def f(x):
    answer = x*x + 2*x + 1
    #answer = x**2 + 2*x + 1
    return answer

#print(f(5))
#print(f(6))
u = f(5)
v = f(6)
#print(u+v)

36
49
85

x = 22
if x % 2 == 0:
    print("even")

even

x = 22
if x % 2 == 0:
    print("even")
else:
    print("odd")

even

grade = 65
if grade > 100 or grade < 0:
    print("Invalid grade")
elif grade >= 90:
    print("A")
elif grade >= 80:
    print("B")
elif grade >= 70:
    print("C")
elif grade >= 60:
    print("D")
else:
    print("F")

x = 20
print(x)
x = "Hello"
print(x)

20
Hello

# Collection types
# list, tuple, set, dictionary
a = [1, 2, 3, 4, 5]
print(a)
print(a[-5])
print(a[4])
a[0] = 100
print(a)
print(len(a))

[1, 2, 3, 4, 5]
1
5
[100, 2, 3, 4, 5]
5

a = [10,20,30,40,50]
for item in a:
    print(item) # item is a variable   

10
20
30
40
50

list(range(10))

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

import math
math.sin(math.radians(90))

1.0