Terminal User Guide

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You can use the command-line environment interactively by typing a command and waiting for a result, or you can use the shell to compose scripts that run without direct interaction.

Execute commands in the shell

In the Terminal app on your Mac, enter the complete pathname of the tool’s executable file, followed by any needed arguments, then press Return.

If a command is located in one of the shell’s known folders, you can omit path information when entering the command name. The list of known folders is stored in the shell’s PATH environment variable and includes the folders containing most command-line tools.

For example, to run the ls command in the current user’s home folder, enter the following at the command prompt, then press Return:

To run a command in the current user’s home folder, precede it with the folder specifier. For example, to run MyCommandLineProg, use the following:

% ~/MyCommandLineProg

To open an app, use the open command:

When entering commands, if you get the message command not found, check your spelling. Here’s an example:

% opne -a TextEdit.app zsh: opne: command not found

Terminate commands

In the Terminal app on your Mac, click the Terminal window that is running the command you want to terminate.
Press Control-C.
This sends a signal that causes most commands to terminate.

Repeat previously entered commands

The commands you enter during a session are saved so you can repeat a previously used command without retyping it.

In the Terminal app on your Mac, press the Up Arrow key.
The last command you entered appears on the command line.
Continue pressing the Up Arrow key until you see the command you want, then press Return.

See alsoSpecify files and folders in Terminal on MacRedirect Terminal input and output on MacDrag files into a Terminal window to specify paths on MacKeyboard shortcuts in Terminal on MacApple Developer website: Command Line Primer

Your Python code can be up on a code editor, IDE or a file. And, it won’t work unless you know how to execute your Python script.

In this blog post, we will take a look at 7 ways to execute Python code and scripts. No matter what your operating system is, your Python environment or the location of your code – we will show you how to execute that piece of code!

Table of Contents

Running Python Code Interactively
How are Python Script is Executed
How to Run Python Scripts
How to Run Python Scripts using Command Line
How to Run Python Code Interactively
Running Python Code from a Text Editor
Running Python Code from an IDE
How to Run Python Scripts from a File Manager
How to Run Python Scripts from Another Python Script

Where to run Python scripts and how?

You can run a Python script from:

OS Command line (also known as shell or Terminal)
Run Python scripts with a specific Python Version on Anaconda
Using a Crontab
Run a Python script using another Python script
Using FileManager
Using Python Interactive Mode
Using IDE or Code Editor

Running Python Code Interactively

To start an interactive session for Python code, simply open your Terminal or Command line and type in Python(or Python 3 depending on your Python version). And, as soon as you hit enter, you’ll be in the interactive mode.

Here’s how you enter interactive mode in Windows, Linux and MacOS.

Interactive Python Scripting Mode On Linux

Open up your Terminal.

It should look something like

Enter the Python script interactive mode after pressing “Enter”.

Interactive Python Scripting Mode On Mac OSX

Launching interactive Python script mode on Mac OS is pretty similar to Linux. The image below shows the interactive mode on Mac OS.

Interactive Python Scripting Mode On Windows

On Windows, go to your Command Prompt and write “python”. Once you hit enter you should see something like this:

Running Python Scripts Interactively

With interactive Python script mode, you can write code snippets and execute them to see if they give desired output or whether they fail.

Take an example of the for loop below.

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Our code snippet was written to print everything including 0 and upto 5. So, what you see after print(i) is the output here.

To exit interactive Python script mode, write the following:

And, hit Enter. You should be back to the command line screen that you started with initially.

There are other ways to exit the interactive Python script mode too. With Linux you can simply to Ctrl + D and on Windows you need to press Ctrl + Z + Enter to exit.

Note that when you exit interactive mode, your Python scripts won’t be saved to a local file.

How are Python scripts executed?

A nice way to visualize what happens when you execute a Python script is by using the diagram below. The block represents a Python script (or function) we wrote, and each block within it, represents a line of code.

When you run this Python script, Python interpreter goes from top to bottom executing each line.

And, that’s how Python interpreter executes a Python script.

But that’s not it! There’s a lot more that happens.

Flow Chart of How Python Interpreter Runs Codes

Step 1: Your script or .py file is compiled and a binary format is generated. This new format is in either .pyc or .pyo.

Step 2: The binary file generated, is now read by the interpreter to execute instructions.

Think of them as a bunch of instructions that leads to the final outcome.

There are some benefits of inspecting bytecode. And, if you aim to turn yourself into a pro level Pythonista, you may want to learn and understand bytecode to write highly optimized Python scripts.

You can also use it to understand and guide your Python script’s design decisions. You can look at certain factors and understand why some functions/data structures are faster than others.

How to run Python scripts?

To run a Python script using command line, you need to first save your code as a local file.

Let’s take the case of our local Python file again. If you were to save it to a local .py file named python_script.py.

There are many ways to do that:

Create a Python script from command line and save it
Create a Python script using a text editor or IDE and save it

Saving a Python script from a code editor is pretty easy. Basically as simple as saving a text file.

But, to do it via Command line, there are a couple of steps involved.

First, head to your command line, and change your working directory to where you wish to save the Python script.

Once you are in the right directory, execute the following command in Terminal:

Once you hit enter, you’ll get into a command line

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