For Loop in Python (Practice Problem) – Python Tutorial

# between 0 to 10
# there are 11 numbers
# therefore, we set the value
# of n to 11
n = 11
 
# since for loop starts with
# the zero indexes we need to skip it and
# start the loop from the first index
for i in range(1,n):
        print(i)

# if the given range is 10
given_range = 10
 
for i in range(given_range):
 
        # if number is divisble by 2
        # then it's even
        if i%2==0:
 
                # if above condition is true
                # print the number
                print(i)

# if the given number is 10
given_number = 10
 
# set up a variable to store the sum
# with initial value of 0
sum = 0
 
# since we want to include the number 10 in the sum
# increment given number by 1 in the for loop
for i in range(1,given_number+1):
        sum+=i
 
# print the total sum at the end
print(sum)

# if the given range is 10
given_range = 10
 
# set up a variable to store the sum
# with initial value of 0
sum = 0
 
for i in range(given_range):
 
        # if i is odd, add it
        # to the sum variable
        if i%2!=0:
                sum+=i
 
# print the total sum at the end
print(sum)

# if the given range is 10
given_number = 5
 
for i in range(11):
        print (given_number," x",i," =",5*i)

# if the below list is given
list = [1,2,4,6,88,125]
 for i in list:
    print(i)

# if the given number is 129475
given_number = 129475
 
# since we cannot iterate over an integer
# in python, we need to convert the
# integer into string first using the
# str() function
given_number = str(given_number)
 
# declare a variable to store
# the count of digits in the
# given number with value 0
count=0
 
for i in given_number:
        count += 1
 
# print the total count at the end
print(count)

# given string
given_string = "madam"
 
# an empty string variable to store
# the given string in reverse
reverse_string = ""
 
# iterate through the given string
# and append each element of the given string
# to the reverse_string variable
for i in given_string:
    reverse_string = i + reverse_string  
 
# if given_string matches the reverse_srting exactly
# the given string is a palindrome
if(given_string == reverse_string):
   print("The string", given_string,"is a Palindrome.")
 
# else the given string is not a palindrome   
else:
   print("The string",given_string,"is NOT a Palindrome.")

# input string from user
given_string = input()
 
# an empty string variable to store
# the given string in reverse
reverse_string = ""
 
# iterate through the given string
# and append each element of the given string
# to the reverse_string variable
for i in given_string:
    reverse_string = i + reverse_string  
 
# print the reverse_string variable
print(reverse_string)

# the given number
given_number = 153
 
# convert given number to string
# so that we can iterate through it
given_number = str(given_number)
 
# store the lenght of the string for future use
string_length = len(given_number)
 
# initialize a sum variable with
# 0 value to store the sum of the product of
# each digit
sum = 0
 
# iterate through the given string
for i in given_number:
    sum += int(i)**string_length
 
# if the sum matches the given string
# its an amstrong number
if sum == int(given_number):
    print("The given number",given_number,"is an Amstrong number.")
 
# if the sum do not match with the given string
# its an amstrong number
else:
    print("The given number",given_number,"is Not an Amstrong number.")

# given list of numbers
num_list = [1,3,5,6,99,134,55]
 
 
# iterate through the list elemets
# using for loop
for i in num_list:
 
    # if divided by 2, all even
    # number leave a remainder of 0
    if i%2==0:
        print(i,"is an even number.")
 
    # if remainder is not zero
    # then it's an odd number
    else:
        print(i,"is an odd number.")

# import the math library
import math
 
# function to print all
# non-primes in a range
def is_not_prime(n):
 
    # flag to track
    # if no. is prime or not
    # initially assume all numbers are
    # non prime
    flag = False
 
    # iterate in the given range
    # using for loop starting from 2
    # as 0 & 1 are neither prime
    # nor composite
    for i in range(2, int(math.sqrt(n)) + 1):
 
        # condition to check if a
        # number is prime or not
        if n % i == 0:
            flag = True
    return flag
 
# lower bound of the range
range_starts = 10
 
# upper bound of the range
range_ends = 30
print("Non-prime numbers between",range_starts,"and", range_ends,"are:")
 
for number in filter(is_not_prime, range(range_starts, range_ends)):
    print(number)

# given upper bound
num = 50
 
# initial values in the series
first_value,second_value = 0, 1
 
# iterate in the given range
# of numbers
for n in range(0, num):
 
    # if no. is less than 1
    # move to next number
    if(n <= 1):
        next = n
 
    # if number is within range
    # execute the below code block
    if nextnum:
        break
    # print each element that
    # satisfies all the above conditions
    print(next)

# given number
given_number= 5
 
 # since 1 is a factor
 # of all number
 # set the factorial to 1
factorial = 1
 
# iterate till the given number
for i in range(1, given_number + 1):
    factorial = factorial * i
 
print("The factorial of ", given_number, " is ", factorial)

# take string input from user
user_input = input()
 
# declare 2 variable to store
# letters and digits
digits = 0
letters = 0
 
# iterate through the input string
for i in user_input:
 
    # check if the character
    # is a digit using
    # the isdigit() method
    if i.isdigit():
 
        # if true, increment the value
        # of digits variable by 1
        digits=digits+1
 
    # check if the character
    # is an alphabet using
    # the isalpha() method
    elif i.isalpha():
 
        # if true, increment the value
        # of letters variable by 1
        letters=letters+1
 
print(" The input string",user_input, "has", letters, "letters and", digits,"digits.")

# given range
given_range = 25
 
# iterate using a for loop till the
# given range
for i in range(given_range+1):
 
    # if no. is multiple of 4 and 5
    # print fizzbuzz
    if i % 4 == 0 and i % 5 == 0:
        print("fizzbuzz")
 
        # continue with the loop
        continue
 
    # if no. is divisible by 4
    # print fizz and no by 5
    if i % 4 == 0 and i%5!=0:
        print("fizz")
 
        # continue with the loop
        continue
    # if no. is divisible by 5
    # print buzz and not by 4
    if i % 5 == 0 and i % 4!= 0:
        print("buzz")
 
    else:
 
        # else just print the no.
        print(i)

# input password from user
password = input()
 
# set up flags for each criteria
# of a valid password
has_valid_length = False
has_lower_case = False
has_upper_case = False
has_digits = False
has_special_characters = False
 
 
# first verify if the length of password is
# higher or equal to 8 and lower or equal to 16
if (len(password) >= 8) and (len(password)<=16):
 
    has_valid_length = True
 
    # iterate through each characters
    # of the password
    for i in password:
 
        # check if there are lowercase alphabets
        if (i.islower()):
                has_lower_case = True                   
 
        # check if there are uppercase alphabets
        if (i.isupper()):
                has_upper_case = True                   
 
        # check if the password has digits
        if (i.isdigit()):
                has_digits = True                       
 
        # check if the password has special characters
        if(i=="@" or i=="$" or i=="_"or i=="#" or i=="^" or i=="&" or i=="*"):
                has_special_characters = True           
 
 
if (has_valid_length==True and has_lower_case ==True and has_upper_case == True and has_digits == True and has_special_characters == True):
    print("Valid Password")
else:
        print("Invalid Password")

# given list of month name
month = ["January", "April", "August","June","Dovember"]
 
# iterate through each mont in the list
for i in month:
    if i == "February":
            print("The month of February has 28/29 days")
    elif i in ("April", "June", "September", "November"):
            print("The month of",i,"has 30 days.")
    elif i in ("January", "March", "May", "July", "August", "October", "December"):
            print("The month of",i,"has 31 days.")
    else:
            print(i,"is not a valid month name.")