Python in Jupyter: Difference between revisions
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Revision as of 01:40, 15 January 2020
We are going to practice writing and running Python programs (often called "scripts").
TODO:
- Download a sample notebook
- Make sure the notebook is in your desktop (this keeps things simple)
- Open the notebook in jupyter tab in browser.
- Notebook itself should encourage them to run some cells.
Start your text editor
- Launch the Visual Studio Code text editor.
- Start a new, blank text file.
Write and save a short Python script
- Add the following line to your new text file:
print("Hello World!")
- Save the script as
hello.py
in your Desktop directory. The.py
extension indicates that this file contains Python code.
Run the script
- Start a new terminal prompt. See the terminal navigation on Windows instructions for the steps to do this. Recall that a terminal prompt will look like
C:\
and a Python prompt will look like>>>
. Make sure you are at a terminal prompt and not a Python prompt; if you are at a Python prompt, you can typeexit()
on a line by itself and then press enter to exit Python and return to a terminal prompt. - Navigate to your Desktop directory from a PowerShell terminal prompt, using the
ls
andcd
commands. See the terminal navigation on Windows instructions for a refresher on using these commands. Don't hesitate to get help from a mentor on this step if you need it -- it's a new way of navigating around your computer, so it may be unintuitive at first! - Once you are in your Desktop directory, you'll see
hello.py
in the output ofls
. - Type
python hello.py
and press enter. Doing this will cause Python to execute the contents of that script -- it should print "Hello World!" to the screen. What you've done here is run the Python application with an argument -- the name of a file, in this case "hello.py". Python knows that when you give it a file name as an argument, it should execute the contents of the provided file. You get the same result as if you typed
print("Hello World!")
at a Python prompt and press enter.
Success
You created and ran your first Python script!
- When you run the
python
command by itself, you start a Python prompt. You can execute Python code interactively at that prompt. - When you run the
python
command with a file name as an argument, Python executes the Python code in that file.