替換python文本文件中的行

Question

我想替換我的文本文件中的某一行，該怎麼做？這裏是文本文件：

Description,Shoe Size,Quantity 
Reebok 111,11,2 
Reebok 111,12,4 
Reebok 111,9,10 
Reebok 1301,6,4 
Reebok 1301,7,4 
Reebok 1301,8,4 
Reebok 1301,9,4 
Reebok 1301,10,40 
Reebok A55,8,7 
Reebok A55,9,8 
Reebok A55,10,41 
Asics 193ABC,10,20 
Asics 193ABC,12,4 
Asics 193ABC,9,10 
Asics 293BC,11,2 
Asics 293BC,12,42 
Asics 293BC,9,100 
Nike N1,6,6 
Nike N1,7,4 
Nike N1,8,2 
Nike N1,9,4 
Nike N1,10,40 
Mizuno P1039,4,12 
Mizuno P1039,7,9 
Mizuno P1039,8,2 
Mizuno P1039,19,8 
Mizuno P1039,20,4 

Flag for copyright 

這是我到目前爲止已經完成，但這隻在後面

def modifyQty(dbfilename,modelname,size,newcount): 
    o=open(dbfilename,'a') 
    dbfilename=open(dbfilename,'r')#opendatafile for read and reassign 
    for line in dbfilename: 
     values=line.split(',')#split by comma 
     if values[0]==modelname and values[1]==size: 
      line=line.replace(values[2],newcount) 
      o.write(line+'\n') 
    o.close() 

modifyQty('shoes.txt','Reebok 111','11','1') 

我想編輯的第一線，這是銳步111添加一行，11，2到銳步111,11,1，尋找匹配的模型和尺寸，只改變數量。因此所需的輸出是：

Reebok 111, 11, 1 

感謝

---

這裏是我做的，它創造了shoes.txt的編輯版本

def modifyQty(dbfilename,modelname,size,newcount): 
    o = open(dbfilename, 'r') 
    new_file = open('shoestextcopy.txt', 'w') #opens lol file 
    data = o.readlines() 
    for line in data: 
     values = line.split(',') # split by comma 
     if values[0] == modelname and values[1] == size: 
      line = line.replace(values[2], newcount) 
     new_file.write(line) 
    o.close() 
    new_file.close() 
modifyQty('shoes.txt','Reebok 111','11','100000000 \n') 

感謝一個新的文本文件所有的幫助

Answer 1

我會建議打開一個新的文件寫作：

def modifyQty(dbfilename,modelname,size,newcount): 
    o = open(dbfilename, 'r') 
    new_file = open('abc.txt', 'w') 
    data = o.readlines() 
    for line in data: 
     values = line.split().split(',') # split by comma 
     if values[0] == modelname and values[1] == size: 
      line = line.replace(values[2], newcount) 
     new_file.write(line + '\n') 
    o.close() 
    new_file.close() 

modifyQty('shoes.txt','Reebok 111','11','1')