IndentationError：インデントが外側のインデントレベルと一致しません

Question

File "first.py", line 37 
    elif(operation == "quadratic formula") 
IndentationError: unindent does not match any outer indentation level 

私のコードで何が問題なのか本当にわかりません。誰かが助けてくれますか？

def add(var1, var2): 
    return var1 + var2 

def sub(num1, num2): 
    return num1 - num2 

def div(num1, num2): 
    return num1/num2 

def mul(num1,num2): 
    return num1*num2 
def equation1(): 
import math 

a = int(raw_input("please enter your a in the equation: ")) 
b = int(raw_input("please enter your b in the equation: ")) 
c = int(raw_input("please enter your c in the equation: ")) 

d = b**2-4*a*c 

if(d < 0): 
    print "This equation has no real solution" 
elif(d == 0): 
    x = (-b+math.sqrt(b**2-4*a*c))/(2*a) 
    print "This equation has one solutions: ", x 
else: 
    x1 = (-b+math.sqrt(b**2-4*a*c))/(2*a) 
    x2 = (-b-math.sqrt(b**2-4*a*c))/(2*a) 
    print "This equation has two solutions" 
    print "The first soluition: ", x1 
    print "And the second solution", x2 

def main(): 
    operation = raw_input("what do you want to do (+,-,/,*) or quadratic 
    formula? ") 
    if(operation != '+' and operation != '-' and operation != '/' and operation != '*' and operation != 'quadratic formula'): 
     print 'You must put a valid operation' 
    elif(operation == "quadratic formula"): 
     equation1() 
    else: 
     var1 = int(raw_input("enter the first number: ")) 
     var2 = int(raw_input("enter the second number: ")) 
     if(operation == '+'): 
      print (add(var1, var2)) 
     elif(operation == '/'): 
      print (div(var1, var2)) 
     elif(operation == '-'): 
      print (sub(var1, var2)) 

Answer 1

以下はタブと空白文字と私のテキストエディタでコードを示しては、目に見える色の赤で示されました。ご覧のとおり、Pythonインタプリタを混乱させていることがわかります。私は4つのスペースが最高の（そしてほとんどのポータブルな）ものだとは思っていますが、どちらか一方に固執するのがベストです。

タブを適切なスペース数に自動的に変換するようにエディタを設定することができます。

更新：

それでも問題が解決しているように見えるので、ここではそのインデントは4空間を独占的に構成されている今、私はタブ文字を削除しているあなたのコードのバージョンがあります各レベルの文字。あなたがそれでより良い運を持っているかどうか見てください。

def add(var1, var2): 
    return var1 + var2 

def sub(num1, num2): 
    return num1 - num2 

def div(num1, num2): 
    return num1/num2 

def mul(num1,num2): 
    return num1*num2 

def equation1(): 
    import math 

    a = int(raw_input("please enter your a in the equation: ")) 
    b = int(raw_input("please enter your b in the equation: ")) 
    c = int(raw_input("please enter your c in the equation: ")) 

    d = b**2-4*a*c 

    if(d < 0): 
     print "This equation has no real solution" 
    elif(d == 0): 
     x = (-b+math.sqrt(b**2-4*a*c))/(2*a) 
     print "This equation has one solutions: ", x 
    else: 
     x1 = (-b+math.sqrt(b**2-4*a*c))/(2*a) 
     x2 = (-b-math.sqrt(b**2-4*a*c))/(2*a) 
     print "This equation has two solutions" 
     print "The first soluition: ", x1 
     print "And the second solution", x2 

def main(): 
    operation = raw_input("what do you want to do (+,-,/,*) or quadratic formula? ") 
    if(operation != '+' and operation != '-' and operation != '/' and operation != '*' and operation != 'quadratic formula'): 
     print 'You must put a valid operation' 
    elif(operation == "quadratic formula"): 
     equation1() 
    else: 
     var1 = int(raw_input("enter the first number: ")) 
     var2 = int(raw_input("enter the second number: ")) 
     if(operation == '+'): 
      print (add(var1, var2)) 
     elif(operation == '/'): 
      print (div(var1, var2)) 
     elif(operation == '-'): 
      print (sub(var1, var2))