#100DaysOfCode in Python Transcripts
Chapter: Days 34-36: Refactoring / Pythonic code
Lecture: Refactoring 4: use built-ins / standard library
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Right.
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Next up, use built in, learn the standard library.
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There's some very powerful built in functions
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you can use that save you a lot of code.
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For example, you run the range of numbers.
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Well instead of for e in, or do this classical for loop.
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I'm not even sure how to do it anymore.
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Now, in Python you can just numbers equals range
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1 11 and the first.
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The start is inclusive, and the end is exclusive.
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So just issue a numbers range of 1 through 11
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which doesn't say much but if I convert that
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into a list there you go, 1 to 10.
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And I didn't have to go through a for loop
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specifying end boundary, etc.
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So very nice.
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What about sum?
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Let's sum up those numbers.
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But in Python, you can just use sum,
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and look at that.
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It's easier, and less code, and saves you time.
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Let's look at max and min.
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So let's create some data.
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Again to stay at the gym,
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I have routines and I have timings.
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Let's make a dictionary.
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Workout times.
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Now see before I can use the zip with routines
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and timings and put that into the dict constructor
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to make a dictionary.
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So here are the workouts, and the times
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and minutes they should take.
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What I want to do next is to get the workout
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that takes most time and less time.
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Let's do it in the proposed way,
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if you wouldn't know about max.
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Yeah, legs was 55 minutes which was easily visible here.
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Now let's see the max building in action,
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and you will see that we can do this in one line of code.
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Workout times.
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items.
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Again items gets me a tuple, a list of tuples
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of key value, in this case routine and timing.
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Then I can use the key optional arguments
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to give it a or callable or lambda.
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In the lambda, I'm just saying what I want to sort 'em
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which is the value, the timing, the minutes.
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So this is basically telling max,
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that I want to get the maximum value based on the value
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which in this case is minutes.
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There you go.
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Boom.
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That returns a tuple of key value.
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Look at that.
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Compare one, two, three, four, five, six, seven,
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eight lines of code with one line of code
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accomplishing exactly the same thing.
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You can use min in the same way.
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It should get me the core workout of 30 minutes.
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I mean it takes the same inner logic,
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but as it is min it takes the min value.
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Look at that.
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Less code.
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Leveraging the built in functions from the standard library.
