Python - Functions and Generators(Keywords)

Learning Python
(Oreilly & Associates Inc)
Mark Lutz (著)
(邦訳版)

開発環境

• OS X Mavericks - Apple(OS)
• Emacs (CUI)、BBEdit - Bare Bones Software, Inc. (GUI) (Text Editor)
• Python (プログラミング言語)

Learning Python (Mark Lutz (著)、Oreilly & Associates Inc)のPART III.(Functions and Generators)、Test Your Knowledge: Part IV Exercises 、4.(Keywords)を解いてみる。

その他参考書籍

• Pythonチュートリアル 第2版
• Python クックブック 第2版 (原書(最新版))

4.(Keywords)

コード(BBEdit)

sample.py

#!/usr/bin/env python3
#-*- coding: utf-8 -*-

def adder(good=1, bad=2, ugly=3):
    return good + bad + ugly

for args in [(10, ), (10, 20), (10, 20, 30), (10, 20, 30, 40),
             ([1],), ([1], [2]), ([1], [2], [3]), ([1], [2], [3], [4])]:
    try:
        print(adder(*args))
    except Exception as err:
        print(type(err), err, err.args)

print(adder(ugly=1, good=2))   # 5

def adder1(**args):
    vs = list(args.values())
    result = vs[0]
    for v in vs[1:]:
        result += v
    return result

for args in [(1, 2), ([1], [2])]:
    try:
        print(adder1(*args))
    except Exception as err:
        print(type(err), err, err.args)

for args in [{'a':1, 'b':2}, {'a':[1], 'b':[2]}]:
    try:
        print(adder1(**args))
    except Exception as err:
        print(type(err), err, err.args)

入出力結果(Terminal)

$ ./sample.py
15
33
60
<class 'TypeError'> adder() takes from 0 to 3 positional arguments but 4 were given ('adder() takes from 0 to 3 positional arguments but 4 were given',)
<class 'TypeError'> can only concatenate list (not "int") to list ('can only concatenate list (not "int") to list',)
<class 'TypeError'> can only concatenate list (not "int") to list ('can only concatenate list (not "int") to list',)
[1, 2, 3]
<class 'TypeError'> adder() takes from 0 to 3 positional arguments but 4 were given ('adder() takes from 0 to 3 positional arguments but 4 were given',)
5
<class 'TypeError'> adder1() takes 0 positional arguments but 2 were given ('adder1() takes 0 positional arguments but 2 were given',)
<class 'TypeError'> adder1() takes 0 positional arguments but 2 were given ('adder1() takes 0 positional arguments but 2 were given',)
3
[1, 2]
$