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

Einars Vilnis
Einars Vilnis
8,050 Points

players.py

Hi Guys !

Could You please help me with this challenge. Sorry . What I meant is, I don't understand How to put 'players' in to a class I am lost this is what I came up with

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<name>(?P<last_name>[\w ]*),\s(?P<first_name>[\w ]*)):\s
       (?P<score>[\d]*)$
''', string, re.MULTILINE|re.X)

class Player:

    def __init__(self, last_name, first_name, score):
        self.last_name = last_name
        self.first_name = first_name
        self.score = score

    def player(self, string):
        players = re.compile(r'''
            ^(?P<name>(?P<last_name>[\w ]*),\s(?P<first_name>[\w ]*)):\s
            (?P<score>[\d]*)$
        ''', re.MULTILINE|re.X)

        for match in players.finditer(string):
            return ('{first_name} {last_name} <{score}>'.format(**match.groupdict()))
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

What is confusing you? In software development you need to formulate your questions succinctly. "What is meant by...", "I don't understand what this error means...."

Einars Vilnis
Einars Vilnis
8,050 Points

I updated my question, could you tell me, where is the problem? please?

3 Answers

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,441 Points

Your solution is very close. If using **kwargs you will need to unpack them, but if the challenge calls your __init__() method without key word arguments, it will fail.

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

class Player():

  def __init__(self,  last_name, first_name, score): # <-- add expected parameters
    self.last_name = last_name  #<-- add missing right-hand expression
    self.first_name = first_name
    self.score = score

The __init__ parameters could also have been written using default values

  def __init__(self,  last_name='last_name', first_name='first_name', score='score'):
Einars Vilnis
Einars Vilnis
8,050 Points

this is my latest try. I must be missing some understanding it shows"init has got an unexpected argument 'name'"

class Player:


    def __init__(self, last_name, first_name, score):
        players = re.compile(r'''
            ^(?P<name>(?P<last_name>[\w ]*),\s(?P<first_name>[\w ]*)):\s
            (?P<score>[\d]*)$
        ''', re.MULTILINE|re.X)
        self.last_name = players.search(string).groupdict('last_name')
        self.first_name = players.search(string).groupdict('first_name')
        self.score = players.search(string).groupdict('score')
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

You don't need to re-evaluate the regex search for the 2nd part of the challenge. Simply assign the parameters to the class attributes.

Einars Vilnis
Einars Vilnis
8,050 Points

Sorry . What I meant is, I don't understand How to put 'players' in to a class

Einars Vilnis
Einars Vilnis
8,050 Points

Thank You! But I just don`t get it! I simply don't understand this

Einars Vilnis
Einars Vilnis
8,050 Points

Am I getting closer?

```class Player:

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

def __init__(self, **kwargs):
    self.last_name = players.group('last_name')
    self.first_name = players.group('first_name')
    self.score = players.group('score')
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

My original reply is a working solution. The biggest issue with your current solution is the way your are trying to use **kwargs.

Your code will only work if the challenge grader calls the __init__() method with keyword argument. Which it doesn't in this case. Look again at how I defined the parameters to the __init__() method.

With parameters passed to the __init__() method, you simply assign them each of the parameters directly to class attributes.

Lastly, the __init__() method doesn't need any regex coding.

Einars Vilnis
Einars Vilnis
8,050 Points

I must be missing something somewhere, coz i Just dont get it , this is my latest try

```class Player:

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

for match in players.finditer(string):
    print('{first_name} {last_name} <{score}>'.format(**match.groupdict()))

def __init__(self, last_name = 'last_name', first_name = 'first_name', score = 'score'):
    self.last_name = last_name
    self.first_name = first_name
    self.score = score
Chris Freeman
Chris Freeman
Treehouse Moderator 68,441 Points

In your latest attempt, you've replaced re.search() with re.compile() which breaks the first part of the challenge.

For the second part, you've removed the class Player() declaration, which breaks the second half. And you're still using regular expressions in the __init__() to recreated the parameter values. The values are already being set by the grader as it uses your re.search pattern to get the matching groups.

The code necessary to pass the challenge will not run on it's own (without the grader). The grader runs the code, then tries to create an instance of Player() using the output of the re.search. If the attributes are assigned correctly in the Player instance, the challenge passes.