Loop in Python | Shraddha Khapra #Lec 05

 # Loops in python
# loops are used to repeate instructions
# while loop
# for loop
# while loop
""" while True:
    print("hello") """     #print hello infinite times
"""
count = 1
while(count <= 3):
    print("hello everyone")
    count += 1
print("your loop is ended","your count value is :",count)
"""
"""
i = 1
while(i <= 10):
    print("while loop")
    i += 1
"""
#we can print count value also
"""
i= 1
while(i <= 100):
    print("this is count value : ", i)
    i += 1
"""
# print numbers
"""
num  =1
while(num <=10):
    print(num)
    num +=1
"""
# print loop reverse
"""
num = 5
while(num >= 0):
    print(num)
    num -=1
"""
"""
i = 100
while(i >= 1):
    print(i)
    i -= 1"
"""
"""
count =99900
while(count >= 1):
    print(count)
    count -= 1
"""
# Lets practice
# print number 1 to 100
"""
num =1
while (num <= 100):
    print(num)
    num += 1
"""
# print numbers 100 t0 1
"""
count = 100
while(count >= 1):
    print(count)
    count -= 1
"""
#print factorialtiplication table of number n
"""
count = 1
number = int(input("enter a value :"))
while(count <= 10):
    print(count*number)
    count += 1
"""
"""
count =1
number = int(input("enter a value : "))
while(count <= 30):
    print (count*number)
    count +=1
print("loop has been ended")
"""
#print element of following list using a loop
"""
lest = [1,4,9,16,25,36,49,64,81,100]
count = 1
while(count <= 10):
    print(count*count)
    count +=1
"""
#traverse : traveling on each index or variable
"""
lest = [1,4,9,16,25,36,49,64,81,100]
idx = 0
while(idx < len(lest)):
    print(lest[idx])
    idx +=1
"""
"""
heros = ["batman","iron man","superman","wanda","black vidow"]
idx = 0
while(idx < len(heros)):
    print(heros[idx])
    idx += 1
"""
"""
disney_movies = ["ratatouile","the good dianosaur","beauty and the beast","moana","ice age"]
idx = 0
while(idx < len(disney_movies)):
    print(disney_movies[idx])
    idx += 1
"""
#search for a number x in this tuple using loop
"""
num = [1,4,9,16,25,36,49,64,81,100]
idx = 0
user = 100
while(idx < len(num)):
    if(num[idx] == user):
        print("found it at index : " ,idx)
    idx += 1
print("loop has been ended")
"""
"""
number = [1,4,9,16,25,36,49,64,81,100]
user = int(input ("enter a number to find out : "))
index = 0
while(index < len(number)):
    if(number[index] == user):
        print("number found at index", index)
        break
    else:
        print("finding ........")
    index += 1
"""
"""
let = "asadshamsuddin"
count = 0
while(count < len(let)):
    print("the digit on index",count,let[count])
    count += 1
"""
# break and continue in while loop
# break : used to terminate or stop the loop
"""
i= 1
while(i<= 5):
    print(i)
    if (i==3):
        break
    i += 1
"""
# continue : terminates execution in the current itteration & coninues execution of the loop with the next itteration
"""
i = 1
while(i<=5):
    if(i == 3):
        i+=1
        continue
    print(i)
    i +=1
"""
"""
i = 1
while(i<=5):
    if(i == 2):
        i +=1
        continue
    print(i)
    i += 1
"""
"""
i = 0
while(i<=5):
    if(i == 4):
        i +=1
        continue    #skip the next code
    print(i)
    i += 1
"""
"""
disney_movies = ["ratatouile","the good dianosaur","beauty and the beast","moana","ice age"]
idx = 1
string = "the good dianosaur"
while(idx <len(disney_movies)):
    if(disney_movies[idx] == string):
        print("found it at index",idx)
        break
    else:
        print("not found")
    idx +=1
"""
# print even or odd numbers using break and continue
i = 0
while(i<=6):
    if(i %2 != 0):
        i += 1
        continue
    print(i)
    i += 1
# For loop in python
# for loop used for sequential traversal,for traversing list,string,tuple or ect
a = [1,2,3,4,5,9]
for val in a:
    print(val)
# on lists
str1 = ["patato","tomato","lady","finger"]
for sr in str1:
    print(sr)
# on tupple
tup = (34,78,9,55,34)
for val in tup:
    print(val)
#else in for loop (optional usage)
"""
str2 = "asadshamsuddin"
for character in str2:
    if(character  == "u"):
        print("u found")
        break
    print(character)
else:       #execute then when loop will complete
    print("end")
"""

# using for loop to solve problem

# print the element of the following list using a loop

num = [1,4,9,16,25,36,49,64,81,100]

for val in num:

    print(val)

#search for a number x in this tuple using loop

val2 = (1,4,9,16,25,36,49,36,64,81,100)

num = 36

for el in val2:

    if(num == el):

        print("found")

        continue

    else:

        print("not found yet")

   

# Range : important function while using range

# range function returns a sequence of number,starting from 0 by default and increment by 1(by default),and stop before a specified number

# range(start?,stop,step?)

for el in range(5):

    print(el)

for el in range (0,5):

    print(el)

for el in range (0,10,2):

    print(el)

# Lets practice

# print numbers from 1 to 100

for i in range(0,101):

    print(i)

# print numbers from 1 to 100

for i in range(100,0,-1):

    print(i)

# print the factorialtiplication table of n

num = 7

for i in range(1,11):

    factorial = num*i

    print(factorial)

# Pass statment

# pass is a null statment that does nothing. it is used as a placeholder for future code

#  if we want to do nothing in loop

for el in range (10):

    pass

# we can also use it if else statments

# Lets practice

# WAP to find the sum of first n numbers.(using while )

i=1

sum = 0

while(i<=10):

    sum = sum + i

    print(sum)

    i +=1

print("programm ends here")

#WAP to find factorial of first n numbers (using for )

factorial = 1

for el in range(1,11):

    factorial*=el

    print(factorial)

print("we have done this lecture")