Python 100 Questions, 100 Python Problems with Solutions for Beginners | Most Common Python Programs for Practice !! BY Rakesh !!

21. Write a function that checks if a number is a perfect square.

22. Write a function that checks if a number is an Armstrong number.

23. Write a function that checks if a string is a valid URL.

24. Write a function that checks if a number is a power of two.

25. Write a function that returns the Fibonacci sequence up to a given number.

26. Write a Python script to concatenate three dictionaries.

27. Create a dictionary with key as a value as 1; create a new dictionary from this one where the value for a is 100.

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

29. Write a Python script to iterate over dictionaries using for loops.

30. Write a Python script to generate and print a dictionary that contains a number (between 1 and n) in the form (x, x*x).

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