make dictionary with duplicate keys in python
<p>I have the following list which contains duplicate car registration numbers with different values. I want to convert it into a dictionary which accepts this multiple keys of car registration numbers. So far when I try to convert list to dictionary it eliminates one of the keys. Can someone show me how to make dictionary with duplicate keys
The list is:</p>

<pre><code>EDF768, Bill Meyer, 2456, Vet_Parking
TY5678, Jane Miller, 8987, AgHort_Parking
GEF123, Jill Black, 3456, Creche_Parking
ABC234, Fred Greenside, 2345, AgHort_Parking
GH7682, Clara Hill, 7689, AgHort_Parking
JU9807, Jacky Blair, 7867, Vet_Parking
KLOI98, Martha Miller, 4563, Vet_Parking
ADF645, Cloe Freckle, 6789, Vet_Parking
DF7800, Jacko Frizzle, 4532, Creche_Parking
WER546, Olga Grey, 9898, Creche_Parking
HUY768, Wilbur Matty, 8912, Creche_Parking
EDF768, Jenny Meyer, 9987, Vet_Parking
TY5678, Jo King, 8987, AgHort_Parking
JU9807, Mike Green, 3212, Vet_Parking 
</code></pre>

<p>The code I have tried is:</p>

<pre><code>data_dict = {}
data_list = []

def createDictionaryModified(filename):
  path = "C:\Users\user\Desktop"
  basename = "ParkingData_Part3.txt"
  filename = path + "//" + basename
  file = open(filename)
  contents = file.read()
  print contents,"\n"
  data_list = [lines.split(",") for lines in contents.split("\n")]
  for line in data_list:
    regNumber = line[0]
    name = line[1]
    phoneExtn = line[2]
    carpark = line[3].strip()
    details = (name,phoneExtn,carpark)
    data_dict[regNumber] = details
  print data_dict,"\n"
  print data_dict.items(),"\n"
  print data_dict.values()
</code></pre>
