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Solution Exercise 20: swapping the first character and the last character of a string in python

26 octobre 2022PythonTechPython Exercises2 Comments

Exercise20 Write a Python program, to swap the first and the last character of a given string. Solution

# define an example of string s
s = "Python"
# get the length of the string s
n = len(s)
# get the first character of the string s
first = s[0]
last = s[n-1]
# extract the substring obtained from s ignoring the first and the last character
s1 = s[1:n-1]
# construct a new string by changing the first and last character
s2 = last + s1 + first
print(s2) # output: 'nythoP'

# define an example of string s

s = "Python"

# get the length of the string s

n = len(s)

# get the first character of the string s

first = s[0]

last = s[n-1]

# extract the substring obtained from s ignoring the first and the last character

s1 = s[1:n-1]

# construct a new string by changing the first and last character

s2 = last + s1 + first

print(s2) # output: 'nythoP'

Younes Derfoufi CRMEF OUJDA

Solution Exercise 19: listing the elements of a list in python

26 octobre 2022PythonTechPython Exercises2 Comments

Exercise 19 Write a Python algorithm that list the strings that make up the list l = ["laptop", "iphone", "tablet"] while indicating the length of each string. Solution

l = ["laptop", "iphone", "tablet", "printer", "Ipad"]
# iterate through the elements of the list l
for x in l:
     print(x, " is in list l, its length is: ", len(x))

l = ["laptop", "iphone", "tablet", "printer", "Ipad"]

# iterate through the elements of the list l

for x in l:

print(x, " is in list l, its length is: ", len(x))

Younes Derfoufi CRMEF OUJDA

Solution Exercise 14 perfect square in Python

4 octobre 202212 octobre 2022PythonTechPython Exercises1 Comment

Exercise 14 Write a python program that asks the user to enter an integer n and display whether this number is a perfect square or not.

Solution Exercise 18: position of a character in a Python string

3 octobre 202225 octobre 2022PythonTechPython Exercises2 Comments

Exercise 18 Write a program in Python that asks the user to enter a string of characters s and send back a message indicating whether the string contains the letter 'a' while indicating its position on the string. Example if the user types the string s = 'language' the program returns: The letter 'a' is…

Solution Exercise 17: number of occurrences of a character in a Python string

3 octobre 202225 octobre 2022PythonTechPython Exercises1 Comment

Exercise 17 Write a Python program to display for a given string of characters "s", the number of occurrences of each character in the string "s". Example for the string s = "Python.org" the program should display: The character: "P" appears once in the string s The character: "y" appears once in the string s…

Solution Exercise 6: python algorithm that determines the length of given list

2 octobre 20229 octobre 2022PythonTechPython Exercises1 Comment

Exercise 6 Write a Python program that returns the length of a given list without using the len() method.

Solution Exercise 2: python algorithm that swaps the first element of a list with the last

2 octobre 20228 octobre 2022PythonTechPython Exercises1 Comment

Exercise 2 Write a Python algorithm to swap the first element with the last element of a given list. Example: if L = ["Python", "Java", "C++", "Javascript"], the algorithm returns the list: ["Javascript", "Java", "C++", "Python"]

Solution Exercise 11: algorithm python that find the divisors of an integer in python

2 octobre 20228 octobre 2022PythonTechPython Exercises1 Comment

Exercise 11 Write a program in Python that asks the user to enter an integer n and displays all the divisors of this number.

Solution Exercise 9: python program that compute the factorial of an integer n

2 octobre 20228 octobre 2022PythonTechPython Exercises1 Comment

Exercise 9. Write a program in Python that asks the user to enter an integer n and display n! Solution

Solution Exercise 8: calculating the sum of the first numbers in Python

2 octobre 20228 octobre 2022PythonTechPython Exercises1 Comment

Exercise 8 Write a python algorithm that asks the user to enter an integer n and displays the value of the sum 1 + 2 + … + n = ?

Solution Exercise 7: maximum of three numbers in Python

2 octobre 20228 octobre 2022PythonTechPython Exercises1 Comment

Exercise 7 Write a Python algorithm that asks the user to enter 3 numbers x, y and z and display their maximum without using any predefined function.

Solution Exercise 12: maximum and minimum of a Python list

2 octobre 202211 octobre 2022PythonTechPython Exercises1 Comment

Exercise 12 By using the sort() method, write an algorithm in python as a function which takes a list L of numbers as a parameter and which returns the tuple (min , max) formed from the minimum and the maximum of the list.

Solution Exercise 12: multiplication table in python

2 octobre 202210 octobre 2022PythonTechPython Exercises1 Comment

Exercise 12 . 1) – Write a program in Python that asks the user to enter an integer n and display him the multiplication table of this number. 2) – Improve the program so that it displays the multiplication tables of all the numbers between 1 and 9

Solution Exercise 11: multiply the elements of a Python list

2 octobre 202210 octobre 2022PythonTechPython Exercises1 Comment

Exercise 11 Write an algorithm in python as a function which takes as parameters a tuple (L, n) formed by a list L of numbers and an integer n and which returns the list obtained from L by multiplying its elements by n . Example if L = [13, 11, 7, 25] and n =…

Solution Exercise 10: python algorithm that returns the position of an element in a list

2 octobre 202210 octobre 2022PythonTechPython Exercises1 Comment

Exercise 10 Write an algorithm in python as a function which takes as a parameter a tuple (L, a) formed by a list L and an element 'a' and which returns the position of the element 'a' in the list L. The function must return -1 if the element 'a' is not in the list.

Solution Exercise 8: python algorithm which calculates the average of the elements of a list

2 octobre 202210 octobre 2022PythonTechPython Exercises1 Comment

Exercise 8 Write an algorithm in python that returns the average of the terms of a list of numbers.

Solution Exercise 7: Python algorithm that returns the list of divisors of a number

2 octobre 202210 octobre 2022PythonTechPython Exercises1 Comment

Exercise 7 Write a Python program that returns the list of divisors of a given integer. Example if n = 36 , the algorithm returns the list [1, 2, 3, 6, 9, 18 , 36]