Code now, master Python instantly. Learn offline, anywhere.
A cyberpunk-styled Python learning terminal that fits in your pocket: embedded real CPython interpreter, 30-level gamified curriculum, auto-grading with assert, variable visualization, and six-tier progression system.
🎬 Trailer · ⚡ TL;DR · 📊 How it runs · 📥 Download · Curriculum · ⭐ Star
▶ Click the poster to watch · open video directly (MP4, 1080×1920, ~50s, original synth soundtrack)
🌐 Online download page — screenshots, videos and QR download on your phone, no account needed
| You Ask | One-Line Answer |
|---|---|
| Does it work offline? | ✅ Truly offline — a full CPython 3.13 interpreter is embedded in the APK; code, run and get graded in subway tunnels |
| Will I actually learn to code? | ✅ Assert auto-grading — you don't advance until test cases pass; cures "understood but can't write" |
| Ads? Account? Tracking? | ✅ Zero ads · zero account · zero data upload, MIT-licensed — safe to recommend to students |
| Anything unique? | 🔬 Variable Snapshot panel (whole namespace visualized after each run) · Six Tiers · Daily Quests · Mistake Book |
| How much content? | 📚 30 main lessons + 10 algorithm bonus lessons, from print to decorators, plus 6 Arena challenges |
🎯 One-line pitch: not another blank code editor — a pocket learning terminal that bundles a CPython interpreter + grading engine + game-like progression, fully offline.
Others rely on cloud execution and die without a network. PY//NOW embeds a complete CPython 3.13 interpreter right into the APK — every line of code runs on this phone. Here is the runtime chain:
flowchart TD
UI["📱 Jetpack Compose UI<br/>Cyber HUD · Five-Tab Nav"] -->|"JSON Bridge PyBridge"| KT["⚙️ Kotlin Business Layer<br/>Progress / Theme / Grading"]
KT -->|"Chaquopy 17.0.0"| PY["🐍 CPython 3.13 Runtime"]
PY --> RUN["runner.py · Safe Sandbox<br/>Dead-loop Watchdog · input Takeover"]
PY --> REPL["repl.py · Stateful Session<br/>↑↓ History · Multi-line"]
RUN --> OUT["📊 Variable Snapshot + Grade"]
REPL --> OUT
OUT -->|"Save Progress"| DS[("💾 DataStore")]
OUT -->|"Drive UI"| UI
KT --> DS
classDef neon fill:#0A0E17,stroke:#00E5FF,color:#E6F6FF;
classDef green fill:#06281F,stroke:#00FF9C,color:#D6FFF0;
classDef pink fill:#2A0A18,stroke:#FF2D78,color:#FFD9E7;
class UI,KT neon;
class PY,RUN,REPL green;
class OUT pink;
Network is used only when you manually fetch course packs in "Content Hub" (sha256-verified, zero personal data). Learning, coding, and grading are 100% offline.
Not "watch a video → forget". A closed loop that forces you to write: type → run → grade → coach if failed → tier up only when passed.
flowchart LR
W["✍️ Write Code"] --> R["▶ Run"]
R --> G{"assert Grading"}
G -- "Pass" --> U["⚡ Tier Up +XP"]
G -- "Fail" --> C["🧭 L0 Rule Coach<br/>Diagnose → 3 Steps → Fix Example"]
C --> W
U --> W
pie title Content Scale (lessons / items)
"30 Main Lessons" : 30
"10 Algorithm Bonus" : 10
"6 Arena Challenges" : 6
"47 assert Graders" : 47
Level up like a game — from "Script Kiddie" all the way to "System Architect":
flowchart LR
T1["🥉 Script Kiddie"] --> T2["🥈 Data Ghost"] --> T3["🥉 Network Ronin"] --> T4["🥇 Cyber Hacker"] --> T5["🏆 Street Legend"] --> T6["👑 System Architect"]
Each tier unlocks a new title + neon achievement wall. Complete every course to earn a Graduation Certificate (neon cert page, screenshot to share).
| Home | Lessons | Lesson Detail |
|---|---|---|
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| Themes | Profile | Arena |
|---|---|---|
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| Welcome |
|---|
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▶ Click to watch · open video directly (MP4, 1080×1920, ~57s)
| You Are | You Get |
|---|---|
| Beginner / Career Changer | 30 Chinese narrative lessons, from print to decorators |
| Commuter / Fragmented Learner | Fully offline, code even in subway tunnels |
| Teacher / Parent | No ads, no account, zero data upload — safe for students |
| Developer | Complete Compose + Chaquopy reference implementation, MIT-licensed |
| Others | PY//NOW | |
|---|---|---|
| Code Execution | ☁️ Cloud-based, dead without net | 📱 On-device CPython 3.13 |
| Teaching Style | Dry documentation | Cyber narrative + life analogies + pop quizzes |
| Runtime Feedback | Black-box print | Variable Snapshot Panel + instant result display |
| Growth Motivation | Check-in calendar | XP / Six Tiers / Daily Quests / Achievement Wall |
- ✅ Assert Grading — must pass test cases to advance, preventing "understood but can't code"
- ✍️ Fill-in-the-Blank + 🧩 Code Sorting — Mimo-style low-barrier exercises: type missing fragments / sort shuffled lines into a correct program
- 🧭 L0 Rule Coach — on-error guidance: offline rules give "diagnosis → 3 steps → fix example"; hints never write the code for you
- 📖 Mistake Book + Spaced Repetition — wrong answers auto-collected; reviewed on a day/1d/3d/7d… schedule
- 🧭 Hand-holding Guidance — each lesson: life analogy → ASCII diagram → TASK follow-along → PRACTICE hands-on → STEPS thinking card
- 🔌 Offline CPython 3.13 — Chaquopy-embedded real interpreter; network only for Content Hub course packs (sha256 verified, zero personal data)
- 🛡 Sandbox Security — dead-loop watchdog force-interrupt, input queue takeover for
input(), friendly localized exceptions - 🎹 Code Editor — neon Python syntax highlighting, smart indentation (
:auto-indent), Tab-to-space - 🖥 Neural Interface REPL — stateful session, ↑↓ history, multi-line blocks, one-tap reset
- 🔬 Variable Snapshot — every variable's name/type/value in the namespace, shown after each run
- 🏆 Six Tiers — Script Kiddie → Data Ghost → Network Ronin → Cyber Hacker → Street Legend → System Architect
- ⚡ Daily Quests / XP / Streak — a goal every day, feedback on every run
- 📦 Content Hub — course pack system: Built-in Function Tour bonus + DSA Basics/Mastery packs (10 lessons), download and learn on demand
- 🎓 Graduation Certificate — neon certification page unlocked upon completing all courses, screenshot to share
- 🎨 6 Color Themes — Cyber Neon / Deep Space Gray / Aurora Green / Twilight Purple / Twilight Orange / Paper White, instant switch without restart
- 👓 Readability-First UI — effects confined to decoration zones (boot/home/terminal…); lesson body and graded results use larger sans-serif text, no gimmicks
- ⚡ In-App Self-Update — check for new versions in Settings, pull from GitCode repo, verify SHA-256, install via system installer
⚡ Fastest path → 🌐 Online download page: scan or tap, with trailer, screenshots and install guide. 🛰 GitHub Pages mirror → x33834.github.io/mashang-python (same page + architecture visuals)
Android 7.0+ (minSdk 24), arm64-v8a / x86_64 dual architecture. Release builds are R8-minified.
- ⭐ Recommended: download the latest
pynow-*.apkfrom Releases (GitCode) - Build yourself:
./gradlew :app:assembleDebug # Debug build
./gradlew :app:bundleRelease # Store AAB (requires keystore.properties)
python tests/test_engine_desktop.py # Engine unit tests
python tests/validate_content.py # Full curriculum × answer key validationQ: Is it really fully offline? What's the network permission for? Learning, coding, and grading are 100% offline. Network is only used when manually checking/downloading new course packs in "Content Hub", with zero personal data transmitted.
Q: How is this different from Pydroid3 or other IDEs? Pydroid is a development tool; we're a "curriculum-as-code" learning terminal—each lesson comes with graded challenges and a growth system. Our goal is to teach you, not just give you a blank editor.
Q: Will there be an iOS version? The tech stack (Chaquopy) only supports Android; iOS would require a different approach and is on the long-term roadmap.
Q: Can I use the curriculum commercially? Yes. The project is open-sourced under the MIT License — free to use, modify, and distribute, including commercial use, as long as the license notice is retained. See LICENSE for the full terms.
Act I · Foundation Protocol (click to collapse)
01 First Handshake · 02 Variables & Types · 03 String Operations · 04 Numeric Protocols · 05 Input Signals · 06 Conditional Branching Matrix · 07 Loop Engines · 08 List Warehouses · 09 Dictionary Key Vaults · 10 Foundation Graduation
Act II · Advanced Gear
11 String Toolbox · 12 Tuples & Sets · 13 Function Evolution (*args/**kwargs) · 14 Comprehension Storm · 15 Exception Shields · 16 Data Persistence (Files/JSON) · 17 Module Summoning · 18 Class & Object Awakening
Act III · High-Tier Implants
19 Inheritance & Magic Methods · 20 Capstone Project · Cyber Bank · 21 Generator Engines · 22 Decorator Suits · 23 Lambda Trio · 24 Standard Library Combat (Counter/re) · 25 Time & Random Universe · 26 Graduation Project · Log Analyzer · 27 Easter Egg · Built-in Function Tour (Content Hub Exclusive)
Final Act · Beyond the Boundary — Master Python core here:
28 File I/O Protocols · 29 Custom Exceptions · 30 Modules & Main Guard (__main__)
Each lesson includes: Runnable Example + OUTPUT Preview + Diagram/Table + QUIZ Pop Question + Assert Grading Challenge Plus Arena 6 Major Challenges: Neon Counter / Palindrome Detector / Password Strength Firewall / Bracket Firewall / Run-Length Compressor / Inventory Manager.
Kotlin + Jetpack Compose (Material3 Cyber Custom Theme)
│ JSON Bridge PyBridge
Chaquopy 17.0.0 ──► CPython 3.13 (runner.py sandbox / repl.py session)
DataStore Progress │ Navigation Single-Activity Five-Tab │ Custom Syntax Highlighter
See the How It Runs architecture diagram above for the visual runtime chain.
- v0.1 MVP: engine loop + 7 screens + grading
- v0.2 content explosion: 26 lessons + 4 new content blocks (table/diagram/quiz/output preview)
- v0.2.1 Content Hub: online course-pack download (client-cloud), first pack "Built-in Function Tour"
- v0.3 milestone: DSA bonus packs ×2 (10 lessons), L0 offline rule coach, mistake book + spaced repetition, UI readability cleanup
- v0.3 remaining: turtle canvas · matplotlib output · runtime variable animation
- v0.4 on-device AI tutor (online LLM) · multi-language · tablet layout
- v1.0 full app-store distribution
All forms welcome: new lesson content, bug reports, UI polish, multi-language translations.
Fork → New branch → Submit PR; for course content, please update answer keys in tests/validate_content.py and ensure all PASS.
This repository is published under the MIT License — free to use, modify, and distribute for any purpose (personal, educational, or commercial), provided the license notice is retained.
- ✅ You may view, study, modify, redistribute, and build commercial products upon it.
- ✅ No warranty is provided; use at your own risk.
- ™ "PY//NOW" / "码上Python" names and logos remain reserved trademarks.
Third-party components: Chaquopy (MIT), Jetpack Compose (Apache-2.0).