In this post, we will examine two great features we can begin using in our amazing Python applications. The first is the ability to use the pound sign (#) in order to add comments to our code.
This, of course, makes our code more “self-documenting”. This is a fancy term for us being able to figure out what the hell the code is supposed to do if we wrote it a long time ago and forgot! It is also nice to have this done in the event we ship our code off to a peer that needs to understand what we are up to.
# This is an entire line of code that is not going to run in this application. # It is just here for our documentation purposes. print "Here is the print command at work that we used in an earlier lesson." print "And here is another cool way to use it!" # This will not print even though it is in the same line of code!
Let me save this masterpiece as ex2.ps and run it! Today I am using the Python download for Windows because I cannot find my MacBook! 🙂
C:\Users\terry> python C:\Users\terry\OneDrive\Blog\Python\ex2.ps Here is the print command at work that we used in an earlier lesson. And here is another cool way to use it! C:\Users\terry>
Now let’s turn our attention to math – here are the math operators we have at our disposal!
Now it is time for me to create ex3.ps and have some fun with math!
print "How much I tip in USA for poor service on $100 = $", 100 * .15 print "If the service is good on $100 = $", 100 * .18 print "If the service is awesome on $100 = $", 100 * .20 print "My age is shown below!" print 40 + 9
Now it is time to run it!
C:\Users\terry>python C:\Users\terry\OneDrive\Blog\Python\ex3.ps How much I tip in USA for poor service on $100 = $ 15.0 If the service is good on $100 = $ 18.0 If the service is awesome on $100 = $ 20.0 My age is shown below! 49
I hope you will return for some more Python fun soon!
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8 thoughts on “Learning Python – Lesson 2: Comments and Math!”
Is there any short cut I could easily learn python?
Please help me!
I am going through the text – Learning Python the Hard Way – Third Edition. It is excellent and straight to the point. Check it out!
the easily way to learn python thanks alot
It is my pleasure!
I am trying to do ex2 and it is not working for me because when i’m putting the % symbol it tells me “SyntaxError: invalid syntax”
I am so sorry about that – I took the % out of this discussion because it actually has two uses in Python and I will need to do a separate post on that subject!
I wrote updated code for you to play with in this post!
Enjoy and keep up the great work!
Thank’s man, you are the best!
My pleasure! I just this second updated Lesson 4. So if you have gotten that far, refresh the page and enjoy the last code example. If you have not gotten to Lesson 4 yet – no worries!