Anonymous user
Montreal Python Workshop/Friday/Linux Python scripts: Difference between revisions
Montreal Python Workshop/Friday/Linux Python scripts (view source)
Revision as of 02:54, 20 February 2013
, 11 years agono edit summary
imported>Gward (Created page with "{{:Boston_Python_Workshop_7/Friday/Linux_Python_scripts}}") |
imported>Merwok No edit summary |
||
Line 1:
We are going to practice writing and running Python scripts.
===Start your text editor===
# Launch your text editor. See the [[Montreal Python Workshop/Friday/Linux text editor|Linux text editor setup]] instructions for the steps to do this.
# Start a new, blank text file.
===Write and save a short Python script===
# Type the following line in your new text file:
<pre>
print "Hello World!"
</pre>
# Save the script as <code>hello.py</code> in your home directory. The <code>.py</code> extension indicates that this file contains Python code.
===Run the script===
# Start a command prompt. See the [[Montreal Python Workshop/Friday/Linux terminal navigation|terminal navigation on Linux]] instructions for the steps to do this. Recall that a terminal prompt will look like <code>jesstess$</code> and a Python prompt will look like <code>>>></code>. Make sure you are at a terminal prompt and not a Python prompt; if you are at a Python prompt, you can type <code>exit()</code> on a line by itself and then hit enter to exit Python and return to a terminal prompt.
# Navigate to your home directory from a command prompt, using the <code>ls</code>, <code>pwd</code>, and <code>cd</code> commands. See the [[Boston Python Workshop 7/Friday/Linux terminal navigation|terminal navigation on Linux]] instructions for a refresher on using these commands. Don't hesitate to get help from a staff member on this step if you need it -- it's a new way of navigating your computer, so it may be unintuitive at first!
# Once you are in your home directory, you'll see <code>hello.py</code> in the output of <code>ls</code>.
# Type
<pre>
python hello.py
</pre>
and hit 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
<pre>
print "Hello World!"
</pre>
at a Python prompt and hit enter.
===Success===
You created and ran your first Python script!
* When you run the <code>python</code> command by itself, you start a Python prompt. You can execute Python code interactively at that prompt.
* When you run the <code>python</code> command with a file name as an argument, Python executes the Python code in that file.
[[Montreal Python Workshop/Friday|« Back to the Friday setup page]]
| |||