Load and run python script

How to Run a Python Script

Python is a well known high-level programming language. The Python script is basically a file containing code written in Python. The file containing python script has the extension ‘ .py ’ or can also have the extension ‘ .pyw ’ if it is being run on a windows machine. To run a python script, we need a python interpreter that needs to be downloaded and installed.

Here is a simple python script to print ‘ Hello World! ’:

Here, the ‘ print() ’ function is to print out any text written within the parenthesis. We can write the text that we want to be printed using either a single quote as shown in the above script or a double quote.

If you are coming from any other language then you will also notice that there is no semicolon at the end of the statement as with Python, you no need to specify the end of the line. And also we don’t need to include or import any files to run a simple python script.

There is more than one way to run a python script but before going toward the different ways to run a python script, we first have to check whether a python interpreter is installed on the system or not. So in windows, open ‘cmd’ (Command Prompt) and type the following command.

This command will give the version number of the Python interpreter installed or will display an error if otherwise.

Different ways to run Python Script

Here are the ways with which we can run a Python script.

1. Interactive Mode
2. Command Line
3. Text Editor (VS Code)
4. IDE (PyCharm)

1. Interactive Mode:
   In Interactive Mode, you can run your script line by line in a sequence. To enter in an interactive mode, you will have to open Command Prompt on your windows machine and type ‘ python ’ and press Enter . Example 1:
   Run the following line in the interactive mode:

   

   Output:

   

   Output: Example 3:
   Run the following line one by one in the interactive mode:

   

   Output:Note: To exit from this mode, press ‘ Ctrl+Z ’ and then press ‘Enter’ or type ‘ exit() ’ and then press Enter .
   Command Line
   To run a Python script store in a ‘ .py ’ file in command line, we have to write ‘ python ’ keyword before the file name in the command prompt.

   

   You can write your own file name in place of ‘hello.py’. Output:

2. Text Editor (VS Code)
   To run Python script on a text editor like VS Code (Visual Studio Code) then you will have to do the following:
   • Go in the extension section or press ‘ Ctrl+Shift+X ’ on windows, then search and install the extension named ‘ Python ’ and ‘ Code Runner ’. Restart your vs code after that.
   • Now, create a new file with the name ‘hello.py’ and write the below code in it:

   Output:
   

3. IDE (PyCharm)
   To run Python script on a IDE (Integrated Development Environment) like PyCharm, you will have to do the following:
   • Create a new project.
   • Give a name to that project as ‘GfG’ and click on Create.
   • Select the root directory with the project name we specified in the last step. Right click on it, go in New and click on ‘Python file’ option. Then give the name of the file as ‘hello’ (you can specify any name as per your project requirement). This will create a ‘hello.py’ file in the project root directory.
     Note: You don’t have to specify the extension as it will take it automatically.
   • Now write the below Python script to print the message:

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   How to Run a Python Script in Windows

   When it comes to operating systems, there are three main ones for personal computers: Microsoft Windows, Apple’s macOS, and Linux. You can use any of these operating systems to develop and run your Python programs. However, there are subtle differences you need to keep in mind while developing your projects. In this article, we’ll outline how to run a Python script in Windows.

   In general, we recommend you work with Python 3, which is the latest version. If you need some help getting Python installed, check out our article How to Install Python on Windows. To make sure you’re up to speed with the terminology we use in this article, take a look at Python Terms Beginners Should Know – Part 1.

   If you’re new to programming, a good place to start is our Python Basics track, which contains three useful courses to teach you the fundamentals. We have more course suggestions in the article How to Learn Python Online for Free.

   Your First Python Script

   To follow along with this article, you’ll need to create your own Python script. This script doesn’t have to be fancy – a ‘Hello, World!’ program will do. Simply open a text editor (such as Notepad) and type:

   Just make sure there aren’t any spaces before the print() statement. Then save it as ‘script.py’.

   Run Python Code from the Command Prompt

   The first way to work with Python in Windows is through an interactive session. To get an interactive session started, just open the Command Prompt. Search for cmd on the toolbar, then hit Enter. Once the command prompt is open, simply type python and hit Enter again.

   When you’re in an interactive session, every Python statement is executed immediately and any output is displayed directly beneath. Try typing:

   >>> print('Hello, World!') Hello, World!

   From here, you can write any Python code you want. To exit the interactive session, type quit() or exit() .

   To run the script that we created above, you can call the Python program from the Command Prompt and tell it which file to execute. From the Command Prompt, simply type:

   You’ll see the Hello, World! output printed directly to the screen. For more details on this method, check out How to Open and Run Python Files in the Terminal.

   This is the most basic method of executing scripts that you should be familiar with. You could develop your whole project in Notepad and run the script in this way. This is totally legit, but for many applications it’s not the easiest method.

   Run Python Code from an IDE

   A much more useful way to develop and run your Python projects is using an Integrated Development Environment (IDE). For some background reading, check out our article 4 Best Python IDE and Code Editors. My personal recommendation is to use Spyder (which has a nice mix of features and is user-friendly) but any IDE will do. You can download Spyder here.

   Once you’ve downloaded and installed it, open Spyder to get started. Since you already have your script written, you just need to open it in the editor. To run the script, simply click the play button in the top toolbar. You should see the output displayed in the interactive console.

   Using an IDE to develop and run your Python projects is the most convenient way to work.

   Run a Python Script from the File Manager

   The final way of running your Python script that we’ll discuss is double-clicking the .py file. This is possibly the least useful option, but it could be convenient once you have fully developed and tested your project. It could also require a little bit of configuration.

   You need to ensure your .py file is associated with python.exe. Right click the .py file, select Open with > Python. Now try double-clicking the .py file. You’ll see the Command Prompt flash briefly, then close again. To avoid this, you can add the following line to the end of your script:

   input('Press Enter to Continue')

   Now the script will stop when you hit the Enter key.

   Running Python Scripts in Windows: Next Steps

   In this article, we discussed three ways to run your Python scripts in Windows. This is something you’ll need to do often to develop and test your programs.

   Learning anything new can be challenging. For some tips on the best ways to learn Python, check out our article 5 Tips for Learning Python from Scratch. With a little bit of consistent effort, you’ll become a Python master in no time!

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