Python Basic Programs-1

1. Character Input:

name = input("Enter you name: ")
print("You name is: "+ name)

2. Divisors:
num = int(input("Enter the valid number: "))
divlst = []
for n in list(range(1,num+1)):
    if num % n == 0:
        divlst.append(n)
print(divlst)

3. Find even list
a = [1, 4, 9, 16, 25, 36, 49, 64, 81, 100]
evenlst = []
for num in a:
    if num % 2 == 0:
        evenlst.append(num)

print("the new even list is", evenlst)
or
evenlst = [number for number in a if number % 2 == 0]
print("the new even list is", evenlst)

4. Fibonacci series
def fib(n):
    a = 0
    b = 1
    for i in range(1,n+1):
            c = a + b
            print (b,end=" ") ## to print in single line
            a = b
            b = c

print(fib(5)) 

5. Print list having numbers less than 10
a = [1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]
numlst = []
for num in a:
    if num < 10:
        numlst.append(num)

print(numlst)

6. Find common elements between two lists
a = [1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]
b = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]
# First convert the list to set
a = set([1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89])
print(type(a))
b = set([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13])
print(type(b))
res = a.intersection(b)
print("common elements: ", res)

7. Find max of three values
def max_3(a,b,c):
    if (a>b) and (a>c):
        return a
    if (b>a) and (b>c):
        return b
    if (c>a) and (c>b):
        return c
print("Max value is : ", max_3(7,3,9))

8. Find new list having 1st and last element
newlst = []
def test(lst):
    newlst.append(lst[0])
    newlst.append(lst[-1])
    print(newlst)
lst = [1,2,3,4,5,6,7]
test(lst)

9. Find odd or even number
num = int(input("Enter the number "))
if num %2 == 0:
    print(num, "is the even number")
else:
    print( num, "is the odd number")

10. Find if element is present in given list
def find(ordered_list, element_to_find):
    for element in ordered_list:
        if element == element_to_find:
            return True
    return False

l = [1,2,3,4,5]
print(find(l,10))

11. Find if given string is palindrome
name = input("Enter the string: ")
if name[::] == name[::-1]:
    print(name, "is a palindrome")
else:
    print(name, "is not a palindrome")

12. Find if number is prime or not
num = int(input("Enter a number: "))
if num %2 != 0 or num == 1:
    print(num , "is a prime number")
else:
    print(num, "is not a prime number")

11. Find the sum of two numbers
a = input ("Enter the value of a : ")
b = input ("Enter the value of b : ")
#Note :By defult input takes a string
res = int(a) + int(b)
print("Final ans = ", res)

12. Remove duplicate values from a list
lst = [1,1,2,3,4,5,4,2,10,15,5,6]
newlst = set(lst)
print(newlst)

13. Reverse the order
 def rev(str):
    str = input("Enter the sentence: ")
    new = str[::-1]
    print(new)
rev(str)

14. Square of all numbers
numlst = [1,2,3,4,5,6,7,8]
reslst=list(map(lambda x : x*x, numlst))
print(reslst)

15. Find missing number in list
def missing_no(lst):
    #print(range(lst[0],lst[-1]+1))
    return sum(range(lst[0],lst[-1]+1)) -sum(lst)
lst = [1,2,3,5,6]
print(missing_no(lst))

16. Find power of 2

def powerof2(num):

    ## bitwise calculation

    return ((num & (num - 1)) == 0) and (num != 0)

print(powerof2(8))

17.Print Calender for a given month and year.
import calendar
y = int(input("Input the year: "))
m = int(input("Input the month: "))
print(calendar.month(y,m))

18. Write a Python program to calculate the sum and average of n integer numbers(input from the user). Input 0 to finish.
print("Input some integers to calculate the sum and average. Input 0 for exit")
sum = 0
count = 0
lst = [1,3,4,5,9]
for n in lst:
    sum += n
    count += 1
if count == 0:
    print("Input some numbers")
else:
    print("Average and sum of numbers: ", sum/count, sum)

19. Write a Python program to create the multiplication table (from 1 to 10) of a number
n = int(input("input the number to create multiplication table: "))
for i in range(1,11):
    print(n, 'x', i, "=", n*i)

#Remember
n = 5      ## type is int
n = "5"  ## type is str

20.  Write a Python program to construct the following pattern, using a nested loop number
1
22
333
4444
55555
666666
7777777
88888888
999999999

for i in range(1,10):
    print(str(i)*i)

21. Write a Python script to concatenate following dictionaries to create a new one
dic = {}
dic1 = {1:10,2:20}
dic2 = {3:30,4:40}
dic3 = {5:50,6:60}
for d in (dic1, dic2, dic3):
    dic.update(d)
print(dic)

22. Write a Python program to find those numbers which are divisible by 7 and multiple of 5, between 1500 and 2700 (both included)

lst = []

for n in range(1500,2701):

    if n%7 == 0 and n%5 == 0:

        lst.append(n)

print(lst)

23. Write a Python program to construct the following pattern, using a nested for loop.

* 

* * 

* * * 

* * * * 

* * * * * 

* * * * 

* * * 

* * 

*

n = 5

for i in range(5):

    for j in range(i):

        print('* ', end='')

    print("")

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

    for j in range(i):

        print("* ", end="")

    print('')

24. Write a Python program that accepts a word from the user and reverse it

word = input("Enter the word: ")

res = word[::-1]

print(res)

25. Write a Python program to count the number of even and odd numbers from a series of numbers

numbers = (1, 2, 3, 4, 5, 6, 7, 8, 9)

even_num = []

odd_num = []

for n in numbers:

    if n%2 == 0:

        even_num.append(n)

    else:

        odd_num.append(n)

print("Number of even numbers: ", len(even_num))

print("Number of odd numbers: ", len(odd_num))

#ALITER

numbers = (1, 2, 3, 4, 5, 6, 7, 8, 9)

even_count = 0

odd_count = 0

for n in numbers:

    if n%2 == 0:

        even_count += 1

    else:

        odd_count += 1

print("Number of even numbers: ", even_count)

print("Number of odd numbers: ", odd_count)
#ALITER

even_num = len([n for n in numbers if n % 2 == 0])

odd_num = len([n for n in numbers if n % 2 != 0])

26. Write a Python program that prints each item and its corresponding type from the following list

datalist = [1452, 11.23, 1+2j, True, 'w3resource', (0, -1), [5, 12], {"class":'V', "section":'A'}]

print(datalist)

for item in datalist:

    print(item, type(item))

    

27.Write a Python program that prints all the numbers from 0 to 6 except 3 and 6

lst = []

for i in range(0,7):

    if i == 3 or i == 6:

        continue

    lst.append(i)

print(lst)

28. Write a Python program to print Fibonacci series b/t 0 to 50

x,y=0,1

while y<50: div="">

    print(y)

    x,y = y,x+y

#ALITER

    

def fib(num):

    a,b = 0,1

    for num in range(num):

        if a < num:

            yield a

            a,b =b,a+b

print(list(fib(50)))

29. Write a Python program which takes two digits m (row) and n (column) as input and generates a two-dimensional array. The element value in the i-th row and j-th column of the array should be i*j

row_num = int(input("Input number of rows: "))

col_num = int(input("Input number of columns: "))

multi_list = [[0 for col in range(col_num)] for row in range(row_num)]

for row in range(row_num):

    for col in range(col_num):

        multi_list[row][col]= row*col

print(multi_list)

#ALITER

        

row = 2

column = 3

a = [[i*j for j in range(column)] for i in range(row)]

print(a)

30. Write a Python program that accepts a string and calculate the number of digits and letters

data = "Python 3.2"

d=l=0

for i in data:

    if i.isdigit():

        d += 1

    elif i.isalpha():

        l += 1

    else:

        pass

print("letters: ", l)

print("digits: ", d)

31. Write a Python program to check whether an alphabet is a vowel or consonant

char = input("Input the letter of the alphabet: ")

if char in ('a','e','i','o','u'):

    print("%s is a vowel " % char)

else:

    print("%s is a consonant " % char)

32. Add key to dictionary

dict1 = {0:10, 1:20}

dict1[2] = "30"

print(dict1)

33.Write a Python script to check if a given key already exists in a dictionary

dict={1:"one",2:"two",3:"three"}

print(dict)

print(dict.keys())

print(dict.values())

key = input("Enter the value of key ")

for k in dict:

    if k == key:

        print("Entered key %s is already there", key)

    else:

        print("Entered key is not present")

34. Write a Python program to iterate over dictionaries using for loops

d = {"blue" : 1, "green" : 2, "yellow" : 3}

for key,value in d.items():

    print(key, value)

35. Write a Python program to map two lists into a dictionary

keys = ['1','2','3','4','5','6']

values = ['one','two','three','four','five','six']

d = dict(zip(keys, values))

print(d)

36. Write a Python function to find the Max of three numbers

def sum(n1,n2,n3):

    if n1>n2 and n1>n3:

        print("max number is", n1)

    elif n2>n1 and n2> n3:

        print("max number is", n2)

    else:

        print("max number is", n3)

sum(3,1,7)

        

37. Write a Python function to sum all the numbers in a list

def sum(lst):

    res = 0

    for i in lst:

        res += i

    return res

    

lst = [1,2,3,4,5,-1]

print(sum(lst))

38. Write a Python function to multiply all the numbers in a list

def mul(lst):

    res = 1

    for i in lst:

        res = res*i

    return res

lst = [8, 2, 3, -1, 7]

print(mul(lst))

39. Write a Python program to reverse a string

def rev(str):

    res = str[::-1]

    return res

str = "1234abcd"

print(rev(str))

40. Write a Python function to calculate the factorial of a number

def fac(n):

    if n <= 0:

        return 1

    else:

        res = n* fac(n-1)

        return res

print("factorial is :", fac(4))

41. Write a Python function to check whether a number is in a given range

def test_range(n):

    if n in range(3,9):

        print("%s is in range"%n)

    else:

        print("number is outside of range")

test_range(5)

42.Write a Python function that accepts a string and calculate the number of upper case letters and lower case letters

def string_test(s):

    d={"UPPER_CASE":0, "LOWER_CASE":0}

    for c in s:

        if c.isupper():

            d["UPPER_CASE"] += 1

        elif c.islower():

            d["LOWER_CASE"] += 1

        else:

            pass

    print("No of upper case chars: ", d["UPPER_CASE"])

    print("NO of lower case chars:", d["LOWER_CASE"])

string_test('The quick Brown Fox')

43. Write a Python function that takes a list and returns a new list with unique elements of the first list

def unique_list(lst):

    x = []

    for a in lst:

        if a not in x:

            x.append(a)

    return x

   

lst = [1,2,3,3,4,4,5]

print(unique_list(lst))

    

44. Write a Python program to print the even numbers from a given list

def print_even(l):

    even_list = []

    for i in l:

        if i % 2 == 0:

            even_list.append(i)

    return even_list

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

print(print_even(l))

45. Write a Python program that accepts a hyphen-separated sequence of words as input and prints the words in a hyphen-separated sequence after sorting them alphabetically

def input_str(s):

    lst = s.split('-')

    lst.sort()

    print('-'.join(lst))

    

input_str("green-red-yellow-black-white")

46. Write a Python function to create and print a list where the values are square of numbers between 1 and 30 (both included)

def sqr_num(n1,n2):

    res_list = []

    for i in range(n1,n2+1):

        res_list.append(i**2)

    return res_list

print(sqr_num(1,30))

47. Write a Python program to access a function inside a function

def test(a):

    def add(b):

        nonlocal a

        a += 1

        return a+b

    return add

func = test(4)

print(func(4))

48. Write a Python script to merge two Python dictionaries

d1 = {"a": "100", "b": "200"}

d2 = {"x": "4", "y": "500"}

d = d1.copy()

d.update(d2)

print(d)

print(d1.keys())

print(d1)

print(d1.values())

49. Write a Python program to get the maximum and minimum value in a dictionary.

my_dict = {'x':500, 'y':5874, 'z': 560}

key_max = max(my_dict.keys(), key=(lambda k: my_dict[k]))

key_min = min(my_dict.keys(), key=(lambda k: my_dict[k]))

print('Maximum Value: ',my_dict[key_max])

print('Minimum Value: ',my_dict[key_min])

#ALITER

values = my_dict.values()

print(values)

min = sorted(values)[0]

max = sorted(values)[-1]

print(min)

print(max)

50. Write a Python program to multiply all the items in a dictionary

#import math

d = {'n1': 5,'n2': 2,'n3': 3}

#print(mul.dict.vlaues())

res = 1

for key in d:

    res= res*d[key]

print(res)

#ALITER

d = {'n1': 5,'n2': 2,'n3': 3}

print(d.values())

res = 1

for i in d.values():

    res=res*i

print(res)

print(d.items())

51. Write a Python program to check that a string contains only a certain set of characters (in this case a-z, A-Z and 0-9).

import re

def match(str):

    charRe = re.compile(r'[^a-zA-Z0-9.]')

    str = charRe.search(str)

    return not bool(str)

print(match("ABCDEFabcdef123450"))

print(match("*&%@#!}{"))

52. Write a Python program that matches a string that has an a followed by zero or more b's 

import re

def text_match(text):

    patterns = 'ab*?'

    if re.search(patterns, text):

        return "match found"

    else:

        return "match not found"

print(text_match("ac"))

print(text_match("abc"))

print(text_match("abbc"))

print(text_match("bc"))

print(text_match("ababab"))

53. Write a Python program that matches a string that has an a followed by zero or one 'b'.

import re  

def text_match(text):  

        patterns = 'ab??'  

        if re.search(patterns,  text):  

                return 'Found a match!'  

        else:  

                return('Not matched!')    

print(text_match("ab"))  

print(text_match("abc"))  

print(text_match("abbc"))  

print(text_match("aabbc"))

print(text_match("a"))

54. Write a Python program that matches a string that has an a followed by three 'b' 

import re

def text_match(text):

        patterns = 'ab{3}?'

        if re.search(patterns,  text):

                return 'Found a match!'

        else:

                return('Not matched!')

print(text_match("abbb"))

print(text_match("aabbbbbc"))

55. Write a Python program that matches a string that has an a followed by two to three 'b' - 

import re  

def text_match(text):  

        patterns = 'ab{2,3}?'  

        if re.search(patterns,  text):  

                return 'Found a match!'  

        else:  

                return('Not matched!')  

  

print(text_match("ab"))  

print(text_match("aabbbbbc"))

56. Write a Python program to find sequences of lowercase letters joined with a underscore 

import re  

def text_match(text):  

        patterns = '^[a-z]+_[a-z]+$'  

        if re.search(patterns,  text):  

                return 'Found a match!'  

        else:  

                return('Not matched!')  

  

print(text_match("aab_cbbbc"))  

print(text_match("aab_Abbbc"))  

print(text_match("Aaab_abbbc"))

57. Write a Python program to find sequences of one upper case letter followed by lower case - 

import re  

def text_match(text):  

        patterns = '^[A-Z][a-z]+$'  

        if re.search(patterns,  text):  

                return 'Found a match!'  

        else:  

                return('Not matched!')  

  

print(text_match("bc"))  

print(text_match("Abbbc"))  

print(text_match("aabSBbbc"))

58. Write a Python program that matches a string that has an 'a' followed by anything, ending in 'b' 

import re

def text_match(text):

        patterns = 'a.*?b$'

        if re.search(patterns,  text):

                return 'Found a match!'

        else:

                return('Not matched!')

print(text_match("aabbbbd"))

print(text_match("aabAbbbc"))

print(text_match("accddbbjjjb"))

59. Write a Python program that matches a word at the beginning of a string

import re  

def text_match(text):  

        patterns = '^\w+'  

        if re.search(patterns,  text):  

                return 'Found a match!'  

        else:  

                return('Not matched!')  

  

print(text_match("The quick brown fox jumps over the lazy dog."))  

print(text_match(" The quick brown fox jumps over the lazy dog."))

60. Write a Python program that matches a word at end of string, with optional punctuation

import re  

def text_match(text):  

        patterns = '\w+\S*$'  

        if re.search(patterns,  text):  

                return 'Found a match!'  

        else:  

                return('Not matched!')  

  

print(text_match("The quick brown fox jumps over the lazy dog."))  

print(text_match("The quick brown fox jumps over the lazy dog. "))  

print(text_match("The quick brown fox jumps over the lazy dog "))

61. Write a Python program that matches a word containing 'z'

import re  

def text_match(text):  

        patterns = '\w*z.\w*'  

        if re.search(patterns,  text):  

                return 'Found a match!'  

        else:  

                return('Not matched!')  

  

print(text_match("The quick brown fox jumps over the lazy dog."))  

print(text_match("Python Exercises."))

61. Write a Python program that matches a word containing 'z', not start or end of the word. - 

patterns = '\Bz\B'

62. Write a Python program to match a string that contains only upper and lowercase letters, numbers, and underscores 

import re

def text_match(text):

        patterns = '^[a-zA-Z0-9_]*$'

        if re.search(patterns,  text):

                return 'Found a match!'

        else:

                return('Not matched!')

print(text_match("The quick brown fox jumps over the lazy dog."))

print(text_match("Python_Exercises_1"))

63. Write a Python program where a string will start with a specific number

import re

def match_num(string):

    text = re.compile(r"^5")

    if text.match(string):

        return True

    else:

        return False

print(match_num('5-2345861'))

print(match_num('6-2345861'))