程序只打印最后一行lis

Question

你好，我试图让这个程序打印出在底部的类调用中输入的走廊的列表数据。但它只打印出列表中的最后一行。这个程序接受一个.csv文件并转换成一个列表。绝对不是一个经验丰富的python程序员。在

class csv_get(object): # class to being in the .csv file to the program
     import os
     os.chdir('C:\Users\U2970\Documents\ArcGIS')
     gpsTrack = open('roadlog_intersection_export_02_18_2014_2.csv', 'rb')
     # Figure out position of lat and long in the header
     headerLine = gpsTrack.readline()
     valueList = headerLine.split(",")

class data_set(object): # place columns from .csv file into a python dictionary
    dict = {'DESC' : csv_get.valueList.index("TDD_DESC"),
    'ROUTE_NAME' : csv_get.valueList.index("ROUTE_NAME"),
    'CORRIDOR': csv_get.valueList.index("CORRIDOR"),
    'ROADBED': csv_get.valueList.index("DC_RBD"),
    'BEG_RP': csv_get.valueList.index("BEG_RP"),
    'END_RP': csv_get.valueList.index("END_RP"),
    'DESIGNATION': csv_get.valueList.index("NRLG_SYS_DESC")}

class columns_set(object): # append the dict into a list
    new_list = []
    for line in csv_get.gpsTrack.readlines():
        segmentedLine = line.split(",")
        new_list.append([segmentedLine[data_set.dict['DESC']],\
        '{:>7}'.format(segmentedLine[data_set.dict['ROUTE_NAME']]),\
        '{:>7}'.format(segmentedLine[data_set.dict['CORRIDOR']]),\
        '{:>7}'.format(segmentedLine[data_set.dict['ROADBED']]),\
        '{:>7}'.format(segmentedLine[data_set.dict['BEG_RP']]),\
        '{:>7}'.format(segmentedLine[data_set.dict['END_RP']]),\
        '{:>7}'.format(segmentedLine[data_set.dict['DESIGNATION']])])

class data: 
   def __init__(self,corridor):
       for col in columns_set.new_list: # for each column in the list new_list
            self.desc = col[0] 
            self.route = col[1]  # assigns column names to column numbers
            self.corridor = col[2] 
            self.roadbed = col[3]
            self.beg_rp = col[4] 
            self.end_rp = col[5] 
            self.designation = col[6] 

   def displayData(self): # print data for corridor number entered
       print self.desc,\
            self.route,\
            self.corridor,\
            self.roadbed,\
            self.beg_rp,\
            self.end_rp,\
            self.designation

set1 = data('C000021') # corridor number to be sent into data class
# should print all the corridor data but only prints very last record
set1.displayData() 

Answer 1

您只存储当前行中的数据，并用每一行覆盖它。像self.desc = col[0]这样的行表示“覆盖self.desc”，因此它引用col[0]的值。在

我不想这么说，但所有这些代码在根本层面上都是有缺陷的。你的类，除了data，都是真正的函数。甚至data也是有缺陷的，因为它从外部引入了硬连线元素。在

您确实应该使用Python的includedCSV module将CSV文件解析为列表列表。它甚至可以给你一个字典列表并处理标题行。在