Learn Python By Example

Python Solved Questions

Disclaimer : This is a blog post for people learning python. The idea is to show one way of solving a problem and getting away with the task in hand.

1. Printing 'hello world' to a variable.

print("hello world")

2. Accept User Input with the string displayed 'Enter your name'

name = input("Enter your name : ")

3. Print the entered name by the user to the terminal with the text before it : hello name entered by user'

print(f"hello {name}")

4. Import the library json

import json

5. Declare a string with an initial value 'hi'

hi_txt  = "hi"

6. Declare an empty string in python.

name = str() # using contructor

name = ""

7. Write a program to accept user input and convert to int.

num = input("Enter a number: ")
num = int(num)

OR

num = int(input("Enter a number: "))

8. Declare a list of numbers.

my_list = [1,2,3]

9. Declare a list of numbers from 0-9.

my_list = [item for item in range(10)]

10. Accept User input and print the length of the string.

name = input("Enter your name : ")
print(f"Number of characters : {len(name)}")

11. Initialize a dict with random user data.

user_data = {
    "name": "henry", 
    "age": 30, 
    "employeed": True
}

12. Unpack the tuple into x and y co-ordinates and print it.

pt = (1.2, 3.6)
x, y = pt
print(f"x : {x}")
print(f"y : {y}")

13. Given a tuple of x, y, z co-ordinates, unpack the x co-ordinate and the rest in another tuple and print the x co-ordinate.

pt = (1,2,3)
x, *other = pt
print(f"x : {x}")

14. Generate a random number between 0 and 1000 using the random module and print it to the console.

import random 

num = random.randint(0, 1000)

print(f"num : {num}")

15. Given a python dict, convert it to a json object using the json library.

import json 

data = {"name": "dan", "age": 33}
json_data = json.dumps(data)

16. Reverse a python list.

scores = [3,5,2,3,6,1]
rev_scores = scores[::-1]

17. define a python function.

def f():
    pass

18. Given a string, split it on every occurence of ,

line = 'here is a comma, here is another comma,'
rv = [item for item in line.split(",") if item]

19. Check if a string ends with txt

file_name = "data.csv"
rv = file_name.endswith("txt")
print(f"rv : {rv}")

20. Given a float value ( num = 1.022 ), print it with accuracy of 2 decimal points.

num = 1.022
rv = format(num, "0.2f")

21. Define infinity.

inf = float('inf')

22. Given a list of items, return a random item from the list using the random module.

import random

data = ['one', 'two', 'three', 'four']
rv= random.choices(data)
print(f"rv : {rv}")

23. Define a class in Python

class A:
    pass

24. Write code to change the string representation of a class.

class A:
    def __str__(self): 
        return "className : A"

25. Write a function that takes any number of positional arguments.

def f(*args):
    pass

26. Write a function that takes any number of keyword arguments.

def f(**kwargs):
    pass

27. Write a function that takes any number of positional and keyword arguments.

def f(*args, **kwargs):
    pass

28. Write a python function with the type of the arguments.

def f(quantity: int, price: float, items: dict): 
    pass

29. sleep for 3 seconds before executing the function.

from time import sleep

def f():
    print(f'sleeping for 3 seconds')
    sleep(3)
    pass

30. Find the time taken to run a function.

from time import sleep, time
def f():

    before = time()

    sleep(3) # simulating some work

    after = time()

    time_taken = after - before
    print(f"time_taken : {time_taken}")