Python-Practices

I'm adding some basic "python practices", questions and solution codes. Practicing while having fun is the best part of learning.

• You can find the Turkish explanation of these practices on my Medium account: https://medium.com/@super.feyza

First Practice:

1. Let's calculate in which year you will be 100 years old:
2. First of all, to take the instant date, I'll import a libarary which is

3. from datetime import date

4. When we run this code, we see the instant date:

5. today = date.today()

6. print("date:", today)

7. You will see the date as year-month-day. If you want to write as Day-Month-Year:

8. day_month_year = today.strftime("%d/%m/%Y")

9. Since our goal is to find out which year we will be 100 years old, let's take the year from the date (day_month_year):

10. year = int(day_month_year[6:10]) #We made the year which is the string an integer

11. print(f"We are now in {year}") # Output will be "We are in the year now."

12. Let's edit the code we write for the user, get some information from the user to reach the result:

13. name = input("What is your name: ")

14. age = int(input("How old are you: "))

15. Now that we know the age and date of the user, let's write the final code using a little bit mathematical equation:

16. a = str((year-age)+100)

17. print(name + " will be 100 years old in the year " + a)

Second Practice:

1. In this practice, we will write a code to generate passwords with random letters and numbers.
2. First of all, let's start by importing the "random" and "string" modules.

3. import random

4. import string

5. Then we use the "ASCII" method so that the algorithm can assign random characters from lowercase, uppercase and numbers to us.

6. lower = string.ascii_lowercase #for lowercase

7. upper = string.ascii_uppercase #for uppercase

8. num = string.digits #for numbers

9. Now we can combine the characters from lowercase, uppercase, and numbers into a password.

10. all = lower + upper + num

11. We can also ask the user how many characters the password they want to create should be.

12. lenght = int(input("Enter the password lenght you want:"))

13. To complete the process, we generate a random, user-selected template of the length.

14. template = random.sample(all,lenght)

15. password= "".join(template)

16. With the Join() method we take all the elements in an iterable and concatenate them into a single string.
17. Last step, let's print the password.

18. print(password)

Third Practice:

1. In this practice, we will code a program that calculates the Body Mass Index.
2. First of all, we need to get the weight in kilograms and the height in meters from the user.

3. height = float(input("Enter your height in meters: "))

4. weight = float(input("Enter your weight in kilograms: "))

5. We abbreviate the body mass index as “MBI” and put the mathematical calculation into code.

6. MBI = weight/(height**2)

7. We give the output of the body mass index to the user,

8. print("Your Body Mass Index is: {0:.2f}\n".format(MBI), end='')

9. The reason why I use {0:.2f} here: I don't prefer to see 2 numbers after the dot on the screen when MBI is fractional.
10. \n is an expression I added because I prefer that the next output starts from a bottom line.
11. The user learned the body mass index, but adding whether this value is in the normal range will make the code we wrote more meaningful.

**Fourth Practise:""

1. This code will tell you how to solve a problem asked in the "hackerrank": https://www.hackerrank.com/challenges/mini-max-sum/problem?isFullScreen=true
2. Given five positive integers, find the minimum and maximum values that can be calculated by summing exactly four of the five integers.
3. Then print the respective minimum and maximum values as a single line of two space-separated long integers.
4. For example, arr = [1,2,3,4,5] Minimum sum of this list: 1+2+3+4 =10 ; the maximum sum is 2+3+4+5 =14.
5. You don't have to write all the codes on this site. That's why you should pay attention to what points they want from you.
6. What we need to think about is that if we order our list from smallest to largest, adding 4 values ​​from the beginning and 4 from the end will solve our problem.

7. arr.sort() #arr is the argument of the function they want us to write.

8. It doesn't have to be the only solution.
9. Now, if we add all the elements of the list and subtract from the last element and the first element, we can find the minimum and maximum values respectively.

10. s = sum(arr)

11. maximum = s - arr[0]

12. minimum = s - arr[len(arr) - 1]