Basic Python

print("Hello World")

a = 3
b = 5
c = a + b
print(a, b, c)

# Python string formatting for output
print("a = {0}".format(a))
print("a = {0}; b = {1}; c = {2}".format(a, b, c))

# Python basic math operations
# Division
print(13 / 2)   #Regular division
print(13 // 2)  #Integer division
print(13 % 2)   #Modulus division, remainder of the division
print(2 ** 4)   #Exponent operation, 2 to the power of 4
​​

# Python strings
s = "food"
print(s)
print(s[0])
print(s[1])
print(len(s))
print(s[0:2])
print(s[2:0:-1])  #print a slice of string in reverse order

# Python math package
import math
print(math.pi)
print(math.sqrt(2))

# Python list
l = [1,2,3,4,5,6]
print(l)
long_l = [l, 7, 8, 9, 10]
print(long_l)
print(l * 2)  # repeat the list in multiple times
print(l[2:5])

# Python tuples
# The difference between lists and tuples
# Lists are mutable (changable)
# Tuples are immutable (unchangable)
t = (1,2,3,4,5,6)
print(t)
l[0] = 100
print(l)
# t(0) = 100   # will throw an exception because you can't change tuple

#if statements​
num = 10
if num > 20:
    print("The number is greater 20")
else:
    print("The number is less than or equal to 20")

num = 14
if num % 2 == 1:
    print("{0} is an odd number".format(num))
else:
    print("{0} is an even number".format(num))

# Python if-else expression (iif)
result = "even number" if num % 2 == 0 else "odd number"
print(result)

# Python for loop
for n in range(1,11):  # Be careful, the ending number is not included
    print(n)

a = [1,2,3,4,5,6]
b = 8

result = False
for num in a:
    if num == b:
        result = True

print(result)
print("a is in b" if result else "a is not in b")