Creating Python scripts that can be run from the command line makes it much easier to abstract and share your code so that it can be reused and shared with others. Running scripts from the command line can also streamline your development and analysis workflows to make them more concise and make you more productive.
It’s quite easy to run Python scripts from the command line.
- Verify your terminal or command prompt can run Python
- Create a Python script that is error free
python your/file/name.pyto run your script from the terminal
This article will demonstrate how to get a simple Python script running on the command line in a matter of minutes. Once you’ve mastered that, you can get more complicated by passing in required arguments so that your scripts can stand on their own.
Make Sure Your Terminal or Command Prompt Can Run Python
To start, you need to make sure the command line application you are using has access to your Python installation. To do this, open the command prompt, type
python and press ‘Enter’. You should see a message that documents the Python version that is being used followed by
>>>, which indicates the next code you type will be executed by the Python interpreter. It will look something like this.
Python 3.8.8 (default, Apr 13 2021, 15:08:03) [MSC v.1916 64 bit (AMD64)] :: Anaconda, Inc. on win32 Type "help", "copyright", "credits" or "license" for more information. >>>
If you don’t see something similar, it means that you don’t have Python installed or that the command prompt is not aware of your Python installation.
Create a Python Script
Let’s create a very simple script to demonstrate how this works. This Python script (hello.py) will simply print out a statement that lets us know the code in the script has run, as shown below.
print("Hello from my Python script")
Run the Python Script from the Terminal
Once your Python script is created it’s super easy to run it from the terminal or command line. All you need to do is type
python followed by the script name. You’ll need to make sure that your terminal’s working directory is the directory that contains your python script, or give the full path to the script. For example. If I just type
python hello.py I get the following error.
python: can't open file 'hello.py': [Errno 2] No such file or directory
There are two ways to fix this.
First, specify the full file path. Like this.
C:\Users\Konrad>python c:/konrad/code/python/z_testing/hello.py Hello from my Python script
You can see that by specifying the full path to the python script that the terminal now knows where to find the file to run and I get the proper output.
cd to change the terminal’s current directory. Then run the script. Like this.
(base) C:\Users\Konrad>cd c:/konrad/code/python/z_testing (base) c:\konrad\code\python\z_testing>python hello.py Hello from my Python script
cd to change the terminal’s directory I no longer need to type the full path to the python script. This is especially useful if you have a number of different scripts in the same directory that you will want to run.
This article gives you a brief, simple introduction to running python scripts from the terminal (or command line). This is a powerful skill to have and there is so much more you can do with it. With a more advanced script, you can pass in parameters/arguments from the command line, which makes it easy to generalize and share your scripts for others to use in various situations. You can check out my guide for passing variables to python scripts from the terminal in this article.
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