How do I understand the code?

Question

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Python

ary = [1, 12, 13, 7, 9, 11]
x = 0
for i in ary:
     if x < i:
        x = i
print (x)

What I have tried:

Hi dears. I really have no idea how the following works.
Would anyone please elaborate it?
Thanks

Posted 29-Oct-20 22:53pm

Alen Alenn

Updated 30-Oct-20 1:48am

OriginalGriff

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OriginalGriff · Answer 1 · 2020-10-29T23:09:00

Think about how you find the biggest number in a list manually: you look at each of them and remember the "biggest number so far". This is the same thing!

So just work your way through it:
You create a collection that contains 6 numbers.
You set a "current maximum" that is lower than any of them can be.
You loop through each of the values, comparing it to the "current maximum".
If the "current maximum" is less than the value, you set the "current maximum" to the value. That way, the largest value so far is always in "current maximum"
After the loop, "current maximum" contains the largest of all the values you have looked at.

If you can't work that out for yourself, then you need to sit down and think about what you are doing - that is trivial code, and it's going to get a lot, lot harder in future ...

Patrice T · Answer 2 · 2020-10-30T01:49:00

Quote:
How do I understand the code?

Your code do not behave the way you expect, or you don't understand why !

There is an almost universal solution: Run your code on debugger step by step, inspect variables.
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't know what your code is supposed to do, it don't find bugs, it just help you to by showing you what is going on. When the code don't do what is expected, you are close to a bug.
To see what your code is doing: Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.

Debugger - Wikipedia, the free encyclopedia[^]

Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]
Basic Debugging with Visual Studio 2010 - YouTube[^]

27.3. pdb — The Python Debugger — Python 3.6.1 documentation[^]
Debugging in Python | Python Conquers The Universe[^]
pdb – Interactive Debugger - Python Module of the Week[^]

The debugger is here to only show you what your code is doing and your task is to compare with what it should do.

F-ES Sitecore · Answer 3 · 2020-10-30T01:39:00

Solution 2

Get a pen and paper, keep a note of the contents of each variable on the paper. Go through the code in your head line by line as it would execute, update the variable contents on paper as you go through it and that will give you a better idea about what the code is doing.

Posted 30-Oct-20 1:39am

F-ES Sitecore

How do I understand the code?

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