追加到文件和消息出現在錯誤的順序python

Question

我已經寫了一個程序，讀取一個由10對數字組成的文件，然後將這兩個文件分開，產生混合部分，然後將其添加到原始文檔。但是，我希望錯誤消息與對的順序相同。我的文件包括：

66 556 
-56 78 
43 76 
0 5 
6 5 
a 4 
98 76 
4 2 
66 54 
98 21 

，我的計劃是這樣的：

from fractions import gcd  
x=0 
y=0 
global index 
index=0 
wordlist=[] 
with open('topheavy.txt','r') as f: 
     for line in f: 
      for word in line.split(): 
       print(word) 
       wordlist.append(word) 
print (wordlist) 
print (len(wordlist)) 
def mixedfraction(): 
    global index 
    while index<len(wordlist): 
     global x 
     global y 
     x=wordlist[index] 
     y=wordlist[index+1] 
     neg=False 
     with open ('topheavy.txt','a') as g: 
      try: 
       float(x) 
      except ValueError: 
       g.write ('x is not a number.\n') 
       global index 
       index+=2 
       mixedfraction() 
      try: 
       float(y) 
      except ValueError: 
       g.write ('y is not a number.\n') 
       global index 
       index+=2 
       mixedfraction()  
    #the above code checks if its a number. 
     x=int(x) 
     y=int(y) 
     orx=0 
     ory=0 
     orx+=x 
     ory+=y 
     if x==0 or y==0: 
      with open ('topheavy.txt','a') as g: 
       g.write ('you cant divide by 0!\n') 
       global index 
       index+=2 
       mixedfraction() 
    #this is to make sure you dont get a divide by 0 error. 
     if x<0 and not y<0: 
      neg=True 
      x*=-1 
     elif y<0 and not x<0: 
      neg=True 
      y*=-1 
     if 1==1: 
      xy=(x//y) 
      modxy=(x%y) 
      modxy=round(modxy,0) 
      xy=round(xy,0) 
      y=round(y,0) 
      xdivisor=gcd(modxy, y) 
      modxy//=xdivisor 
      y//=xdivisor 
    #the above 3 lines reduce the fraction, as do the similar 3 lines in the other bit of code. 
      with open ('topheavy.txt','a') as g: 
       if modxy!=0 and xy!=0: 
        b= ('{}/{}={} and {}/{}\n'.format(orx,ory,xy, modxy, y )) 
        if neg==True: 
         b=(' {}/{}=-{} and {}/{}\n'.format(orx,ory,xy, modxy, y )) 
        g.write (b) 
       elif modxy==0 and xy!=0:  
        b= ('{}/{}={} \n'.format(orx,ory,xy)) 
        if neg==True: 
         b=(' {}/{}=-{} \n'.format(orx,ory,xy)) 
        g.write (b) 
       elif xy==0:   
        b=('{}/{}={}/{} \n'.format(orx,ory,modxy, y)) 
        if neg==True: 
         b=('{}/{}=-{}/{} \n'.format(orx,ory,modxy, y)) 
        g.write (b) 
    #this if clause stops the program from saying '5 and 0/5' or a similar thing. 
     global index 
     index=index+2 
mixedfraction() 

當我運行它，我得到這個：

66 556 
-56 78 
43 76 
0 5 
6 5 
a 4 
98 76 
4 2 
66 54 
98 2166/556=33/278 
-56/78=-28/39 
43/76=43/76 
6/5=1 and 1/5 
98/76=1 and 11/38 
4/2=2 
66/54=1 and 2/9 
98/21=4 and 2/3 
x is not a number. 
98/3=32 and 2/3 
you cant divide by 0! 
0/5=32 and 2/3 

的 '你不能除以0' 消息在錯誤的地方，'x不是數字'的信息也是如此。我不知道如何讓他們去正確的地方。然後在最後添加一些奇怪的隨機行，這不應該在那裏。我已經找遍了，找不到解決方案。謝謝你的幫助。

我要的是：

66 556 
-56 78 
43 76 
0 5 
6 5 
a 4 
98 76 
4 2 
66 54 
66/556=answer 
-56/78=answer 
43/76=answer 
you cant divide by 0! 
6/5=answer 
x is not a number! 
98/76=answer 
4/2= answer 
66/54=answer 

Answer 1

我的腳本被下面從文件中的數據：

66 556 
-56 78 
43 76 
0 5 
6 5 
a 4 
98 76 
4 2 
66 54 
98 21 

，並保存計算數據到同一個文件：

66 556 
-56 78 
43 76 
0 5 
6 5 
a 4 
98 76 
4 2 
66 54 
98 21 

66/556 = 33/278 
-56/78 = -28/39 
43/76 = 43/76 
0/5 = 0 
6/5 = 6/5 
a/4 = Not a number! 
98/76 = 49/38 
4/2 = 2 
66/54 = 11/9 
98/21 = 14/3 

這裏Python腳本：

from fractions import Fraction 
file = 'topheavy.txt' 
outputStr = '' 
flag = True 

with open(file, 'r') as f: 
     for line in f: 
      for word in line.split(): 
       if (flag): 
        dividend = word 
        flag = False 
       else: 
        divisor = word 
        try: 
         fraction = Fraction(int(dividend), int(divisor)) 
        except ZeroDivisionError: 
         fraction = "You can't divide by 0!" 
        except: 
         fraction = "Not a number!" 
        string = dividend + "/" + divisor + " = " + str(fraction) + "\n" 
        outputStr += string 
        flag = True 

f = open(file, 'a') 
f.write("\n\n" + outputStr) 
f.close()