questions.md

🐍 Python 300 Challenge 🚀

Master Python fundamentals in 30 days by solving 300 questions 👉 Focus: Lists, Strings, Dictionaries, Functions & File Handling

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📅 Rules

• Solve 10 questions daily
• Total: 300 questions in 30 days
• If you miss a day → cover backlog next day
• Try without help first, then debug & improve

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✅ Progress Tracker

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Week 1 — Lists (Day 1–7)

Day 1

• Print all elements of a list
• Find length of a list
• Find maximum number
• Find minimum number
• Sum all elements
• Count even numbers
• Count odd numbers
• Reverse a list
• Remove duplicates
• Find second largest number

Day 2

• Take 5 inputs and store in list
• Print list in reverse order
• Print first element
• Print last element
• Print elements at even index
• Print elements at odd index
• Check if element exists
• Count occurrences of element
• Find sum of first & last
• Find difference max-min

Day 3

• Count positive numbers
• Count negative numbers
• Multiply all elements
• Find average
• Find largest without max()
• Find smallest without min()
• Remove negative numbers
• Create square list
• Create cube list
• Separate even & odd

Day 4

• Merge two lists
• Find common elements
• Remove element by index
• Remove element by value
• Find index of largest
• Rotate list left
• Rotate list right
• Sort list (no sort())
• Find second smallest
• Find third largest

Day 5

• Find all duplicates
• Find unique elements
• Flatten nested list
• Split list into halves
• Running sum
• Cumulative product
• Find median
• Find mode
• Implement bubble sort
• Implement selection sort

Day 6

• Find pair with given sum
• Find pair with max product
• Check palindrome list
• Rotate list N times
• Find intersection
• Find union
• Find difference
• Check equal lists
• Subset check
• Count frequency manually

Day 7

• Remove duplicates (no set)
• Sort descending
• Swap first & last
• Shift zeros to end
• Move negatives to front
• Find missing number
• Find repeating number
• Find peaks in list
• Split into chunks
• Longest increasing subsequence (basic)

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Week 2 — Strings (Day 8–14)

Day 8

• Reverse a string
• Count vowels
• Count consonants
• Check palindrome
• Remove spaces
• Replace characters
• Convert to uppercase
• Convert to lowercase
• Count words
• Find longest word

Day 9

• Print characters line by line
• Count uppercase
• Count lowercase
• Count digits
• Count special characters
• Remove digits
• Remove punctuation
• ASCII values
• Replace space with _
• First non-repeating char

Day 10

• First repeating character
• Most frequent character
• Remove duplicate chars
• Sort characters
• Check anagram
• Count substring
• Longest unique substring
• Swap first & last char
• Remove first occurrence
• Remove last occurrence

Day 11

• Capitalize words
• Reverse each word
• Find shortest word
• Words starting with vowel
• Words longer than N
• Replace vowels with *
• Count sentences
• String → list
• List → string
• Find substring index

Day 12

• Run-length encoding
• String compression
• Rotation check
• Remove consecutive duplicates
• Longest palindrome substring
• Only alphabets check
• Only digits check
• Mask email
• Format phone
• Password validation

Day 13

• Count repeating words
• Remove stop words
• Find word frequency
• Replace word
• Count punctuation
• Extract numbers
• Extract emails
• Extract hashtags
• Remove extra spaces
• Title case

Day 14

• Caesar cipher
• Reverse sentence order
• Find longest prefix
• Find longest suffix
• Compare strings ignoring case
• Remove substring
• Count overlapping substrings
• Find mirrored string
• String interleaving
• Validate IP format

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Week 3 — Dictionaries (Day 15–21)

Day 15

• Create dictionary
• Print keys
• Print values
• Print key-value pairs
• Count keys
• Check key exists
• Update value
• Remove key
• Clear dictionary
• Copy dictionary

Day 16

• Merge dictionaries
• Max value
• Min value
• Sum values
• Multiply values
• Count even values
• Count odd values
• Dict → list
• List → dict
• Squares dictionary

Day 17

• Student marks
• Average marks
• Topper
• Word frequency
• Character frequency
• Most frequent word
• Least frequent word
• Group by length
• Phonebook
• Search contact

Day 18

• Nested dictionary
• Employee data
• Sort by keys
• Sort by values
• Duplicate values
• Invert dictionary
• Count list freq
• Merge same keys
• Create from lists
• Dict comprehension

Day 19

• Inventory system
• Voting system
• Library system
• Attendance tracker
• Student grading
• Expense tracker
• Product catalog
• Shopping cart
• Bank system
• Quiz system

Day 20

• Group anagrams
• Frequency sort
• Key with max length
• Key with min length
• Flatten nested dict
• Nested sum
• Deep copy dict
• Count nested keys
• Merge nested dict
• Filter dictionary

Day 21

• Reverse mapping
• Dict difference
• Dict intersection
• Sort nested dict
• Most common pair
• Least common pair
• Group by first letter
• Group by last letter
• Count unique values
• Remove duplicate values

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Week 4 — Functions & File Handling (Day 22–30)

Day 22

• Prime function
• Factorial
• Fibonacci
• Armstrong
• Perfect number
• GCD
• LCM
• Random number game
• Calculator
• Guess number

Day 23

• Even/odd function
• Positive/negative
• Max of two
• Min of three
• Swap numbers
• Square function
• Cube function
• Power function
• Sum of digits
• Reverse number

Day 24

• Count digits
• Multiplication table
• Prime list
• Factorial list
• Fibonacci list
• Remove duplicates (function)
• Sort list (function)
• Count vowels
• Count consonants
• Count words

Day 25

• Longest word function
• Shortest word
• Palindrome string
• Anagram check
• Frequency counter
• List average
• List median
• List mode
• List rotation
• List intersection

Day 26

• Create file
• Write file
• Read file
• Read line by line
• Count lines
• Count words
• Count characters
• Append file
• Copy file
• Longest line

Day 27

• Shortest line
• Word frequency file
• Character frequency
• Most frequent word
• Replace word
• Remove blank lines
• Uppercase file
• Lowercase file
• Count vowels
• Count digits

Day 28

• Reverse lines
• Sort file content
• Merge files
• Split file
• Find duplicates
• Search word
• Count sentences
• Extract emails
• Extract numbers
• File stats

Day 29

• Todo app
• Contact book
• Quiz game
• Password generator
• Story generator
• Word guessing game
• Grade manager
• Notes system
• Calculator app
• Random story

Day 30

• File search tool
• Log analyzer
• Text stats tool
• Password file generator
• Email cleaner
• Duplicate finder
• Text adventure game
• Word ladder
• Sudoku validator
• Spell checker

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🎯 Goal

✔ Build strong Python fundamentals ✔ Think logically ✔ Write clean code daily

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🔥 Consistency > Perfection