Create a hello world application in Python.

Chris is a developer at Red Hat. He is teaching a basic programming class to a group of interns. He asks one of the interns to write a "Hello World!" application in Python. What is the intern going to write?

The intern is likely to write a simple "Hello World!" application in Python using the print() function. Here's the code they might write:

This code uses the print() function to display the text "Hello World!" on the console when the program is executed. It's a classic and common introductory example used to demonstrate the basic syntax of a programming language.

How would the intern convert the Python code into an executable file, and how would he or she execute it on a RHEL Linux system?

To convert the Python code into an executable file and execute it on a RHEL (Red Hat Enterprise Linux) system, the intern can follow these steps:

1. Convert Python Code into an Executable Script:

1. Open a text editor (like nano or vim) and paste the "Hello World!" code:

   print("Hello World!")

2. Save the file with a .py extension, for example: hello.py.

3. Make the script executable using the chmod command:

   chmod +x hello.py

2. Execute the Python Script:

1. Open a terminal.

2. Navigate to the directory where the script is located:

   cd /path/to/script/directory

3. Run the script using the Python interpreter:

   python ./hello.py

   Alternatively, if the system has both Python 2 and Python 3 installed, specify python3 to use Python 3:

   python3 ./hello.py

3. (Optional) Add the Script to a Directory in the PATH:

If you want to execute the script from anywhere without specifying its full path, you can place it in a directory that's included in the system's PATH environment variable. The ~/bin directory is a common choice for user-specific scripts:

1. Create the bin directory in your home directory if it doesn't exist:

   mkdir ~/bin

2. Move the hello.py script to the bin directory:

   mv hello.py ~/bin

3. Add the ~/bin directory to your PATH by adding the following line to your ~/.bashrc or ~/.bash_profile file:

   export PATH="$PATH:$HOME/bin"

4. Load the updated profile:

   source ~/.bashrc

Now you can simply use hello.py to execute the script from any directory.

Please note that the instructions provided here assume a basic setup on a RHEL Linux system. If the system has specific security policies or configurations, additional steps might be necessary.