Name: PY4E - 循環和迭代（第5章 第3部分 (PY4E - Loops and Iteration (Chapter 5 Part 3))
Uploaded: 2021-01-14T07:53:31.000Z
Duration: 8 min 44 s
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未來簡單式

- So now we're gonna
talk about Loop Idioms.

to 不定詞

We have the mechanics
of "fors" and "whiles",

but ultimately we want
to get something done.

whether it's lines or strings
or characters or numbers,

we're looking for something
like the largest or the smallest

or we want to add them up
or something like that.

The pattern that we're going to follow is

run once for each thing
in some chunk of data.

We're gonna set something at the beginning

and then we're going to
do something to each one.

And then at the end we're
gonna get the payoff.

And then this will be T
equals T plus the thing value.

a set of six numbers over
and over and over again.

We're going to do
something before the loop,

we're going to do
something after the loop,

and we're going to run the
loop some number of times.

In this case "thing" is
our iteration variable

because I'm using
unpneumonic variables now.

It's going to run and
print these things out.

It runs its loop six times and away we go.

Now this loop does nothing
except print stuff out.

to make sure that my brain is functioning.

I'm gonna ask you to
function as a program.

I'm gonna show you some
numbers in succession

given that I'm only
going to show them to you

Imagine I was going to show
you thousands of numbers.

How would you organize
yourself in a way so that

for an hour and a half you could sit here

as I showed you numbers
and you'd keep track

of the largest number that
you've seen of all the numbers?

and asked you, "What's
the largest number?"

(zooming of eyes moving around the screen)

You wouldn't do it in
any particular order.

and it would just throw
the smaller numbers away

and it would move really
quickly to what the answer is.

Even if there was several
hundred numbers on the screen

wherever it felt like moving
and then arrive at it.

it would do something like move like this,

find this, and then check
to make sure that it's okay.

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PY4E - 循環和迭代（第5章第3部分 (PY4E - Loops and Iteration (Chapter 5 Part 3))

stuff

ultimately

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figure

PY4E - 循環和迭代（第5章 第3部分 (PY4E - Loops and Iteration (Chapter 5 Part 3))

stuff

ultimately

sort

figure

PY4E - 循環和迭代（第5章第3部分 (PY4E - Loops and Iteration (Chapter 5 Part 3))