Python Fundamentals

Python Fundamentals Debugging Strategies in Python

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Nina demonstrates how to debug a python file using print statements.

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Transcript from the "Debugging Strategies in Python" Lesson

>> Nina Zakharenko: Generally, you'll want to debug your code with print statements when you're first starting out. So just an example of that, I'm gonna make a new file and I'm gonna call it And I'm gonna make a function called mystery.
>> Nina Zakharenko: And I'm gonna say that my number is equal to this.

[00:00:29] And if my number is equal to 10, let's set it to the number times 10.
>> Nina Zakharenko: Otherwise, if the number, and I can use an l, also, here as well. Otherwise, if the number is equal to 30, we're gonna set the number to the number times 30.
>> Nina Zakharenko: And we're gonna return that number, let me hide the terminal for a second.

[00:01:07] And then at the bottom of the file we're gonna call this mystery().
>> Nina Zakharenko: And notice that calling the function is not indented under the function definition. So calling that real quickly. Oops, I wanted to print the result of calling mystery. We'll see that the number was 900 and it's like well I'm not really sure what happened here right?

[00:01:34] So we can put some print statements here.
>> Nina Zakharenko: And that will help us figure out which path we went down, right? You can say num was here.
>> Nina Zakharenko: And I'll add these particular files to the Git repo so that you can look at them. Now if I run this code again, well I know which condition was met.

[00:02:05] I know what the number was set to, right. Generally, as you advance in Python, you're gonna want to use a debugger. But for the time being, print statements are a great tool. But you just have to remember not to litter your production code with them, right?