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Python software
1. Python software
2. Python
Python is a general purpose programming language.
Python is powerful... and fast; plays well with others; runs everywhere; is friendly & easy to learn; is Open. From the Python web site at
https://www.python.org/ .
3. CentOS installation
The CentOS repository has the older Python 2.7.5. The newer version is 3.x.
Since yum may break if we are not careful, we will use Python 2.7.5 for now.
4. Verify the version
The following Linux command(s) check the installed version of Python.
python --version
On
2019-08-04 the output was as follows.
Python 2.7.5
5. Interactive mode
The following Linux command(s) enter interactive mode.
python
Then type the following commands interactively, pressing
Enter after each command. Press
Ctrl-D to exit interactive mode.
4+3
The output should be as follows.
7
6. Hello world in Python
The file type of a
Python program file is
py.
The following Linux command(s) create/edit a hello program in the your home directory using the nano text editor.
nano ~/hello.py
Create the following program text in the editor that will output the text "Hello world"
print("Hello world")
To exit with save, remember to press
Ctrl-X, then "
y" (for yes) and
Enter to exit.
The following Linux command(s) run the program.
python ~/hello.py
The output should be as follows.
Hello world
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