csv文件比較differnces

Question

我有兩個csv文件（），我可以把它打印出來從CSV文件總結了總數的名單。我用這個代碼：

import csv 
import difflib 

file = open('test1.csv',"rb") #Open CSV File in Read Mode 
reader = csv.reader(file)  #Create reader object which iterates over lines 

class Object:     #Object to store unique data 
    def __init__(self, name, produce, amount): 
    self.name = name 
    self.produce = produce 
    self.amount = amount 

rownum = 0 #Row Number currently iterating over 
list = [] #List to store objects 

def checkList(name, produce, amount): 

for object in list: #Iterate through list   
    if object.name == name and object.produce == produce: #Check if name and produce  combination exists 
     object.amount += int(amount) #If it does add to amount variable and break out 
     return 

newObject = Object(name, produce, int(amount)) #Create a new object with new name, produce, and amount 
list.append(newObject) #Add to list and break out 


for row in reader: #Iterate through all the rows 
    if rownum == 0: #Store header row seperately to not get confused 
    header = row 
else: 
    name = row[0] #Store name 
    produce = row[1] #Store produce 
    amount = row[2] #Store amount 

    if len(list) == 0: #Default case if list = 0 
     newObject = Object(name, produce, int(amount)) 
     list.append(newObject) 
    else: #If not... 
     checkList(name, produce, amount) 


rownum += 1 

for each in list: 
    file1 = each.name, each.produce, each.amount #END OF FILE 1 


file = open('test2.csv',"rb") #Open CSV File in Read Mode 
reader = csv.reader(file)  #Create reader object which iterates over lines 

class Object:     #Object to store unique data 
    def __init__(self, name, produce, amount): 
    self.name = name 
    self.produce = produce 
    self.amount = amount 

rownum = 0 #Row Number currently iterating over 
list = [] #List to store objects 

def checkList(name, produce, amount): 

    for object in list: #Iterate through list   
    if object.name == name and object.produce == produce: #Check if name and produce combination exists 
     object.amount += int(amount) #If it does add to amount variable and break out 
     return 

newObject = Object(name, produce, int(amount)) #Create a new object with new name, produce, and amount 
list.append(newObject) #Add to list and break out 


for row in reader: #Iterate through all the rows 
    if rownum == 0: #Store header row seperately to not get confused 
    header = row 
else: 
    name = row[0] #Store name 
    produce = row[1] #Store produce 
    amount = row[2] #Store amount 

    if len(list) == 0: #Default case if list = 0 
     newObject = Object(name, produce, int(amount)) 
     list.append(newObject) 
    else: #If not... 
     checkList(name, produce, amount) 


rownum += 1 

for each in list: 
    file2 = each.name, each.produce, each.amount #END OF FILE 2 

所有這一切工作正常，我只要它只是讓你可以看到我在做什麼。

所以現在我需要讓我創建了兩個新的文件之間的差異。這是我堅持的地方;我試過，但沒有運氣

diff=difflib.ndiff('file1',"rb"), ('file2',"rb") 
try: 
    while 1: 
     print diff.next(), 

except: 
    pass 

我需要生成兩個新的文件之間的差異，所以我可以看到區別任何suggustions？當我運行它，我沒有錯誤，但沒有輸出

感謝

Answer 1

編輯：鑑於你earlier question，它似乎是你應該已經知道什麼是錯。

首先，你需要使用括號的正確數目。

diff = difflib.ndiff(('file1', 'rb'), ('file2', 'rb')) 

但這仍是不正確，因爲difflib.ndiff需要串的兩個列表，而不是名稱和未開封的文件模式。您需要將文件的內容讀入行列表。

a = open('file1', 'rb').read().splitlines() 
b = open('file2', 'rb').read().splitlines() 

for diff in difflib.ndiff(a, b): 
    print diff