Pythonで入力値の演算を表示

index.html , python.cgi を作成

index.html

<!DOCTYPE html>
<html>
<head><meta charset="utf-8" /></head>
<h1>入力値の演算を表示</h1>
    <form action="python.cgi" method="POST">
		値１を入力：
		<input type="number" name="a"><BR><BR>
		記号を入力：
		<INPUT type="radio" name="b" value="+"> ＋ 
		<INPUT type="radio" name="b" value="-"> － 
		<INPUT type="radio" name="b" value="x"> ｘ 
		<INPUT type="radio" name="b" value="/"> ÷ <BR><BR>
		値２を入力：
		<input type="number" name="c"><BR>
		　<BR>
        <input type="submit" name="submit" value="　＝　">
    </form>
</body>
</html>

python.cgi

#!/opt/alt/python37/bin/python3
import sys
import io

sys.stdin = io.TextIOWrapper(sys.stdin.buffer, encoding='utf-8')
sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8')
sys.stderr = io.TextIOWrapper(sys.stderr.buffer, encoding='utf-8')

import cgi
import cgitb
import math
import json

cgitb.enable()

form = cgi.FieldStorage() #クエリ文字列の値を取得
if "a" not in form or "b" not in form or "c" not in form:
	a=0
	b="e"
	c=0
else:
	a = int(form['a'].value)
	b = form['b'].value
	c = int(form['c'].value)

if    b == "+" :
		d = str(a + c)
		
elif  b == "-" :
		d = str(a - c)
		
elif  b == "x" :
		d = str(a * c)
		
elif  b == "/" and c != 0:
		d = str(a / c)
		
else: 
		d = "解なし"



print("Content-type: text/html; charset=utf-8\n")
htmlText = '''
<!DOCTYPE html>
<html>
    <head><meta charset="shift-jis" /></head>
    <p>入力値の計算は&nbsp; %s<br/></p>
    <hr/>
    <a href="index.html">戻る</a>　
</body>
</html>
'''

print(htmlText % d)

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