Slides

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# Intro to Python

## Week 4 (Tues)

### Review & Practice

1. Your python toolbox
2. `turtle`
3. GitLab.com
4. `this`, `ipython`, and `__name__`

note:

1. First we'll review your Python toolbox
2. Then we'll review the boss level homework 
3. You'll set up and practice using _GitLab.com_
4. last week: `self`, this week: `this`

---

### Toolbox (Review)
 
- `bash ` - Git-Bash or Shell prompt (`$ `)
- `python ` - interactive Python console (`>>> `)
- `subl ` - Sublime Text project (`~/code/` in title bar)

note: 
- During class you should always have a Terminal window open with an interactive Python interpreter running
- I love it when I show you a new command in the slides and I see you playing with it in your Terminal

---

## Websites
- *Canvas* - assignments and quizzes
- *Runestone.Academy* - interactive textbook
- [``nlpia.org``](https://nlpia.org/fall26) - classroom slides and notes
- [``proai.org``](https://bash.proai.org) - *GameShell*
- [``wikipedia.org``](https://en.wikipedia.org) 
- [``GitLab.com/mesa_python/fall26``](https://GitLab.com/mesa_python/fall26)

note:
- This is mostly for our guest professor
- You have been submitting assignments each week in Canvas and Runestone
- In class I use the course slides (nlpia.org) to keep us on track during class
- You used GameShell (proai.org) to practice your Bash and Python skills

- Sometimes I'll create websites or educational games to make things more fun

---

## Search

- [``Google.com``](https://en.wikipedia.org)
- [``ChatGPT.com``](https://en.wikipedia.org)
- [``Claude.ai``](https://en.wikipedia.org)

[![meatproxy.me](./wk4/meat-proxy.svg)](https://meatproxy.me)

note:
- It's not cheating, but you are cheating yourself
- Our authenticity is your main advantage against AI
- Be the hero, not the meat proxy

---

## Proxy

---

#### Don't be a
 
## Prompt Forwarder

---

#### Don't be a
 
## Conveyor Belt

---

#### Don't be a
 
## ``Ctrl-V`` Engineer

---

#### Don't be a
 
## Human _Bottleneck_

---

#### Don't be a
 
## _Latency_ Generator

---

## Turtle

#### Write a function to draw a rectangle

---

```bash
$ python [ENTER]
```
```python
>>> import turtle
>>> turtle.  # [TAB] key
```

[![](./wk4/turtle-tab.png)](./wk4/turtle-tab.png)

---

```python
>>> import turtle
>>> screen = turtle.Screen()
>>> timmy = turtle.Turtle()
>>> timmy.  # [TAB][TAB]
```

---

```python
>>> import turtle
>>> screen = turtle.Screen()
>>> timmy = turtle.Turtle()
>>> timmy.forward(100)

```

---

```python
>>> import turtle
>>> screen = turtle.Screen()
>>> timmy = turtle.Turtle()
>>> timmy.forward(100)
>>> timmy.left(90)

```

---

```python
>>> import turtle
>>> screen = turtle.Screen()
>>> timmy = turtle.Turtle()
>>> timmy.forward(100)
>>> timmy.left(90)
>>> timmy.forward(50)
>>> timmy.left(90)

```

---

```python
>>> import turtle
>>> screen = turtle.Screen()
>>> timmy = turtle.Turtle()
>>> timmy.forward(100)
>>> timmy.left(90)
>>> timmy.forward(50)
>>> timmy.left(90)
>>> timmy.forward(100)
>>> timmy.left(90)
>>> timmy.forward(50)
>>> timmy.left(90)
```

---

```python
>>> import turtle
>>> screen = turtle.Screen()

>>> def draw_rect():
...     timmy = turtle.Turtle()
...     timmy.forward(100)
...     timmy.left(90)
...     timmy.forward(50)
...     timmy.left(90)
...     timmy.forward(100)
...     timmy.left(90)
...     timmy.forward(50)
...     timmy.left(90)
```

---

```python
>>> def draw_rect(timmy, x, y):  # why not `, angle)`
...     timmy.forward(x)  # why not `l`? why not `length`
...     timmy.left(90)    # why not `angle`
...     timmy.forward(y)
...     timmy.left(90)
...     timmy.forward(x)
...     timmy.left(90)
...     timmy.forward(y)
...     timmy.left(90)
```

note:
- Any undefined variables?
- This is not clean code

---

```python
>>> def draw_rect(x, y):  # why not `, angle)`
...     timmy.forward(x)  # why not `l`? why not `length`
...     timmy.left(90)    # why not `angle`
...     timmy.forward(y)
...     timmy.left(90)
...     timmy.forward(x)
...     timmy.left(90)
...     timmy.forward(y)
...     timmy.left(90)
```

---

>>> timmy.forward(100)
>>> timmy.left(90)
>>> timmy.forward(50)
>>> timmy.left(90)
>>> timmy.forward(100)
>>> timmy.left(90)
>>> timmy.forward(50)
>>> timmy.left(90)

---

```python
def draw_rectangle():
    import turtle
    screen = turtle.Screen()
    timmy = turtle.Turtle()
    timmy.forward(100)
```

note:
- this meets the requirements of the assignment
- but it's poor style
- and not a very useful or reusable function
`
---

```python
def draw_rectangle()
    import turtle              # move import to top of module
    screen = turtle.Screen()
    timmy = turtle.Turtle()
    timmy.forward(100)
    timmy.left(90)
    timmy.forward(50)
    timmy.left(90)
    timmy.forward(100)
    timmy.left(90)
    timmy.forward(50)
    timmy.left(90)
```

---

```python
import turtle

def draw_rectangle()
    screen = turtle.Screen()  # not needed
    timmy = turtle.Turtle()
    timmy.forward(100)
    timmy.left(90)
    timmy.forward(50)
    timmy.left(90)
    timmy.forward(100)
    timmy.left(90)
    timmy.forward(50)
    timmy.left(90)
```

---

## `git`

### **V**ersion **C**ontrol **S**ystem

#### Keep track of changes to files

---

## GitLab.com
 
- Website to manage `git` projects (*repositories*)
- Automatically check your files for syntax and style errors
- Can run your program files to help find logic and runtime errors

---

## Attendance

- Review class notes or code or python history
 - in Python:   `>>> ` ⬆ (up arrow)
 - in Sublime Text:   <kbd class="keyboard-key" about="#mwt169">Ctrl</kbd>+<kbd class="keyboard-key">Shift</kbd>+<kbd class="keyboard-key">F</kbd>

- Think of some new computer science terms you've learned
- At the whiteboard, write your name and a term not already on the board

note:

- Be prepared to explain it or use it in a sentence.

---

## Lab Assignment

1. Check your @student.sdccd.edu e-mail
2. Look for an invitation to join GitLab
3. Click on the link to go to GitLab.com in your browser
4. Create an _Free_ account using your `@student.sdccd.edu` email
5. Click the ``[+]`` menu at the top of the page near your profile
  - Create a new project named `python_code` or `python_practice` or whatever you like
  - Select the "group" with your username for your new project
  - Make it public to share it with friends or employers
6. On your project folder at ``f'gitlab.com/{your_gitlab_username}/{your_project_name}'`` click the ``[+]`` 
  - click "Upload" and select a Python program file from your computer
  - click "New file" and paste your code into a new file
  - make sure the file is named ``"*.py"``
  - IMPORTANT: click the blue ``[Commit]`` to make sure the new file is saved

---

## Install `uv`

##### (if you haven't already)

```bash
$ curl -LsSf https://astral.sh/uv/install.sh | sh
```

##### OR (if that doesn't work on Windows)

```bash
$ powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"
```

---

## Install `ipython`

##### (if you can)

```bash
$ uv pip install ipython 
```

### OR (if that doesn't work)

#### [Install UV]

---

## Fun!

```python
>>> import this
```

---

### Links

1. [slides.nlpia.org](https://nlpia.org)
2. [starter code](./wk4/wk4.py)
3. [sdccd-edu.zoom.us/my/dlane](https://sdccd-edu.zoom.us/my/dlane) - Mon 10AM & 7PM
4. [astral.sh/uv](https://docs.astral.sh/uv/getting-started/installation/)