在Python中更新CSV文件

Question

我目前正在處理CSV文件創建編輯並追加到CSV文件我遇到的問題是我試圖更新到現有的CSV文件，但這樣做時遇到了麻煩。

當我運行代碼時我收到以下錯誤。

/usr/bin/python3.5 /home/usr/PycharmProjects/csv/csv_file.py 
2016-11-12 00:04:03.975247 
2016-11-11 23:59:17.591426 
MOD TIME IS Different 
Traceback (most recent call last): 
    File "/home/usr/PycharmProjects/csv/csv_file.py", line 157, in <module> 
    Direcotry_function(sys.argv) 
    File "/home/usr/PycharmProjects/csv/csv_file.py", line 133, in Direcotry_function 
    for row in reader: 
    File "/usr/lib/python3.5/csv.py", line 109, in __next__ 
    self.fieldnames 
    File "/usr/lib/python3.5/csv.py", line 96, in fieldnames 
    self._fieldnames = next(self.reader) 
_csv.Error: iterator should return strings, not bytes (did you open the file in text mode?) 

Process finished with exit code 1 

下面是Python代碼，我似乎無法工作。

def function(dest): 
    global directory_path #call the Global Variable 
    directory_path = os.getcwd() # getting Current Directory 
    if len(dest) > 1: 
     directory_path = dest 
    for list in filepath_list: 
     Originalfiles = ''.join(list)#Convert to Str 
     drive, path = os.path.splitdrive(Originalfiles)#Get the Path 
     path, filename = os.path.split(path)#Split the path and filename 
     makedir = path + '/' + filename 
     Originalfiles_Timestamp = os.path.getmtime(Originalfiles)#Get the Timestamp of File in seconds 
     mTime = datetime.datetime.fromtimestamp(Originalfiles_Timestamp)#Get the Date time in Month Yearformat 
     print(mTime) 
     if os.path.exists(os.path.join(directory_path, filename[:]+".copy")):#Check if the FIle exists 
      file_csv = csv.DictReader(open('datetime.csv'))#open CSV FILE 
      for row in file_csv:#Loop over 
       if row['FileName'] == Originalfiles: 
        rowTime = datetime.datetime.strptime(row['ModificationDate'], "%Y-%m-%d %H:%M:%S.%f") #Convert row to DateTime 
        print(rowTime) 
        if rowTime == mTime: #Check if Time inside CSV equals mTime 
         print("DATE IS THE SAME") 
         exit(1) 
        else:#if not equaled 
         print("MOD TIME IS Different") 
         global CSV_FILENAME 
         temp_file = NamedTemporaryFile(delete=False) 
         with open(CSV_FILENAME, "rb") as f, temp_file: 
          reader = csv.DictReader(f) 
          fieldnames = ['FileName', 'ModificationDate'] # Create Dict Keys 
          writer = csv.DictWriter(f, fieldnames=fieldnames) 
          for row in reader: 
           print(row) 
           writer.writerow({"FileName": row['FileName'], "ModificationDate": mTime}) 
          shutil(temp_file.name, CSV_FILENAME) 
         os.system('cp -rv ' + makedir + ' ' + directory_path + '/' + filename[:] + ".copy") 

       else: 
        with open('datetime.csv', 'a+') as f: 
         fieldnames = ['FileName', 'ModificationDate'] 
         writer = csv.DictWriter(f, fieldnames=fieldnames) 
         writer.writeheader()#WRITE KEYS 
         writer.writerow({'FileName': Originalfiles, 'ModificationDate': mTime})#WRITE Values 

     else: 
      #If Copy File Does not Exists in the Folder do the Following: 
      os.system('cp -r ' + makedir + ' ' + directory_path + '/' + filename[:]+".copy")#Copy ther File to the Directory 
      with open('datetime.csv', 'a+') as csvfile:#Open CSV File 
       fieldnames = ['FileName', 'ModificationDate']#Create Dict Keys 
       writer = csv.DictWriter(csvfile, fieldnames=fieldnames) 
       writer.writeheader() 
       writer.writerow({'FileName': Originalfiles, 'ModificationDate': mTime})#Write to The CSV File 

編輯：

所以守則玩弄後：我這樣做其工作是在某一點之後，這個問題我面對它不讀取整個datetime.csv如果我恰克東西在一個文件中我得到這個 它不給我test1的在temp.csv內

文件名，時間modificationdate /家庭的/ usr /桌面/ test23,2016-11-12 11：22：07.410170 文件名，時間modificationdate /home/usr/Desktop/test23,2016-11-12 11：22：07.410170 文件名，時間modificationdate /家庭的/ usr /桌面/ test23,2016-11-12 11：22：07.410170

def Direcotry_function(directory_dest): 
    global directory_path #call the Global Variable 
    directory_path = os.getcwd() # getting Current Directory 
    if len(directory_dest) > 1: 
     directory_path = directory_dest 
    for list in filepath_list: 
     Originalfiles = ''.join(list)#Convert to Str 
     drive, path = os.path.splitdrive(Originalfiles)#Get the Path 
     path, filename = os.path.split(path)#Split the path and filename 
     makedir = path + '/' + filename 
     Originalfiles_Timestamp = os.path.getmtime(Originalfiles)#Get the Timestamp of File in seconds 
     mTime = datetime.datetime.fromtimestamp(Originalfiles_Timestamp)#Get the Date time in Month Yearformat 
     print(mTime) 
     print(filename) 
     if os.path.exists(os.path.join(directory_path, filename[:]+".copy")):#Check if the FIle exists 
      file_csv = csv.DictReader(open('datetime.csv'))#open CSV FILE 
      for row in file_csv:#Loop over 
       if row['FileName'] == Originalfiles: 
        rowTime = datetime.datetime.strptime(row['ModificationDate'], "%Y-%m-%d %H:%M:%S.%f") #Convert row to DateTime 
        if rowTime == mTime: #Check if Time inside CSV equals mTime 
         print("same") 
        else: 
         with open('datetime.csv', "r") as f: 
          reader = csv.DictReader(f) 
          fieldnames = ['FileName', 'ModificationDate'] # Create Dict Keys 
          for row in reader: 
           with open("temp.csv", 'w') as g: 
            writer = csv.DictWriter(g, fieldnames=fieldnames) 
            writer.writeheader() 
            writer.writerow({"FileName": Originalfiles, "ModificationDate": mTime}) 
          #shutil.move("temp.csv", 'datetime.csv') 
         os.system('cp -rv ' + makedir + ' ' + directory_path + '/' + filename[:] + ".copy") 
     else: 
      #If Copy File Does not Exists in the Folder do the Following: 
      os.system('cp -r ' + makedir + ' ' + directory_path + '/' + filename[:]+".copy")#Copy ther File to the Directory 
      with open('datetime.csv', 'a') as csvfile:#Open CSV File 
       fieldnames = ['FileName', 'ModificationDate']#Create Dict Keys 
       writer = csv.DictWriter(csvfile, fieldnames=fieldnames) 
       writer.writeheader() 
       writer.writerow({'FileName': Originalfiles, 'ModificationDate': mTime})#Write to The CSV File 

Answer 1

的rb模式只應在二進制文件中。對於文本文件，只需使用r。