How To Run Python Script Online Editor And Compiler Review

admin July 1, 2019

169 5 minutes read

How to Run Python Script in Linux Step By Step Guide

How To Run Python Script Online Editor And Compiler Review Python is a complicated field and you need to be skilled enough to go into this field Many people think that becoming a python developer is a piece of cake and you will have to have the skills to run python scripts and codes. Well, this step will ensure that the code is working as you planned it to work. So, if you are still a newbie, we have got amazing news for you as we have added How To Run Your Python Scripts & Codes in this article. We have added a step-by-step guideline to ensure that you get to run the scripts and codes regardless of the needs, skills, platform, and environment.

How To Run Python Script Online Editor And Compiler Review

Table of Contents

here we have shared a complete guide on how to run python script online with step by step guide.

How To Run Python Code Interactively

Running a python code through the interactive session is the most common way. Before starting off the interactive session, open a terminal or command line and enter “python” or you can even enter “python3” based on the installation and then, hit the enter button. We have added an example of doing it on Linux, have a look!

$ python3
Python 3.6.7 (default, Oct 22 2018, 11:32:17)
[GCC 8.2.0] on linux
Type “help”, “copyright”, “credits” or “license” for more information.
>>>

Once you see the >>> character, you will know that you are in as it is the standard prompt of the interactive mode. Now, you can run the python code just as you like. But when you close it, the code will be gone as well so, be sure. When you work through the interactive sessions, every statement and expression will be executed and evaluated immediately

>>>
>>> print(‘Hello World!’)
Hello World!
>>> 2 + 5
7
>>> print(‘Welcome to Real Python!’)
Welcome to Real Python!

The interactive code will make sure that you are able to test every code you have written which has become the reason for the naming of awesome development tool as well as an amazing tool to experiment with python and let the code fly. If you wish to quit the interactive mode, you can opt for the following option;

quit() or exit()
If you are using the Windows, you can press in the Ctrl+Z and “enter” combination
If you are a Unix-like system user, you can press in the Ctrl+D combination

How Interpreter Runs The Python Scripts?

When you are working on the python scripts, there will be various steps involved in the process of interpreter work, so, let’s see what those are!

It processes the script statement in a sequence
It compiles the source code to bytecode
It ships off the code for execution

This three-stepped model is commonly known as Python Execution Model

How To Run Python Scripts Using Command-Line

As we have already mentioned that through the interactive session, you might get what you were hoping for but the data and code will be deleted as soon as you hit the exit button. To get rid of such situation, usually, python programs are written in text files and then, the .py extension is used. If you are using the Windows computer, the extension can be .pyw as well.

You can opt for the sublime text if you are a beginner as it is powerful yet very easy to use. Now, you will have to make a test script. So, open the text editor and enter the following code;

1 #!/usr/bin/env python3
2
3 print(‘Hello World!’)

Now, save the file in the directory with “hello.py” and you can continue reading once the test script is ready.

Using The Python Command

Now, open the command –line and enter “python” or “python3” depending upon the installation version such as;

$ python3 hello.py
Hello World!

If you look at the screen after hitting the enter button and everything seems to be working out well, it means that you have successfully run the Python script. However, I things doesn’t work out fine, you can check the system path, python installation, location of file saving, and other things like that

Output Redirection

You can use the following code to save the script’s output for later analysis;

$ python3 hello.py > output.txt

It will redirect the script output to output.txt and the process has been named as stream redirection and can be used on Windows as well as Unix-like systems. Now, if you want to add the output of executions, you have to use two >> brackets like in the section below;

$ python3 hello.py >> output.txt

The output will be added to the end of output.txt.

Running Modules

Python has a great range of command-line options which can be chosen as per the needs. It will search the sys.path of the module and runs it such as;

$ python3 -m hello
Hello World!

Using Script Filename

You can run Python scripts by entering the file name that has code added to it at the command prompt such as;

C:\devspace> hello.py
Hello World!

You can do it by taking this as an example as well;

$ # Assign execution permissions
$ chmod +x hello.py
$ # Run the script by using its filename
$ ./hello.py
Hello World!

Once the execution and shebang line has been configured, you can run the python script by typing the filename in the command line

How To Run Python Script Interactively

You can run the modules as well as the python scripts with the help of interactive sessions as it has a wide range of possibilities;

Import

You get to load the contents of the module once you import it for the later use and access. This will run the code as it does in the final step! It also provides another option for running the python script such as;

>>> import hello
Hello World!

This will work per session and after the first import, executions will bear no fruit even

>>>
>>> import hello # Do nothing
>>> import hello # Do nothing again
To make sure that PMSP runs just fine, you need to run the following code in python;
>>>
>>> import sys
>>> for path in sys.path:
… print(path)
…
/usr/lib/python36.zip
/usr/lib/python3.6
/usr/lib/python3.6/lib-dynload
/usr/local/lib/python3.6/dist-packages
/usr/lib/python3/dist-packages

You will get a long list of zip files along with the directories where python has imported the modules

Use imp & importlib

You will easily find the importlib in the standard library which is responsible for providing the import_module (). You can also emulate the import operation and execute the script as well by taking this as an example;

>>>
>>> import importlib
>>> importlib.import_module(‘hello’)
Hello World!
<module ‘hello’ from ‘/home/username/hello.py’>

Once you have imported this module, you will have to use the reload option to gain access to it again and to run it. You can use it like;

>>>
>>> import hello # First import
Hello World!
>>> import hello # Second import, which does nothing
>>> import importlib
>>> importlib.reload(hello)
Hello World!
<module ‘hello’ from ‘/home/username/hello.py’>

Then, add the following module;

>>>
>>> importlib.reload(‘hello’)
Traceback (most recent call last):
…
TypeError: reload() argument must be a module

If you are using the python2.x, you will have access to imp. which will provide the reload function such as;

>>>
>>> import hello # First import
Hello World!
>>> import hello # Second import, which does nothing
>>> import imp
>>> imp.reload(hello)
Hello World!
<module ‘hello’ from ‘/home/username/hello.py’>
Runpy.run_module() & runpy.run_path()

The standard module library is known as runpy and you can easily find the run_module() in this module. This will allow the users to run modules without having to import them. You can do it like;

>>>
>>> runpy.run_module(mod_name=’hello’)
Hello World!
{‘__name__’: ‘hello’,
…
‘_’: None}}

It also provides a run_path() which allows the users to run the module by location such as;

>>>
>>> import runpy
>>> runpy.run_path(file_path=’hello.py’)
Hello World!
{‘__name__’: ‘<run_path>’,
…
‘_’: None}}

Hacking exec()

You can now use the exec() to run the python script and it has been named as the best alternative way of running the script.

>>>
>>> exec(open(‘hello.py’).read())
‘Hello World!’

It runs the code by opening the hello.py and reading the content. It is just a little hack to show how versatile Python can be!

This was all about How To Run Your Python Scripts & Codes and we hope that it worked out great for you. If you have any more questions, you can reach out to us in the comment section below and we will be here to help. If you like the information, share it with your friends and family who are into coding and languages. Thank you!