x = 20
y = x * x
print(x,y)
x = x + 10
print(x)

20 400
30

x = 45
y = 2
print(x/y)
print(x//y)
print(x%y)
print(2*x+3*y)

22.5
22
1
96

s = "This is a string"
t = "Hello"
print(len(s))
print(len(t))

16
5

print(s[5])

i

print(s[2:8])

is is 

print(s+t)

This is a stringHello

print(s[2:8]+"x")

is is x