August 2022
Intermediate to advanced
200 pages
5h 16m
Japanese
Content preview from Python1年生 第2版 体験してわかる！会話でまなべる！プログラミングのしくみ
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter
3
104
消費税（
10%
）を 計算してくれるプログラムを 書こう
それでは「商品の本体価格を渡すと、消費税計算を行い、消費税込みの金額がわかる関
数」を作ってみましょう。これは「④引数も戻り値もある関数」を使います。
この関数に、商品の価格（
price）を引数として渡すと、関数の中で10%の消費税計算を
行います。そして税込み金額を戻り値として返します。
関数を作るときは、「
def 関数名 (引数) :」と指定します。関数名をpostTaxPriceとするな
ら「
def postTaxPrice(price) :」と指定します。作った関数は「postTaxPrice (本体価格) 」で
呼び出して実行します。
def postTaxPrice(price):
ans = price * 1.1
return ans
print(postTaxPrice(120),"
円")
print(postTaxPrice(128),"
円")
print(postTaxPrice(980),"
円")
132.0 円
140.8 円
1078.0 円
ここで作ったのは「本体価格を渡すと、消費税込みの金
額を返してくれる関数」だよ。
「仕事を関数にまとめて書く」ってことは、何回も呼び出して使えるので
楽できる、っていうこともあるけど、「プログラムの意味がわかりやす
くなる」っていうことも大きいよ。「意味がわかりやすい」ってことは、
それだけバグ（プログラムのエラー）が少なくなるってことだからね。
消費税計算のためにわざわざ ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.