Rust Lesson 4: Structs and Enums
Model data with structs and impl blocks, enums with data, and match to handle every case — the patterns behind most Rust programs.
Read article →Coding
Start-to-finish programming for people who work with data: Python, SQL, Java, R, JavaScript, Rust and PowerShell.
Rust Lesson 3: Ownership and Borrowing
Rust Lesson 3: Ownership and Borrowing
Rust’s core idea explained simply: each value has one owner, moves, borrowing with & and &mut, and why this removes whole classes of bugs.
Read article →Rust Lesson 2: Variables, Mutability and Types
Rust Lesson 2: Variables, Mutability and Types
Rust variables are immutable by default: let and let mut, integer and float types, casting with as, string slices vs String, and formatted printing.
Read article →Rust Lesson 1: Install Rust and Cargo
Rust Lesson 1: Install Rust and Cargo
Install Rust with rustup, create a project with cargo new, build and run with cargo run, and understand Cargo.toml and src/main.rs.
Read article →Python Intermediate Lesson 10: Project – A Monthly Report Pipeline
Python Intermediate Lesson 10: Project – A Monthly Report Pipeline
Final project: read every monthly CSV in a folder, combine, enrich with products and customers, compute KPIs and write a multi-sheet Excel report with…
Read article →Python Intermediate Lesson 9: Command-Line Tools With argparse
Python Intermediate Lesson 9: Command-Line Tools With argparse
Turn a script into a reusable tool with options and help text using argparse, and run it from a batch file or Windows Task…
Read article →Python Intermediate Lesson 8: JSON and APIs
Python Intermediate Lesson 8: JSON and APIs
Read and write JSON, call a REST API with requests, check status codes and handle errors, and convert rupees to other currencies from an…
Read article →Python Intermediate Lesson 7: Formatted Excel Reports With openpyxl
Python Intermediate Lesson 7: Formatted Excel Reports With openpyxl
Write Excel files people like to open: several sheets, live formulas, header styles, number formats, frozen panes and a chart, all from Python with…
Read article →Python Intermediate Lesson 6: Regular Expressions for UPI, GSTIN and PAN
Python Intermediate Lesson 6: Regular Expressions for UPI, GSTIN and PAN
Use Python regex with named groups to parse UPI bank narrations and validate GSTIN, PAN and phone numbers, with patterns explained piece by piece.
Read article →Python Intermediate Lesson 5: pandas in Depth – Merge, GroupBy and Pivot Tables
Python Intermediate Lesson 5: pandas in Depth – Merge, GroupBy and Pivot Tables
Clean types with to_datetime and to_numeric, merge three tables, use named aggregations in groupby and build pivot tables, avoiding the duplicate-column trap.
Read article →Python Intermediate Lesson 4: Dates, Formats and the Indian Financial Year
Python Intermediate Lesson 4: Dates, Formats and the Indian Financial Year
Parse and format dates with strptime and strftime, compute FY labels and quarters, add working days with holidays and find month ends with datetime.
Read article →Python Intermediate Lesson 3: Errors, try/except and Logging
Python Intermediate Lesson 3: Errors, try/except and Logging
Process files with bad rows without crashing: catch specific exceptions, log what was skipped and why, and use finally for clean-up.
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