Flow control statement in Python

If and else statement in Python

If we need to add some conditional statement then we will use if, else conditions.

x = 10
y = 20

if(x < y ):
   print("y is greater")

// if and else statement


if(x < y ):
   print("y is greater")
else:
   print("x is greater")


// if statement with tuple
tup1 = ('a', 'b', 'c')
if('a' in tup1):
  print("a is present in tuple")
else:
  print("a is not present in tuple")

//if with list

li = [1,2,3]
if(li[1] == 2):
   print(2 is present)
else:
   print(2 is not present)

// if with dictionary 
d = {'apple':10, 'mango': 20, 'kiwi': 30}
if(d['mango'] > 25)
   print("Mango price is less then 25")

Loops in Python

While Loop

While loop executes statement repeatedly until condition is true.

i = 1
while i < 10
   print(i)
   i = i + 1

Output: 1 2 3 4 5 6 7 8 9 10

For Loop

For loop iterate our sequence. Sequence is a list, tuple, dictionary. For is the basic keyword like other programming language.

// Syntax for For loop

for val in sequence:

    //body

color_list = ['green', 'yellow', 'red']
for color in color_list
    print(color)     

Output: green
        yellow
        red

Nested For Loop

Nested loop means one loop inside another loop

// Syntax for Nested loop

for val in sequence1:
    for val in sequence2:
        //body


color_list = ['green', 'yellow', 'red']
fruit_list  = ['Shirt', 'Paint', 'Top']

for val1 in color_list:
    for val2 in fruit_list:
        print(val1, val2)

Output: 

green Shirt
green Paint
green Top
yellow Shirt
yellow Paint
yellow Top
red Shirt
red Paint
red Top