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  • Now that you know what therangefunction does, let’s see it in a for- loop.

  • To print all the values from 2 to the power of 0, 2 to the power of 1, and so on, until

  • 2 to the power of 9, we can use the following code: for “n” in range of 10, print “2

  • double star n”.

  • I will also have to insert a comma, because I would like to see the output on a single

  • line.

  • Good.

  • I guess you can agree it was not necessary to specify the name of a list that exists

  • in our codeusing a list created through therangefunction is going to work

  • too!

  • Now, let’s be brave and create an iteration that includes a conditional in the loop body.

  • We can tell the computer to print all the even values between 0 and 19 and stateOdd

  • in the places where we have odd numbers.

  • Let’s translate this into computational steps.

  • If x leaves a remainder of 0 when divided by 2, which is the same as to sayif x

  • is even”, then print x on the same line.

  • Else”, which means unless x is even, or if x is odd, printOdd”.

  • Lovely!

  • This is an example of a combination of an iteration and a conditional in Python.

  • There are two main ways to program a loop, and until this moment, we paid attention only

  • to the first one.

  • We have a list x that contains the numbers 0, 1, and 2.

  • We saw we can print out each of its elements by typingfor each item in the x list,

  • print out that item”.

  • The second way finds its practical application in more sophisticated codes.

  • Its structure takes advantage of the range and len functions in the following way: “for

  • each item in a range that goes through the elements from the list x, that islen with

  • an argument x”, print out each item”.

  • If we do this, the variable item will loop through a new list created by range, and that

  • has as many elements as the x list itself.

  • Please note that, in this situation, the second line of our code needs indexing to extract

  • each item from the “x” list.

  • In practice, we will print out the element at position 0 from the list x, then the element

  • at position 1, and finally the element at position 2.

  • To conclude, both approaches can lead to the same outcome.

  • Although the second one looks unnecessarily complicated, in advanced coding, it might

  • turn out to be a lot more useful.

  • So, it is important you know both.

  • Don’t skip the exercises that come with this lecture, as they will reinforce what

  • youve learned here!

  • Thank you for watching!

Now that you know what therangefunction does, let’s see it in a for- loop.


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A2 初級

条件文とループ (Conditional Statements and Loops)

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    林宜悉 に公開 2021 年 01 月 14 日