適用するルールによって意見は二分 「8÷2（2＋2）＝」の答えは？
https://news.livedoor.com/article/detail/16867682/?fbclid=IwAR0X6-jUxNWLWaE6RouXezm5mAsOPxK-amkEsp1k5ocln0bSiixUy_WDVbc
適用する言語で、答えはいっぱい。python3では。
macOS
$ python3
Python 3.6.1 |Continuum Analytics, Inc.| (default, May 11 2017, 13:04:09)
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 8÷2(2＋2)
File "<stdin>", line 1
8÷2(2＋2)
^
SyntaxError: invalid character in identifier
>>>8 / 2 (2 + 2)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is not callable
>>> 8 / 2 * (2 + 2)
16.0
>>> 8/(2*(2+2))
1.0
>>> ctrl+D
python2では
macOS
$ python2.6
(unknown, Feb 7 2017, 00:08:08)
[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.34)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> 8÷2(2＋2)
File "<stdin>", line 1
8÷2(2＋2)
^
SyntaxError: invalid syntax
>>> 8 / 2 ( 2 + 2 )
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is not callable
>>> 8 / 2 * ( 2 + 2 )
16
>>> 8/(2*(2+2))
1
docker
/home/python3にファイルを置いています。
$ docker run -v /tmp/docker:/tmp/docker -it kaizenjapan/python23 /bin/bash
-v /tmp/docker:/tmep/dockerは、dockerを起動するシステムに/tmp/dockerというフォルダが利用可能な場合に記載。フォルダ名は、利用できるもので、docker側が空のものであればよい。
docker(89) dockerでpython2, python3
https://qiita.com/kaizen_nagoya/items/ecbe11a4d743357134d5
# python2.7
Python 2.7.17 (default, Nov 7 2019, 10:07:09)
[GCC 7.4.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> 8÷2(2＋2)
File "<stdin>", line 1
8÷2(2＋2)
^
SyntaxError: invalid syntax
>>> 8 / 2 ( 2 + 2 )
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is not callable
>>> 8 / 2 * ( 2 + 2 )
16
>>> 8/(2*(2+2))
1
# python3.8
Python 3.8.0 (default, Oct 28 2019, 16:14:01)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 8÷2(2＋2)
File "<stdin>", line 1
8÷2(2＋2)
^
SyntaxError: invalid character in identifier
>>> 8 / 2 (2 + 2)
<stdin>:1: SyntaxWarning: 'int' object is not callable; perhaps you missed a comma?
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is not callable
>>> 8 / 2 * (2 + 2)
16.0
>>> 8/(2*(2+2))
1.0
>>>
python2, python3で動くファイルにする。
eight.py
#! /usr/bin/env python3
# coding: utf-8
# docker(98) 8÷2(2＋2)をpythonで
print (8 / 2 * (2 + 2))
print (8/(2*(2+2)))
docker上で動作させる。
docker/ubuntu
# python2.7 eight.py
16
1
# python3.8 eight.py
16.0
1.0
#参考資料(reference)
プログラムちょい替え（11) Fortran 多次元配列のアクセス順序による計算時間の違い
https://qiita.com/kaizen_nagoya/items/3d657649d74fdd753bad
#まとめ(summary)
| Python 3.6.1/3.8.0 | Python 2.6.9/2.7.17 | |
|---|---|---|
| 8÷2(2＋2) | SyntaxError: invalid character in identifier | SyntaxError: invalid syntax |
| 8/2(2＋2) | TypeError: 'int' object is not callable | TypeError: 'int' object is not callable |
| 8/2*(2+2) | 16.0 | 16 |
| 8/(2*(2+2)) | 1.0 | 1 |
文書履歴(document history)
ver. 0.01 初稿 20190822
ver. 0.02 加筆 20181024
ver. 0.03 docker追記 20191231
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