Python
is one of a handful of modern programming languages gaining a lot of
traction in the development community. It was created by Guido von
Rossum in 1990, named after – you guessed it – the comedy, “Monty
Python’s Flying Circus”. Like Java, once written, programs can be run on
any operating system.
I
began programming many years ago, and admittedly once I got into
networking, turned away from my first love. But for those of you who
would like to begin trying your hand at a new language, Python is
excellent to start with. Supporters tout its low learning curve and
elegant coding system.
While this mode is good for initial learning, you may prefer to use a text editor (like Gedit, Vim or Emacs) to write your code. As long as you save it with the .py extension, it can be executed in the terminal window.
Ready to write your first program? Many a road to programming excellence began with the old standby – the Hello World program. So that’s where we’ll begin.
At the prompt, type in print “Hello World!” (with the quotes) and hit enter. You’ll see the command printed on the next line.
To run a script from the command line, type: python my_script.py. To exit the command line, type exit() or hit ctrl+d
To write a Python script, click on File > New Window. This will open a sort of Notepad type editor. Type in the following code:
Save the file, with a .py extension, then click on Run > Run Module from the menu to run the program.
I
began programming many years ago, and admittedly once I got into
networking, turned away from my first love. But for those of you who
would like to begin trying your hand at a new language, Python is
excellent to start with. Supporters tout its low learning curve and
elegant coding system.Python Installation
Ubuntu makes starting easy, as it comes with a command line version pre-installed. In fact, the Ubuntu community develops many of its scripts and tools under Python. You can begin the process with either the command line version or the graphical Interactive Development Environment (IDLE).Python Programming From the Command Line
Open a terminal window and type ‘python’ (without the quotes). This opens python in interactive mode.
While this mode is good for initial learning, you may prefer to use a text editor (like Gedit, Vim or Emacs) to write your code. As long as you save it with the .py extension, it can be executed in the terminal window.
Ready to write your first program? Many a road to programming excellence began with the old standby – the Hello World program. So that’s where we’ll begin.
At the prompt, type in print “Hello World!” (with the quotes) and hit enter. You’ll see the command printed on the next line.
To run a script from the command line, type: python my_script.py. To exit the command line, type exit() or hit ctrl+d
Python Programming with IDLE
Can’t imagine writing a long program from the command line? Me either. In that case, you can try IDLE. Open a terminal window and type: ‘idle’. (without the quotes). You’ll see the python graphical shell loaded.
To write a Python script, click on File > New Window. This will open a sort of Notepad type editor. Type in the following code:
#linuxversion.py
#Have user input version and print response
name = raw_input(“What Linux release do you use?”)
print “I also like”, name, ” – Linux rules!”
Couple things going on here. The first 2 lines, preceded by the #
sign are just comments. One of my earliest programming lessons was to
always comment your work, not only for your own sanity, but for those
who may need to edit the code after you. The third statement uses the
input gathered from the raw_input function and assigns it to a variable,
name. Finally, the print statement will return the result.Save the file, with a .py extension, then click on Run > Run Module from the menu to run the program.
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