Practice Top 30 Python Programming Questions on Iterators and Iterables

Practice Top 30 Python Programming Questions on Iterators and Iterables

Q1. Write a class Counter that implements an iterator to yield numbers starting from 1 up to a given number n.  

Input:  
Enter n: 5  
 
Expected Output:  
1  
2  
3  
4  
5 

Q2. Write a class ReverseString that implements an iterator to iterate through a string in reverse.  

Input:  
Enter a string: Python  
 
Expected Output:  
n  
o  
h  
t  
y  
P 

Q3. Use the map function to double each number in a given list of numbers.  

Input:  
[1, 2, 3, 4, 5]  

Expected Output:  
[2, 4, 6, 8, 10]

Q4. Write an iterator InfiniteCounter that starts from a given number and keeps incrementing indefinitely. Print the first 5 numbers.  

Input:  
Start at 10  

Expected Output:  
10  
11  
12  
13  
14 

Q5. Use the filter function to filter out even numbers from a list of numbers.  

Input:  
[1, 2, 3, 4, 5, 6]  

Expected Output:  
[2, 4, 6]

Q6. Write an iterator FibonacciIterator that generates Fibonacci numbers up to a given limit n.  

Input:  
Enter n: 10  

Expected Output:  
0  
1  
1  
2  
3  
5  
8 

Q7. Use the zip function to combine two lists into a list of tuples.  

Input:  
List1: [1, 2, 3]  
List2: ['a', 'b', 'c']  
 
Expected Output:  
[(1, 'a'), (2, 'b'), (3, 'c')]

Q8. Write a class Countdown that implements an iterator to count down from a given number n to 0.  

Input:  
Enter n: 3  

Expected Output:  
3  
2  
1  
0 

Q9. Use the map function to convert all strings in a list to uppercase.  

Input:  
['apple', 'banana', 'cherry']  
 
Expected Output:  
['APPLE', 'BANANA', 'CHERRY']

Q10. Write an iterator PrimeIterator that generates prime numbers up to a given limit n.  

Input:  
Enter n: 10  

Expected Output:  
2  
3  
5  
7

Q11. Use the filter function to extract all odd numbers from a list.  

Input:  
[1, 2, 3, 4, 5, 6]  
 
Expected Output:  
[1, 3, 5]

Q12. Use the zip function to combine two lists of different lengths into a list of tuples, padding with None for missing values.  

Input:  
List1: [1, 2, 3]  
List2: ['a', 'b']  

Expected Output:  
[(1, 'a'), (2, 'b'), (3, None)]

Q13. Write an iterator CustomRange that mimics Python's range(start, stop, step) functionality.  

Input:  
start: 2  
stop: 10  
step: 2  

Expected Output:  
2  
4  
6  
8  

Q14. Use the map function to square each number in a given list.  

Input:  
[1, 2, 3, 4, 5]  
 
Expected Output:  
[1, 4, 9, 16, 25]

Q15. Write an iterator EvenIterator that generates even numbers starting from 0 up to a given limit n.  

Input:  
Enter n: 10  

Expected Output:  
0  
2  
4  
6  
8  
10

Q16. Use the filter function to remove negative numbers from a list.  

Input:  
[1, -2, 3, -4, 5]  
 
Expected Output:  
[1, 3, 5] 

Q17. Write a class AlphabetIterator that generates the alphabet from 'a' to 'z'.  

Expected Output:  
a  
b  
c  
d  
e  
...  
z

Q18. Use the map function to add corresponding elements from two lists.  

Input:  
List1: [1, 2, 3]  
List2: [4, 5, 6]  

Expected Output:  
[5, 7, 9]

Q19. Write an iterator PalindromeIterator that generates palindromes up to a given limit n.  

Input:  
Enter n: 100  

Expected Output:  
1  
2  
3  
4  
5  
...  
99 

Q20. Use the zip function to combine two lists with different types of elements into a list of tuples.  

Input:  
List1: [1, 2, 3]  
List2: ['a', 'b', 'c']  
 
Expected Output:  
[(1, 'a'), (2, 'b'), (3, 'c')]

Q21. Use the filter function to extract positive numbers from a list.  

Input:  
[1, -2, 3, -4, 5]  
 
Expected Output:  
[1, 3, 5]

Q22. Use the map function to concatenate a prefix to each string in a list.  

Input:  
List: ['apple', 'banana', 'cherry']  
Prefix: 'fruit_'  

Expected Output:  
['fruit_apple', 'fruit_banana', 'fruit_cherry']

Q23. Write an iterator MultiplicationIterator that multiplies each number from a given list by a given factor.  

Input:  
List: [1, 2, 3, 4]  
Factor: 3  

Expected Output:  
3  
6  
9  
12

Q24. Use the zip function to combine two lists of different lengths, filling missing values with a placeholder.  

Input:  
List1: [1, 2, 3]  
List2: ['a', 'b']  
 
Expected Output:  
[(1, 'a'), (2, 'b'), (3, None)]

Q25. Write an iterator DivisibleBy3Iterator that generates numbers divisible by 3 up to a given number n.  

Input:  
Enter n: 15  

Expected Output:  
3  
6  
9  
12  
15  

Q26. Write an iterator DivisibleBy3Iterator that generates numbers divisible by 3 up to a given number n.  

Input:  
Enter n: 15  

Expected Output:  
3  
6  
9  
12  
15 

Q27. Use the map function to find the length of each string in a given list.  

Input:  
['apple', 'banana', 'cherry']  

Expected Output:  
[5, 6, 6]

Q28. Write an iterator ReverseListIterator that iterates over a list in reverse order.  

Input:  
[10, 20, 30, 40]  
 
Expected Output:  
40  
30  
20  
10  

Q29. Use the zip function to create a dictionary by combining two lists, one containing keys and the other containing values.  

Input:  
Keys: ['name', 'age', 'city']  
Values: ['John', 25, 'New York']  
 
Expected Output:  
{'name': 'John', 'age': 25, 'city': 'New York'}

Q30. Use the filter function to extract non-empty strings from a list.  

Input:  
['apple', '', 'banana', '', 'cherry']  
 
Expected Output:  
['apple', 'banana', 'cherry']