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Python Regular Expressions in Python Introduction to Regular Expressions Players Dictionary and Class

Posted by Avery Uslaner
Avery Uslaner
15,099 Points

Not sure I understand the error here. Gives me: Bummer! __init__() got an unexpected keyword argument 'first_name'

I think it would be helpful to know how the object is being created.

players.py 
import re

string = '''Love, Kenneth: 20
Chalkley, Andrew: 25
McFarland, Dave: 10
Kesten, Joy: 22
Stewart Pinchback, Pinckney Benton: 18'''

players = re.search(r'''
  ^(?P<last_name>[\w\s]+),\s
  (?P<first_name>[\w\s]+):\s
  (?P<score>\d+)$
  ''', string, re.X|re.MULTILINE)

class Player(object):
  def __init__(self, first, last, score):
    self.last_name = last
    self.first_name = first
    self.score = sc

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,457 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,457 Points

The parameters of the __init__ need to match the group names from the players search

class Player(object):
  def __init__(self, first_name, last_name, score):  #<-- fixed parameter names
    self.last_name = last_name
    self.first_name = first_name
    self.score = score  # < - fixed typo
Avery Uslaner
Avery Uslaner
15,099 Points

So the names of my parameters actually matters? I thought I could name them anything so long as I assigned them to the correctly named attributes.

Chris Freeman
Chris Freeman
Treehouse Moderator 68,457 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,457 Points

Ideally, you can name the parameters anything you like, but since the order of the __init__ parameters were not specified, the method will be called using keyword arguments (kwargs).

In this challenge, the grader is using the output of players to create Player instances and calling __init__ with keywords based on the group names from the re.search output. So the parameters much match the group names.

James N
James N
17,864 Points
James N
James N
17,864 Points

thanks! this helped me, too!