invalid syntax python print code example

Example 1: Python 3 invalid syntax with print()

print("hello")
var = 1
print(var)
var = io.input()
print(var)

Example 2: print("%.2F" S) ^ SyntaxError: invalid syntax

import math

A=float(input("A="))
H=float(input("H="))
C=float(input("C="))
D=float(input("D="))

S==(0.5*A*H)

P==(2*C+2*D)

E==P+S

print("%.2F" S)

print("%.2F" P)

print("%.2F" E)