))
# (5.0, 0.64350110879328437)

print (abs(z)) # Senza il prefisso cmath.
# 5.0

print (math.atan(3/4))
# 0.643501108793
print (cmath.phase(z))
# 0.643501108793

print (cmath.rect(5,0.64))
# (4.01047878942+2.98597720681j)