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python_Cognizant_2026.md

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✅ CLEAR & MEDIUM-LEVEL PYTHON QUESTIONS (TOPIC-WISE)

(Only Python — no DSA, no heavy logic)

🟦 1. LIST — Clear Questions

  • Write a program to remove duplicates from a list while keeping the original order.
  • Given a list of numbers, find the second largest element without using sort().
  • Count how many times each element appears in a list.
  • Rotate a list to the right by N positions.
  • Remove all negative numbers from a list.
  • Find common elements between two lists.
  • Reverse a list using slicing.
  • Add all even numbers from a list.
  • Replace every element greater than 50 with the value 50.
  • Convert a nested list like [[1,2],[3,4]] into [1,2,3,4].

🟩 2. TUPLE — Clear Questions

  • Convert a tuple into a list, modify it, and convert back to tuple.
  • Find how many times a value occurs in a tuple.
  • Find the maximum and minimum values in a tuple.
  • Join two tuples into one.
  • Check whether a given element exists in a tuple.
  • Slice a tuple to get alternate elements.
  • Remove an element from a tuple (using conversion).
  • Create a tuple of squares from 1 to 10.
  • Swap the contents of two tuples.
  • Unpack a tuple of 5 elements into variables.

🟧 3. SET — Clear Questions

  • Perform union, intersection, and difference of two sets.
  • Remove duplicates from a list using a set.
  • Check whether set A is a subset of set B.
  • Get all unique words from a sentence.
  • Find uncommon elements between two sets.
  • Remove an item from a set without raising an error.
  • Convert list → set → sorted list.
  • Create a set of squares of numbers 1–10 using set comprehension.
  • Find elements that are in either set A or set B but not both.
  • Check if two sets are disjoint.

🟥 4. DICTIONARY — Clear Questions

  • Count the frequency of each character in a given string.
  • Merge two dictionaries into one.
  • Sort a dictionary by its keys.
  • Sort a dictionary by its values.
  • Find the key with the highest value.
  • Convert two lists — one with keys, one with values — into a dictionary.
  • Reverse keys and values in a dictionary.
  • Check if a specific key exists in a dictionary.
  • Remove a key from a dictionary safely.
  • Create a dictionary storing squares from 1 to 10.

🟪 5. STRING — Clear Questions

  • Check whether a string is a palindrome.
  • Remove all vowels from a string.
  • Count the number of uppercase, lowercase, digits, and spaces.
  • Find the longest word in a sentence.
  • Reverse each word in a given sentence.
  • Convert a snake_case string to camelCase.
  • Count how many times each character appears.
  • Remove all special characters from a string.
  • Check if two strings are anagrams.
  • Replace a substring in a string without using replace().

🟫 6. LOOPS — Clear Questions

  • Find the sum of digits of a number.
  • Generate the Fibonacci series up to N terms.
  • Count how many prime numbers exist in a given range.
  • Calculate the factorial of a number using a loop.
  • Print a multiplication table for any number.
  • Count numbers divisible by both 3 and 5 in a list.
  • Reverse a number (e.g., 123 → 321).
  • Check whether a number is Armstrong.
  • Print numbers from 1 to 100 skipping multiples of 7.
  • Print a simple star pyramid.

🟨 7. FUNCTIONS — Clear Questions

  • Write a function with a default argument.
  • Write a function that returns multiple values.
  • Use lambda and filter() to keep only odd numbers from a list.
  • Write a recursive function to find factorial.
  • Write a function using *args to calculate the sum of all passed values.
  • Write a function using **kwargs to print all key-value pairs.
  • Write a function that checks if a number is perfect.
  • Write a function that counts vowels in a string.
  • Write a function that validates a password (length > 8).
  • Write a function that checks if a number is prime.

🟦 8. FILE HANDLING — Clear Questions

  • Count lines, words, and characters in a text file.
  • Copy the contents of one file into another file.
  • Remove all blank lines from a file.
  • Append a line of text to a file.
  • Read a file and print the longest line.
  • Replace a specific word in a file.
  • Count how many times a particular word appears in a file.
  • Write a list of numbers into a file.
  • Convert all text in a file to uppercase.
  • Read a CSV-like file and print the sum of numbers.

🟥 9. EXCEPTION HANDLING — Clear Questions

  • Handle division by zero using try-except.
  • Use try-except-finally to print a message.
  • Create a custom exception for invalid age.
  • Catch multiple exceptions in one block.
  • Handle invalid integer input using ValueError.
  • Raise a TypeError manually.
  • Use else block after try-except to print success message.
  • Handle FileNotFoundError.
  • Write a function that raises exception when input < 0.
  • Nested try-except example.

🟦 10. OOPS — Clear Medium Questions

  • Create a Student class that calculates and prints average marks.
  • Create an Employee class with a class variable company = "CTS".
  • Create a BankAccount class with private balance and deposit/withdraw methods.
  • Create Vehicle → Car inheritance and override start() method.
  • Use a static method to check if a number is even.
  • Use a class method to count how many objects were created.
  • Demonstrate encapsulation using getter and setter.
  • Override __str__() to print object information.
  • Create a Product class that updates price only if > 0.
  • Demonstrate method overriding with simple parent-child classes.