Python in Jupyter: Difference between revisions
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=== Download a Jupyter Notebook === | === Download a Jupyter Notebook === | ||
Save the file at the following link and then open it. | Save the file at the following link and then open it. | ||
[https://communitydata.science/~groceryheist/CDSW_Jupyter_test_notebook%20.ipynb] | [https://communitydata.science/~groceryheist/CDSW_Jupyter_test_notebook%20.ipynb CDSW Jupter test notebook] | ||
===Download and start your text editor === | ===Download and start your text editor === |
Revision as of 23:36, 17 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.
- Terminal navigation instructions below should be updated to work for MacOS and Windows
- terminal navigation on Windows and terminal navigation on Mac instructions should be checked/updated, too.
Download a Jupyter Notebook
Save the file at the following link and then open it. CDSW Jupter test notebook
Download and start your text editor
- Launch Anaconda Navigator
- Find the "VSCode" application in the Anaconda Navigator "Home" window. If it is not yet installed, click "Install" (this may take a few minutes)
- Launch the VSCode text editor.
Write and save a short Python script
- Click "New file" to start a new, blank text file.
- 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.
- Start a new terminal prompt. See the terminal navigation on Windows or terminal navigation on Mac instructions for the steps to do this. Recall that on Windows 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 or terminal navigation on Mac 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!
Run the script
- 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.