我的python腳本有什麼問題？

Question

所以，這裏是我的腳本：

#Imports 
import decimal 
#variables 
neweq = "neweq" 
on = 1 
#loop 
while on > 0: 
#equasion function 
    def eq(): 
     global b 
     b = input("Please enter an equation (Example: 10*(3*a)==4*(7*a), or 3.0/7.0). Unfortunately however, you can only use the variable 'a'. Also, you can type 'exit' to quit: ") 
     print "" 
     print "" 
     print "" 
     print "" 
     b = float(b) 
     b = '%.3f'%(b) 
     if (b==exit): 
      print "" 
      print "" 
      print "" 
      print "" 
      print "" 
      print "" 
      print "" 
      print "" 
      exit ("Thank you for using me :)") 
#input funcution 
    def inp(): 
     a = input("Enter numeral (Example: 1, or 1.5) to proceed, 'exit' to quit, or 'neweq' to enter a new equasion: ") 
     if (a==exit): 
      print "" 
      print "" 
      print "" 
      print "" 
      print "" 
      print "" 
      print "" 
      print "" 
      print "" 
      exit ("Thank you for using me :)") 
     if (a == neweq): 
      print "" 
      print "" 
      a = 0 
      eq() 
      inp() 
     if (b==a): 
      print "" 
      print "Yes, the answer is", a 
      print "" 
      print "" 
      eq() 
     else: 
      print "" 
      print "No, the answer is not", a 
      print "" 
      print "" 
      print "test line", b 
      inp() 
#function calls 
    eq() 
    inp() 

的問題？

Please enter an equation (Example: 10*(3*a)==4*(7*a), or 3.0/7.0). Unfortunately however, you can only use the variable 'a'. Also, you can type 'exit' to quit: 2.0/4.0 




Enter numeral (Example: 1, or 1.5) to proceed, 'exit' to quit, or 'neweq' to enter a new equasion: 1/2 

No, the answer is not 0 


test line 0.500 
Enter numeral (Example: 1, or 1.5) to proceed, 'exit' to quit, or 'neweq' to enter a new equasion: 102.0 

No, the answer is not 102.0 


test line 0.500 
Enter numeral (Example: 1, or 1.5) to proceed, 'exit' to quit, or 'neweq' to enter a new equasion: 1.0/2.0 

No, the answer is not 0.5 


test line 0.500 
Enter numeral (Example: 1, or 1.5) to proceed, 'exit' to quit, or 'neweq' to enter a new equasion: .500 

No, the answer is not 0.5 


test line 0.500 
Enter numeral (Example: 1, or 1.5) to proceed, 'exit' to quit, or 'neweq' to enter a new equasion: 0 

No, the answer is not 0 


test line 0.500 
Enter numeral (Example: 1, or 1.5) to proceed, 'exit' to quit, or 'neweq' to enter a new equasion: 4.0/2.0 

No, the answer is not 2.0 


test line 0.500 
Enter numeral (Example: 1, or 1.5) to proceed, 'exit' to quit, or 'neweq' to enter a new equasion: 2.0/4.0 

No, the answer is not 0.5 


test line 0.500 
Enter numeral (Example: 1, or 1.5) to proceed, 'exit' to quit, or 'neweq' to enter a new equasion: 0.500 

No, the answer is not 0.5 


test line 0.500 
Enter numeral (Example: 1, or 1.5) to proceed, 'exit' to quit, or 'neweq' to enter a new equasion: 

它應該返回'是的，答案是0.5'，但是，它不是。與其他幾個類似。我無法弄清楚它有什麼問題，但是，我懷疑它是b = '%.3f'%(b)，這就是我需要幫助的地方。

謝謝！

Answer 1

你去那裏。我編輯了你的代碼。讓我知道如果這是你想要的，我不知道你爲什麼使用print ""，我在這裏刪除它，因爲它傷害了我的眼睛！ ：P。也請不要使用exit作爲用戶的輸入，最好使用「quit」。可在評論中找到解釋。

#Imports 
import decimal 
#variables 
neweq = "neweq" 
on = 1 
#loop 
#equasion function 
def eq(): 
     global b 
     b = input("Please enter an equation (Example: 10*(3*a)==4*(7*a), or 3.0/7.0). Unfortunately however, you can only use the variable 'a'. Also, you can type 'exit' to quit: ") 
     if b == exit: 
      exit ("Thank you for using me :)") 
     else: 
      b = float(b)  ## input converted into float. 
      b = '%.3f'%(b)  ## after this b would be of type string 
      b = float(b)  ## again converting into float to match with "a" in `inp()` 
#input funcution 
def inp(): 
     a = input("Enter numeral (Example: 1, or 1.5) to proceed, 'exit' to quit, or 'neweq' to enter a new equasion: ") 
     if a == exit: 
      exit ("Thank you for using me :)") 
     if a == neweq: 
      a = 0 
      eq() 
      inp() 
     if b == a:   ## if a == b should work now. 
      print "Yes, the answer is", a 
      eq() 
     else: 
      print "No, the answer is not", a 
      print "test line", b 
      inp() 
#function calls 
eq() 
inp() 

如果你使用print""以避免在工作空間雜波然後嘗試這樣

print "\n"*5 ## You have 5 empty lines. Replace the number 5 as per your needs 

這是更加整潔Python的。

Answer 2

該位看起來可疑，它需要（大概）一個字符串，並試圖將其轉換爲float：

b = input("Please enter an equation (Example: 10*(3*a)==4*(7*a), or 3.0/7.0). Unfortunately however, you can only use the variable 'a'. Also, you can type 'exit' to quit: ") 
    b = float(b)