Python Homework

Python homework for Introduction to Computer (計算機概論), Fall 2018


In this homework, you will learn some basic techniques for Python, Git and CI/CD.

Task 0: Environment Setup


If you are using Linux, perfect! Please ignore this part.

If you are using MacOS, good for you. Don't you consider using Linux?

If you are using other operation systems (I suppose it's Windows), you will probably have some troubles for this homework.

Windows is good for many things, but not for programming. Note that TA will not answer any homework problem if you are using Windows, so please have Linux installed. Ubuntu 16.04 or 18.04 is preferred.

If you are using Windows, please choose one of the following ways to use Linux:

  1. (For Windows10 users) Use the Windows Subsystem for Linux (WSL). Instructions could be found here It is the most convinient way as you could use both Linux terminal and Windows at the same time. However, WSL dose not support CUDA drivers, which means you could not use your GPU in WSL, but GPU is not needed for this homework.
  2. (For CSIE students) Use the CSIE workstation by SSH. See NTU CSIE System Administration Team for details. This is the easiest way but you could not install packages that requires root access in the future.
  3. (For all users) Dual boot your OS with Ubuntu. Google key words like "Win10 dual boot Ubuntu". This is a bit tricky and may take a while, but you could enjoy the full utilities of Linux!
  4. (For all users) Use a portable Ubuntu USB to boot. It is ligth-weighted and you could bring your Linux everywhere, but the memory is limited.
  5. (Not suggested) Use vitual machines.
  6. (Not suggested) Borrow a laptop with Linux.

For 2 and 3, use <ctrl>+<alt>+T to open the terminal after booting your Linux.


  1. Please create a GitHub account.

    It would be better to use your NTU mail so that you would have the privilege to create private repositories. You could add an SSH key so that you don't need to verify the password every time when push/pull.

  2. Fork this repository by clicking fork on the top-right of this page.

  3. Clone your forked repository to local.

    git clone<your_github_account_name>/PythonHomework.git
    cd PythonHomework


"Package, dependency and environment management for any language—Python, R, Ruby, Lua, Scala, Java, JavaScript, C/ C++, FORTRAN" --

Conda is a very powerful package for development. You could easily switch between environments (e.g, Python2/3, Pytorch0.2/0.4.1 ...), which is extremely helpful when you are working on several projects as they may have conflicts with one another. Conda also help you solve the package dependencies.

Miniconda is a light-weighted version of Conda. Installing Miniconda for Python3.7 is highly suggested. You could use Anaconda as well but it requires way more space and time.

  1. Download installation file from Miniconda and install accrodingly, or run


    in your command line, and follow the instruction.

  2. After installation, use conda -V to check.

    It should display something like conda 4.5.11. If you found conda: command not found or similar message, it probably means you did not add the path to the conda binary to the environment variable PATH. Don't worry; just type export PATH=~/miniconda3/bin:$PATH and try it again. It would be better to add export PATH=~/anaconda3/bin:$PATH to your ~/.bashrc

  3. Create a new environment from scatch conda create -n <any name> or from file (suggested) conda env create -f environement.yaml

  4. Activate the environment by source activate <name>. Your terminal should now look like this:

    (your_environment_name) user@PC-name $

    which means you are in the environment your_environment_name now. If you want to change to another environment, type source deactivate

  5. Install Flake8 in the environment

    (your_environment_name) user@PC-name $ conda install flake8
    (your_environment_name) user@PC-name $ flake8 .

    It should prompt some warning messages regarding to Python style and syntax:

    ./src/ E902 IndentationError: unindent does not match any outer indentation level
    ./src/ E225 missing whitespace around operator
    ./src/ E999 IndentationError: unindent does not match any outer indentation level

    You need to fix them later to get the points of Flake8.

Others (optional)

The following tools would significantly improve your coding efficiency if you learn how to use it. Please at least give oh-my-zsh a try.

Task 1 - 8

Please copy src/students/ to src/students/<your student ID>.py first and edit that file.

Task 1: Basic Syntax and Flake8 Checker

Task 2: Data Types: String, Integer, Float, List, Dictionary

Task 3: Conditions

Task 4: For and While Loop

Task 5: I/O

Task 6: Function

Task 7: Class

Task 8: Modules

Repository Structure

├── client
│   ├── package.json
│   ├── package-lock.json
│   ├── public
│   │   ├── favicon.ico
│   │   ├── index.html
│   │   └── manifest.json
│   ├──
│   └── src
│       ├── App.css
│       ├── App.js
│       ├── App.test.js
│       ├── index.css
│       ├── index.js
│       ├── logo.svg
│       ├── python.png
│       ├── results.js
│       └── serviceWorker.js
├── .gitignore
├── .travis.yml
├── environment.yaml
├── netlify.toml
├── Procfile
├── requirements.txt
└── src
    ├── students 
    │   └──

client/ is for the frontend. It is written in ReactJS, based on facebook/create-react-app

src/ is for the backend and homework. The uses Flask to build a backend server. The rest are files for homework. Students should only create a file under src/students to submit their homework.

environment.yaml is for conda environemnt.

netlify.toml is for the Netlify settings. It is used to deploy the frontend.

.travis.yml is for travis CI.

Procfile is for the Heroku settings. It is used to deploy the backend.

requirements.txt is for pip environemnt, required by Heroku.


Send a Pull Request (PR) (20%)

Please send a Pull Request (PR) to the master branch.

Your PR should include only 1 file change (i.e., <your student ID>.py).

Please name the title as [status] studentID name (e.g., [test] r07944019 張雅量)

TA would review your code once you mark your PR as [Needs Review].

The CI test will tell you if your code is runnable.

If the PR is merged, you will be graded immediately for the tasks and get this 20%.

The results could be seen here

If you are not satisfied with your score, you could send another PR.

However, each following make-up PR would result in 10 points off.

Pass the tests for each task (60%)

You could use python -student_id <student ID> to see if you pass all the tasks for the public data.

You will know the score for the private data once the PR is merged.

Pass the Flake8 checker (10%)

Please use flake8 src/<student ID>.py to see if your file has passed the Flake8 checker.

Write readable code and commit message (10%)

Please write readable code and commit message.

Some examples:

Bonus (up to 50%)

1a.(Recommended) If you are using miniconda, please make sure that you have create the environment By using conda env create -f environment.yaml, you can create an environment to meet the need for this homework. To activate your environment:source activate your_environment_name

1b.If you have problem or can't install miniconda (e.g. Arm-based linux such as Raspbian),please make sure that Python3 version is 3.6 or later.You could use python3 -V to check your Python version. And if you want to install python package, we recommended to create a virtual environment first with python3 -m venv your_env_name and activate the environment with source ~/envs/your_env_name/bin/activate then use pip3 install <package_name> to install packages.

Install Packages

  1. To install Python packages, we recommended to use "conda" to install needed modules. conda install <package_name> If you have not installed miniconda, you can use pip.

Error messages

  1. To solve ModuleNotFoundError: No module named 'yaml', please make sure you have already install pyyaml by using conda install pyyaml

  2. If you are using Python 2.7, you might got an error message:

    File "", line 70

assert os.path.exists(student_file), f"{student_file} not exists" ^ SyntaxError: invalid syntax

### Git

#### Clone

If you want to clone a remote repository (e.g. Github) to local, you can use `git clone`

a. Clone via SSH (Recommended)

To use SSH to clone, please read the article first:


$ git clone

b. clone via Https

$ git clone

No matter which method you choose to use, you may see some message like:

Cloning into 'repo_name'... remote: Enumerating objects: 669, done. remote: Total 669 (delta 0), reused 0 (delta 0), pack-reused 669 Receiving objects: 100% (669/669), 600.65 KiB | 335.00 KiB/s, done. Resolving deltas: 100% (368/368), done. Checking connectivity... done.

It will create a directory <repo_name> under your current directory, and you can modify the files now.

#### Commit && Push

If you want to store current contents of the index, you can use `git commit`
Before making a commit, you *should* add modified files first, using `git add <file_name>`
After adding modified files, you can make a commit to describe what you change in the repo.

If you only want to describe the commit only, you can use `git commit -m "your_message"`

After making a commit, you can push your commit to remote by using `git push origin <branch_name>`
Note:Default name of the branch is *master*
So that your remote repository will be up-to-date with your local repository.


$ git add $ git commit -m "Pass task 1" [master ba496b5] Pass task 1 1 file changed, 2 insertions(+) create mode 100644 $ git push Counting objects: 3, done. Delta compression using up to 4 threads. Compressing objects: 100% (2/2), done. Writing objects: 100% (3/3), 303 bytes | 0 bytes/s, done. Total 3 (delta 0), reused 0 (delta 0) To 608fe24..ba496b5 master -> master

#### Update local and remote repository

Since this repository is frequently updated, you may need to update your repository to latest version but also keep your changes. To do this:

Set 'upstream' to the original repo

$ git remote add upstream

Change to the branch you want to update. If you are already in that branch, this command is not needed.

$ git checkout

Fetch data from the remote

$ git fetch upstream master

Rebase current branch on the latest remote branch

$ git rebase upstream/master

If you only modify `src/students/<student-id>.py`, conflicts should not happen. If there are conflicts, just fix it and use `git add <conflicted-file>` and `git rebase --continue` to complete rebase.

After rebase your local git, `git push` may not work since your git tree has changed. Use `git push -f` to force push to remote instead. Notice that **don't** use this command to a branch if there are somebody else is using this branch, unless you exactly know what you are doing.

To read more: [merging vs rebasing](

#### Advanced Operation
1. Merge Multiple Commits into One Commit
2. Send PR with only one commit

## License


## Author

Ya-Liang Chang (Allen) [amjltc295]( - **Homework design, backend, frontend, CI/CD**