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:
Open a text editor (like
vim) and paste the "Hello World!" code:
Save the file with a
.pyextension, for example:
Make the script executable using the
chmod +x hello.py
2. Execute the Python Script:
Open a terminal.
Navigate to the directory where the script is located:
Run the script using the Python interpreter:
Alternatively, if the system has both Python 2 and Python 3 installed, specify
python3to use Python 3:
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:
bindirectory in your home directory if it doesn't exist:
hello.pyscript to the
mv hello.py ~/bin
~/bindirectory to your
PATHby adding the following line to your
Load the updated profile:
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.