python OOP if文に迷惑メールと変数が定義されていない

Question

私のプログラムでは、最初のmainとしてif文が書かれていますが、文字が入力されるたびにそれを数回入力する必要があり、変数num3とden3。

class menu: 
    def question(): 
     prnt = print("Which equation would like to do? \n A: Inverse the fracion \n B: Add 2 fractions \n C: Subtract 2 fractions \n D: Multiply 2 fractions \n E: Divide 2 fractions \n F: Square a fraction \n") 

    def ask(): 
     ask = input("") 
     return ask 

class fractions: 
    def numerator(): 
     ask = menu.ask() 
     if ask == "b" or menu.ask() == "B" or ask == "C" or ask == "c" or ask == "D" or ask == "d" or menu.ask() == "e" or menu.ask() == "e": 
      num1 = int(input("What is the first numerator? \n")) 
      num2 = int(input("What is the second numerator? \n")) 
      return num1 
      return num2 

     elif ask == "a" or ask == "A" or ask == "f" or ask == "F": 
      num1 = int(input("What is the numerator? \n")) 
      return num1 

    def denominator(): 
     ask = menu.ask() 
     if mask == "b" or ask == "B" or ask == "C" or ask == "c" or ask == "D" or menu.ask() == "d" or menu.ask() == "e" or menu.ask() == "e": 
      den1 = int(input("What is the first denominator? \n")) 
      den2 = int(input("What is the second denominator? \n")) 
      return den1 
      return den2 

     elif ask == "a" or ask == "A" or ask == "f" or ask == "F": 
      den1 = int(input("What is the denominator? \n")) 
      return den1 

class math(): 
    def math1(a,b): 
      num3 = den1 
      den3 = num1 
      return num3 
      return den3 

    def math2(a,b): 
     if den1 == den2: 
      num3 = num1 + num2 
      den3 = den1 
      return num3 
      return den3 

     if den1 != den2: 
      num1 = num1 * den2 
      num2 = num2 * den1 
      den3 = den1 * den2 
      num3 = num1 + num2 
      return num3 
      return den3 

    def math3(a,b): 
     if den1 == den2: 
      num3 = num1 - num2 
      den3 = den1 
      return num3 
      return den3 

     elif den1 != den2: 
      den3 = den1 * den2 
      num1 = num1 * den2 
      num2 = num2 * den1 
      num3 = num1 - num2 
      return num3 
      return den3 

    def math4(a,b): 
      num3 = num1 * num2 
      den3 = den1 * den2 
      return num3 
      return den3 

    def math5(a,b): 
      num3 = num1 * den2 
      den3 = den1 * num2 
      return num3 
      return den3 

    def math6(a,b): 
      num3 = num1.fractions().numerator() ** 2 
      den3 = den1.fractions().denominator() ** 2 
      return num3 
      return den3    

    def reduce(a,b): 
     maxnum = 1000 
     while maxnum > 0: 
      if num3 % maxnum == 0 and den3 % maxnum == 0: 
       num3 = num3/maxnum 
       den3 = den3/maxnum 
      maxnum = maxnum - 1 
     return num3 
     return den3 

def main(): 
    start = menu.question() 
    ask = menu.ask() 

    Numer = fractions.numerator() 

    Duner = fractions.denominator() 

    if menu.ask() == "A" or menu.ask() == "a": 
     math.math1(Numer, Duner) 
     num3 = math.math1(num3) 
     den3 = math.math1(den3) 

    elif menu.ask() == "B" or menu.ask() == "b": 
     math.math2(Numer, Duner) 
     num3 = math.math2(num3) 
     den3 = math.math2(den3) 

    elif menu.ask() == "C" or menu.ask() == "c": 
     math.math3(Numer, Duner) 
     num3 = math.math3(num3) 
     den3 = math.math3(den3) 

    elif menu.ask() == "D" or menu.ask() == "d": 
     math.math4(Numer, Duner) 
     num3 = math.math4(num3) 
     den3 = math.math4(den3) 

    elif menu.ask() == "E" or menu.ask() == "e": 
     math.math5(Numer, Duner) 
     num3 = math.math5(num3) 
     den3 = math.math5(den3) 

    elif menu.ask() == "F" or menu.ask() == "f": 
     math.math6(Numer, Duner) 
     num3 = math.math6(num3) 
     den3 = math.math6(den3) 

    math.reduce(num3, den3) 

    print(num3, '/', den3) 

main() 

if文の最初のセットは、大文字と小文字の両方でa〜fの文字をカバーします。

Answer 1

menu.ask()を複数回呼び出しています。あなたがそれに書かれているたびに、 if menu.ask() == 'a' or menu.ask() == 'A'...、それは（その/が短絡しない限り）その関数を呼び出して、入力を求めます。その代わり、一度それを呼び出して、それを保存します。

ask = menu.ask() 
if ask == 'b' or ask == 'B'... 
    ... 
elif ask == 'a' or... 
    ... 

またはin演算子を使用します。

ask = menu.ask() 
if ask in 'bcdeBCDE': 
    ... 
elif ask in 'aAfF': 
    ... 

は、複数の入力検証の戦略のためのAsking the user for input until they give a valid responseを参照してください。