Python 100 Days Marathon

Welcome to my 100 Days of Python repository! This project documents my 100-day journey of writing Python code every single day. The goal of this marathon was to build a strong foundation in Python by solving progressively challenging programming problems.

About the Project

This repository contains exactly 100 Python scripts, one for each day. The difficulty scales up over time, starting from very basic logic and arithmetic, and culminating in interactive, terminal-based applications that utilize file handling and data structures.

Topics Covered

Over the course of 100 days, these practice codes cover a wide range of core Python concepts:

Basics: Variables, I/O (input() and print()), Type Casting
Control Flow: if-elif-else conditions, for and while loops
Data Structures: Strings, Lists, Tuples, Sets, and Dictionaries
Functions: Definition, Default Arguments, Returning Multiple Values
Error Handling: try-except blocks for safe execution
File I/O: Reading, Writing, and appending to .txt and .json files
Modules: Using random, datetime, os, and json

Highlighted Projects

Here are a few of the more complex projects built in the later days of the marathon:

097. File-Based Contact Book.py: A terminal contact book that persists data to a local text file.
098. JSON Student Database.py: An interactive database that stores and retrieves student records using JSON.
099. Command-Line Expense Tracker.py: A CLI app to log expenses, calculate totals, and save financial data.
100. Build a CLI Python Calculator.py: The grand finale - a fully featured, error-handled calculator with an interactive menu and saved calculation history.

How to Run

All scripts are standalone and require no external libraries. You can run any of them directly using standard Python 3.

# Clone the repository
git clone https://github.com/Hero-Harshit/python-marathon-100-days.git

# Navigate into the directory
cd python-marathon-100-days

# Run a specific day's script
python "100. Build a CLI Python Calculator.py"

Name		Name	Last commit message	Last commit date
001. Add Two Numbers.py		001. Add Two Numbers.py
002. Basic Calculator.py		002. Basic Calculator.py
003. Area of a Rectangle.py		003. Area of a Rectangle.py
004. Celsius to Fahrenheit.py		004. Celsius to Fahrenheit.py
005. Swap Two Variables.py		005. Swap Two Variables.py
006. Calculate Simple Interest.py		006. Calculate Simple Interest.py
007. Average of Three Numbers.py		007. Average of Three Numbers.py
008. Calculate Total and Percentage.py		008. Calculate Total and Percentage.py
009. Convert Minutes to Hours.py		009. Convert Minutes to Hours.py
010. Last Digit.py		010. Last Digit.py
011. Positive, Negative, or Zero.py		011. Positive, Negative, or Zero.py
012. Even or Odd.py		012. Even or Odd.py
013. Largest of Two Numbers.py		013. Largest of Two Numbers.py
014. Largest of Three Numbers.py		014. Largest of Three Numbers.py
015. Voting Eligibility.py		015. Voting Eligibility.py
016. Check Leap Year.py		016. Check Leap Year.py
017. Grade Calculator.py		017. Grade Calculator.py
018. Divisibility Checker.py		018. Divisibility Checker.py
019. Simple Login.py		019. Simple Login.py
020. Electricity Bill.py		020. Electricity Bill.py
021. Print Numbers.py		021. Print Numbers.py
022. Print Even Numbers.py		022. Print Even Numbers.py
023. Print Multiples.py		023. Print Multiples.py
024. Sum from 1 to N.py		024. Sum from 1 to N.py
025. Count Digits.py		025. Count Digits.py
026. Reverse a Number.py		026. Reverse a Number.py
027. Multiplication Table.py		027. Multiplication Table.py
028. Count Even and Odd Numbers.py		028. Count Even and Odd Numbers.py
029. Running Total.py		029. Running Total.py
030. Password Attempts.py		030. Password Attempts.py
031. Star Pattern.py		031. Star Pattern.py
032. Reverse Star Pattern.py		032. Reverse Star Pattern.py
033. Number Pattern.py		033. Number Pattern.py
034. Multiplication Grid.py		034. Multiplication Grid.py
035. Character Pattern.py		035. Character Pattern.py
036. String Length.py		036. String Length.py
037. First and Last Character.py		037. First and Last Character.py
038. String Slicing.py		038. String Slicing.py
039. Reverse a String.py		039. Reverse a String.py
040. Count a Character.py		040. Count a Character.py
041. Convert Case.py		041. Convert Case.py
042. Remove Spaces.py		042. Remove Spaces.py
043. Replace a Word.py		043. Replace a Word.py
044. Check for a Substring.py		044. Check for a Substring.py
045. Count Vowels.py		045. Count Vowels.py
046. Count Words.py		046. Count Words.py
047. Username Generator.py		047. Username Generator.py
048. Palindrome String.py		048. Palindrome String.py
049. Character Frequency.py		049. Character Frequency.py
050. Basic Text Analyzer.py		050. Basic Text Analyzer.py
051. Create a List.py		051. Create a List.py
052. Sum of List.py		052. Sum of List.py
053. Find Largest Element.py		053. Find Largest Element.py
054. Find Smallest Element.py		054. Find Smallest Element.py
055. Count Occurrences.py		055. Count Occurrences.py
056. Remove Duplicates.py		056. Remove Duplicates.py
057. Reverse a List.py		057. Reverse a List.py
058. List Filtering.py		058. List Filtering.py
059. Separate Even and Odd.py		059. Separate Even and Odd.py
060. List Statistics.py		060. List Statistics.py
061. Search in a List.py		061. Search in a List.py
062. Merge Two Lists.py		062. Merge Two Lists.py
063. Common Elements.py		063. Common Elements.py
064. Shopping List.py		064. Shopping List.py
065. Student Marks List.py		065. Student Marks List.py
066. Tuple Basics.py		066. Tuple Basics.py
067. Tuple Unpacking.py		067. Tuple Unpacking.py
068. Remove Duplicates Using a Set.py		068. Remove Duplicates Using a Set.py
069. Set Operations.py		069. Set Operations.py
070. Word Set.py		070. Word Set.py
071. Student Dictionary.py		071. Student Dictionary.py
072. Dictionary Lookup.py		072. Dictionary Lookup.py
073. Update Dictionary.py		073. Update Dictionary.py
074. Phone Book.py		074. Phone Book.py
075. Word Frequency Dictionary.py		075. Word Frequency Dictionary.py
076. Your First Function.py		076. Your First Function.py
077. Temperature Converter Function.py		077. Temperature Converter Function.py
078. Even-Odd Function.py		078. Even-Odd Function.py
079. Calculator Functions.py		079. Calculator Functions.py
080. String Utility Functions.py		080. String Utility Functions.py
081. Default Arguments.py		081. Default Arguments.py
082. Function Returning Multiple Values.py		082. Function Returning Multiple Values.py
083. Password Validator Function.py		083. Password Validator Function.py
084. Menu-Driven Function Program.py		084. Menu-Driven Function Program.py
085. Safe Division.py		085. Safe Division.py
086. Safe Integer Input.py		086. Safe Integer Input.py
087. Handle Multiple Errors.py		087. Handle Multiple Errors.py
088. Random Number Game.py		088. Random Number Game.py
089. Random Password Generator.py		089. Random Password Generator.py
090. Date and Time Display.py		090. Date and Time Display.py
091. Temperature Utility Module.py		091. Temperature Utility Module.py
092. Unit Converter.py		092. Unit Converter.py
093. Write to a File.py		093. Write to a File.py
094. Read a File.py		094. Read a File.py
095. File Statistics.py		095. File Statistics.py
096. Simple Notes Application.py		096. Simple Notes Application.py
097. File-Based Contact Book.py		097. File-Based Contact Book.py
098. JSON Student Database.py		098. JSON Student Database.py
099. Command-Line Expense Tracker.py		099. Command-Line Expense Tracker.py
100. Build a CLI Python Calculator.py		100. Build a CLI Python Calculator.py

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