import pandas as pd
import re
from functools import wraps
from pyquery import PyQuery as pq
from .. import utils
from .constants import PLAYER_SCHEME, PLAYER_URL, ROSTER_URL
from six.moves.urllib.error import HTTPError
def _cleanup(prop):
try:
prop = prop.replace('%', '')
prop = prop.replace(',', '')
return prop.replace('+', '')
# Occurs when a value is of Nonetype. When that happens, return a blank
# string as whatever have come in had an incomplete value.
except AttributeError:
return ''
def _int_property_decorator(func):
@property
@wraps(func)
def wrapper(*args):
index = args[0]._index
prop = func(*args)
value = _cleanup(prop[index])
try:
return int(value)
except ValueError:
# If there is no value, default to None
return None
return wrapper
def _float_property_decorator(func):
@property
@wraps(func)
def wrapper(*args):
index = args[0]._index
prop = func(*args)
value = _cleanup(prop[index])
try:
return float(value)
except ValueError:
# If there is no value, default to None
return None
return wrapper
def _most_recent_decorator(func):
@property
@wraps(func)
def wrapper(*args):
season = args[0]._most_recent_season
seasons = args[0]._season
index = seasons.index(season)
prop = func(*args)
return prop[index]
return wrapper
[docs]class Player(object):
"""
Get player information and stats for all seasons.
Given a player ID, such as 'carsen-edwards-1' for Carsen Edwards, capture
all relevant stats and information like name, height/weight, career
three-pointers, last season's offensive rebounds, offensive points
contributed, and much more.
By default, the class instance will return the player's career stats, but
single-season stats can be found by calling the instance with the requested
season as denoted on sports-reference.com.
Parameters
----------
player_id : string
A player's ID according to sports-reference.com, such as
'carsen-edwards-1' for Carsen Edwards. The player ID can be found by
navigating to the player's stats page and getting the string between
the final slash and the '.html' in the URL. In general, the ID is in
the format 'first-last-N' where 'first' is the player's first name in
lowercase, 'last' is the player's last name in lowercase, and 'N' is a
number starting at '1' for the first time that player ID has been used
and increments by 1 for every successive player.
"""
def __init__(self, player_id):
self._most_recent_season = ''
self._index = None
self._player_id = player_id
self._season = None
self._name = None
self._team_abbreviation = None
self._conference = None
self._position = None
self._height = None
self._weight = None
self._games_played = None
self._games_started = None
self._minutes_played = None
self._field_goals = None
self._field_goal_attempts = None
self._field_goal_percentage = None
self._three_pointers = None
self._three_point_attempts = None
self._three_point_percentage = None
self._two_pointers = None
self._two_point_attempts = None
self._two_point_percentage = None
self._free_throws = None
self._free_throw_attempts = None
self._free_throw_percentage = None
self._offensive_rebounds = None
self._defensive_rebounds = None
self._total_rebounds = None
self._assists = None
self._steals = None
self._blocks = None
self._turnovers = None
self._personal_fouls = None
self._points = None
self._player_efficiency_rating = None
self._true_shooting_percentage = None
self._effective_field_goal_percentage = None
self._three_point_attempt_rate = None
self._free_throw_attempt_rate = None
self._points_produced = None
self._offensive_rebound_percentage = None
self._defensive_rebound_percentage = None
self._total_rebound_percentage = None
self._assist_percentage = None
self._steal_percentage = None
self._block_percentage = None
self._turnover_percentage = None
self._usage_percentage = None
self._offensive_win_shares = None
self._defensive_win_shares = None
self._win_shares = None
self._win_shares_per_40_minutes = None
self._offensive_box_plus_minus = None
self._defensive_box_plus_minus = None
self._box_plus_minus = None
self._parse_player_data()
self._find_initial_index()
def _retrieve_html_page(self):
"""
Download the requested player's stats page.
Download the requested page and strip all of the comment tags before
returning a pyquery object which will be used to parse the data.
Returns
-------
PyQuery object
The requested page is returned as a queriable PyQuery object with
the comment tags removed.
"""
url = PLAYER_URL % self._player_id
try:
url_data = pq(url)
except HTTPError:
return None
return pq(utils._remove_html_comment_tags(url_data))
def _parse_season(self, row):
"""
Parse the season string from the table.
The season is generally located in the first column of the stats tables
and should be parsed to denote which season metrics are being pulled
from.
Parameters
----------
row : PyQuery object
A PyQuery object of a single row in a stats table.
Returns
-------
string
A string representation of the season in the format 'YYYY-YY', such
as '2017-18'.
"""
return utils._parse_field(PLAYER_SCHEME, row, 'season')
def _combine_season_stats(self, table_rows, career_stats, all_stats_dict):
"""
Combine all stats for each season.
Since all of the stats are spread across multiple tables, they should
be combined into a single field which can be used to easily query stats
at once.
Parameters
----------
table_rows : generator
A generator where each element is a row in a stats table.
career_stats : generator
A generator where each element is a row in the footer of a stats
table. Career stats are kept in the footer, hence the usage.
all_stats_dict : dictionary
A dictionary of all stats separated by season where each key is the
season ``string``, such as '2017-18', and the value is a
``dictionary`` with a ``string`` of 'data' and ``string``
containing all of the data.
Returns
-------
dictionary
Returns an updated version of the passed all_stats_dict which
includes more metrics from the provided table.
"""
most_recent_season = ''
for row in table_rows:
season = self._parse_season(row)
try:
all_stats_dict[season]['data'] += str(row)
except KeyError:
all_stats_dict[season] = {'data': str(row)}
most_recent_season = season
self._most_recent_season = most_recent_season
try:
all_stats_dict['career']['data'] += str(next(career_stats))
except KeyError:
all_stats_dict['career'] = {'data': str(next(career_stats))}
return all_stats_dict
def _combine_all_stats(self, player_info):
"""
Pull stats from all tables into single data structure.
Pull the stats from all of the requested tables into a dictionary that
is separated by season to allow easy queries of the player's stats for
each season.
Parameters
----------
player_info : PyQuery object
A PyQuery object containing all of the stats information for the
requested player.
Returns
-------
dictionary
Returns a dictionary where all stats from each table are combined
by season to allow easy queries by year.
"""
all_stats_dict = {}
for table_id in ['players_totals', 'players_advanced']:
table_items = utils._get_stats_table(player_info,
'table#%s' % table_id)
career_items = utils._get_stats_table(player_info,
'table#%s' % table_id,
footer=True)
all_stats_dict = self._combine_season_stats(table_items,
career_items,
all_stats_dict)
return all_stats_dict
def _parse_player_information(self, player_info, field):
"""
Parse general player information.
Parse general player information such as height and weight. The
attribute for the requested field will be set with the value prior to
returning.
Parameters
----------
player_info : PyQuery object
A PyQuery object containing the HTML from the player's stats page.
field : string
A string of the attribute to parse, such as 'weight'.
"""
short_field = str(field)[1:]
value = utils._parse_field(PLAYER_SCHEME, player_info, short_field)
setattr(self, field, value)
def _parse_player_position(self, player_info):
"""
Parse the player's position.
The player's position isn't contained within a unique tag and the
player's meta information should be iterated through until 'Position'
is found as it contains the desired text.
Parameters
----------
player_info : PyQuery object
A PyQuery object of the player's information on the HTML stats
page.
Returns
-------
string
Returns a string of the player's position, such as 'Guard'.
"""
for section in player_info('div#meta p').items():
if 'Position' in str(section):
return section.text().replace('Position: ', '')
def _parse_conference(self, stats):
"""
Parse the conference abbreviation for the player's team.
The conference abbreviation is embedded within the conference name tag
and should be special-parsed to extract it.
Parameters
----------
stats : PyQuery object
A PyQuery object containing the HTML from the player's stats page.
Returns
-------
string
Returns a string of the conference abbreviation, such as 'big-12'.
"""
conference_tag = stats(PLAYER_SCHEME['conference'])
conference = re.sub(r'.*/cbb/conferences/',
'',
str(conference_tag('a')))
conference = re.sub(r'/.*', '', conference)
return conference
def _parse_team_abbreviation(self, stats):
"""
Parse the team abbreviation.
The team abbreviation is embedded within the team name tag and should
be special-parsed to extract it.
Parameters
----------
stats : PyQuery object
A PyQuery object containing the HTML from the player's stats page.
Returns
-------
string
Returns a string of the team's abbreviation, such as 'PURDUE' for
the Purdue Boilermakers.
"""
team_tag = stats(PLAYER_SCHEME['team_abbreviation'])
team = re.sub(r'.*/cbb/schools/', '', str(team_tag('a')))
team = re.sub(r'/.*', '', team)
return team
def _parse_player_data(self):
"""
Parse all player information and set attributes.
Pull the player's HTML stats page and go through each class attribute
to parse the data from the HTML page and set attribute value with the
result.
"""
player_info = self._retrieve_html_page()
all_stats_dict = self._combine_all_stats(player_info)
for field in self.__dict__:
short_field = str(field)[1:]
if short_field == 'player_id' or \
short_field == 'index' or \
short_field == 'most_recent_season':
continue
if short_field == 'name' or \
short_field == 'weight' or \
short_field == 'height':
self._parse_player_information(player_info, field)
continue
if short_field == 'position':
value = self._parse_player_position(player_info)
setattr(self, field, value)
continue
field_stats = []
for year, data in all_stats_dict.items():
stats = pq(data['data'])
if short_field == 'conference':
value = self._parse_conference(stats)
elif short_field == 'team_abbreviation':
value = self._parse_team_abbreviation(stats)
else:
value = utils._parse_field(PLAYER_SCHEME,
stats,
short_field)
field_stats.append(value)
setattr(self, field, field_stats)
def _find_initial_index(self):
"""
Find the index of career stats.
When the Player class is instantiated, the default stats to pull are
the player's career stats. Upon being called, the index of the 'Career'
element should be the index value.
"""
index = 0
for season in self._season:
if season == 'Career':
self._index = index
break
index += 1
def __call__(self, requested_season=''):
"""
Specify a different season to pull stats from.
A different season can be requested by passing the season string, such
as '2017-18' to the class instance.
Parameters
----------
requested_season : string (optional)
A string of the requested season to query, such as '2017-18'. If
left blank or 'Career' is passed, the career stats will be used for
stats queries.
Returns
-------
Player class instance
Returns the class instance with the updated stats being referenced.
"""
if requested_season.lower() == 'career' or \
requested_season == '':
requested_season = 'Career'
index = 0
for season in self._season:
if season == requested_season:
self._index = index
break
index += 1
return self
def _dataframe_fields(self):
"""
Creates a dictionary of all fields to include with DataFrame.
With the result of the calls to class properties changing based on the
class index value, the dictionary should be regenerated every time the
index is changed when the dataframe property is requested.
Returns
-------
dictionary
Returns a dictionary where the keys are the shortened ``string``
attribute names and the values are the actual value for each
attribute for the specified index.
"""
fields_to_include = {
'assist_percentage': self.assist_percentage,
'assists': self.assists,
'block_percentage': self.block_percentage,
'blocks': self.blocks,
'box_plus_minus': self.box_plus_minus,
'conference': self.conference,
'defensive_box_plus_minus': self.defensive_box_plus_minus,
'defensive_rebound_percentage': self.defensive_rebound_percentage,
'defensive_rebounds': self.defensive_rebounds,
'defensive_win_shares': self.defensive_win_shares,
'effective_field_goal_percentage':
self.effective_field_goal_percentage,
'field_goal_attempts': self.field_goal_attempts,
'field_goal_percentage': self.field_goal_percentage,
'field_goals': self.field_goals,
'free_throw_attempt_rate': self.free_throw_attempt_rate,
'free_throw_attempts': self.free_throw_attempts,
'free_throw_percentage': self.free_throw_percentage,
'free_throws': self.free_throws,
'games_played': self.games_played,
'games_started': self.games_started,
'height': self.height,
'minutes_played': self.minutes_played,
'offensive_box_plus_minus': self.offensive_box_plus_minus,
'offensive_rebound_percentage': self.offensive_rebound_percentage,
'offensive_rebounds': self.offensive_rebounds,
'offensive_win_shares': self.offensive_win_shares,
'personal_fouls': self.personal_fouls,
'player_efficiency_rating': self.player_efficiency_rating,
'player_id': self.player_id,
'points': self.points,
'points_produced': self.points_produced,
'position': self.position,
'steal_percentage': self.steal_percentage,
'steals': self.steals,
'team_abbreviation': self.team_abbreviation,
'three_point_attempt_rate': self.three_point_attempt_rate,
'three_point_attempts': self.three_point_attempts,
'three_point_percentage': self.three_point_percentage,
'three_pointers': self.three_pointers,
'total_rebound_percentage': self.total_rebound_percentage,
'total_rebounds': self.total_rebounds,
'true_shooting_percentage': self.true_shooting_percentage,
'turnover_percentage': self.turnover_percentage,
'turnovers': self.turnovers,
'two_point_attempts': self.two_point_attempts,
'two_point_percentage': self.two_point_percentage,
'two_pointers': self.two_pointers,
'usage_percentage': self.usage_percentage,
'weight': self.weight,
'win_shares': self.win_shares,
'win_shares_per_40_minutes': self.win_shares_per_40_minutes,
}
return fields_to_include
@property
def dataframe(self):
"""
Returns a ``pandas DataFrame`` containing all other relevant class
properties and values where each index is a different season plus the
career stats.
"""
temp_index = self._index
rows = []
indices = []
for season in self._season:
self._index = self._season.index(season)
rows.append(self._dataframe_fields())
indices.append(season)
self._index = temp_index
return pd.DataFrame(rows, index=[indices])
@property
def player_id(self):
"""
Returns a ``string`` of the player's ID on sports-reference, such as
'carsen-edwards-1' for Carsen Edwards.
"""
return self._player_id
@property
def season(self):
"""
Returns a ``string`` of the season in the format 'YYYY-YY', such as
'2017-18'. If no season was requested, the career stats will be
returned for the player and the season will default to 'Career'.
"""
return self._season[self._index]
@property
def conference(self):
"""
Returns a ``string`` of the abbreviation for the conference the team
participated in for the requested season.
"""
return self._conference[self._index]
@property
def name(self):
"""
Returns a ``string`` of the players name, such as 'Carsen Edwards'.
"""
return self._name
@_most_recent_decorator
def team_abbreviation(self):
"""
Returns a ``string`` of the abbrevation for the team the player plays
for, such as 'PURDUE' for Carsen Edwards.
"""
return self._team_abbreviation
@property
def position(self):
"""
Returns a ``string`` constant of the player's primary position.
"""
return self._position
@property
def height(self):
"""
Returns a ``string`` of the player's height in the format
"feet-inches".
"""
return self._height
@property
def weight(self):
"""
Returns an ``int`` of the player's weight in pounds.
"""
return int(self._weight.replace('lb', ''))
@_int_property_decorator
def games_played(self):
"""
Returns an ``int`` of the number of games the player participated in.
"""
return self._games_played
@_int_property_decorator
def games_started(self):
"""
Returns an ``int`` of the number of games the player started.
"""
return self._games_started
@_int_property_decorator
def minutes_played(self):
"""
Returns an ``int`` of the total number of minutes the player played.
"""
return self._minutes_played
@_int_property_decorator
def field_goals(self):
"""
Returns an ``int`` of the total number of field goals the player
scored.
"""
return self._field_goals
@_int_property_decorator
def field_goal_attempts(self):
"""
Returns an ``int`` of the total number of field goals the player
attempted during the season.
"""
return self._field_goal_attempts
@_float_property_decorator
def field_goal_percentage(self):
"""
Returns a ``float`` of the player's field goal percentage during the
season. Percentage ranges from 0-1.
"""
return self._field_goal_percentage
@_int_property_decorator
def three_pointers(self):
"""
Returns an ``int`` of the total number of three point field goals the
player made.
"""
return self._three_pointers
@_int_property_decorator
def three_point_attempts(self):
"""
Returns an ``int`` of the total number of three point field goals the
player attempted during the season.
"""
return self._three_point_attempts
@_float_property_decorator
def three_point_percentage(self):
"""
Returns a ``float`` of the player's three point field goal percentage
during the season. Percentage ranges from 0-1.
"""
return self._three_point_percentage
@_int_property_decorator
def two_pointers(self):
"""
Returns an ``int`` of the total number of two point field goals the
player made.
"""
return self._two_pointers
@_int_property_decorator
def two_point_attempts(self):
"""
Returns an ``int`` of the total number of two point field goals the
player attempted during the season.
"""
return self._two_point_attempts
@_float_property_decorator
def two_point_percentage(self):
"""
Returns a ``float`` of the player's two point field goal percentage
during the season. Percentage ranges from 0-1.
"""
return self._two_point_percentage
@_float_property_decorator
def effective_field_goal_percentage(self):
"""
Returns a ``float`` of the player's field goal percentage while giving
extra weight to 3-point field goals. Percentage ranges from 0-1.
"""
return self._effective_field_goal_percentage
@_int_property_decorator
def free_throws(self):
"""
Returns an ``int`` of the total number of free throws the player made
during the season.
"""
return self._free_throws
@_int_property_decorator
def free_throw_attempts(self):
"""
Returns an ``int`` of the total number of free throws the player
attempted during the season.
"""
return self._free_throw_attempts
@_float_property_decorator
def free_throw_percentage(self):
"""
Returns a ``float`` of the player's free throw percentage during the
season. Percentage ranges from 0-1.
"""
return self._free_throw_percentage
@_int_property_decorator
def offensive_rebounds(self):
"""
Returns an ``int`` of the total number of offensive rebounds the player
grabbed during the season.
"""
return self._offensive_rebounds
@_int_property_decorator
def defensive_rebounds(self):
"""
Returns an ``int`` of the total number of defensive rebounds the player
grabbed during the season.
"""
return self._defensive_rebounds
@_int_property_decorator
def total_rebounds(self):
"""
Returns an ``int`` of the total number of offensive and defensive
rebounds the player grabbed during the season.
"""
return self._total_rebounds
@_int_property_decorator
def assists(self):
"""
Returns an ``int`` of the total number of assists the player tallied
during the season.
"""
return self._assists
@_int_property_decorator
def steals(self):
"""
Returns an ``int`` of the total number of steals the player tallied
during the season.
"""
return self._steals
@_int_property_decorator
def blocks(self):
"""
Returns an ``int`` of the total number of shots the player blocked
during the season.
"""
return self._blocks
@_int_property_decorator
def turnovers(self):
"""
Returns an ``int`` of the total number of times the player turned the
ball over during the season for any reason.
"""
return self._turnovers
@_int_property_decorator
def personal_fouls(self):
"""
Returns an ``int`` of the total number of personal fouls the player
committed during the season.
"""
return self._personal_fouls
@_int_property_decorator
def points(self):
"""
Returns an ``int`` of the total number of points the player scored
during the season.
"""
return self._points
@_float_property_decorator
def player_efficiency_rating(self):
"""
Returns a ``float`` of the player's efficiency rating which represents
the player's relative production level. An average player in the league
has an efficiency rating of 15.
"""
return self._player_efficiency_rating
@_float_property_decorator
def true_shooting_percentage(self):
"""
Returns a ``float`` of the player's true shooting percentage which
takes into account two and three pointers as well as free throws.
Percentage ranges from 0-1.
"""
return self._true_shooting_percentage
@_float_property_decorator
def three_point_attempt_rate(self):
"""
Returns a ``float`` of the percentage of field goals that are shot from
beyond the 3-point arc. Percentage ranges from 0-1.
"""
return self._three_point_attempt_rate
@_float_property_decorator
def free_throw_attempt_rate(self):
"""
Returns a ``float`` of the number of free throw attempts per field goal
attempt.
"""
return self._free_throw_attempt_rate
@_int_property_decorator
def points_produced(self):
"""
Returns an ``int`` of the number of offensive points the player
produced.
"""
return self._points_produced
@_float_property_decorator
def offensive_rebound_percentage(self):
"""
Returns a ``float`` of the percentage of available offensive rebounds
the player grabbed. Percentage ranges from 0-100.
"""
return self._offensive_rebound_percentage
@_float_property_decorator
def defensive_rebound_percentage(self):
"""
Returns a ``float`` of the percentage of available defensive rebounds
the player grabbed. Percentage ranges from 0-100.
"""
return self._defensive_rebound_percentage
@_float_property_decorator
def total_rebound_percentage(self):
"""
Returns a ``float`` of the percentage of available rebounds the player
grabbed, both offensive and defensive. Percentage ranges from 0-100.
"""
return self._total_rebound_percentage
@_float_property_decorator
def assist_percentage(self):
"""
Returns a ``float`` of the percentage of field goals the player
assisted while on the floor. Percentage ranges from 0-100.
"""
return self._assist_percentage
@_float_property_decorator
def steal_percentage(self):
"""
Returns a ``float`` of the percentage of defensive possessions that
ended with the player stealing the ball while on the floor. Percentage
ranges from 0-100.
"""
return self._steal_percentage
@_float_property_decorator
def block_percentage(self):
"""
Returns a ``float`` of the percentage of opposing two-point field goal
attempts that were blocked by the player while on the floor. Percentage
ranges from 0-100.
"""
return self._block_percentage
@_float_property_decorator
def turnover_percentage(self):
"""
Returns a ``float`` of the average number of turnovers per 100
possessions by the player.
"""
return self._turnover_percentage
@_float_property_decorator
def usage_percentage(self):
"""
Returns a ``float`` of the percentage of plays the player is involved
in while on the floor. Percentage ranges from 0-100.
"""
return self._usage_percentage
@_float_property_decorator
def offensive_win_shares(self):
"""
Returns a ``float`` of the number of wins the player contributed to the
team as a result of his offensive plays.
"""
return self._offensive_win_shares
@_float_property_decorator
def defensive_win_shares(self):
"""
Returns a ``float`` of the number of wins the player contributed to the
team as a result of his defensive plays.
"""
return self._defensive_win_shares
@_float_property_decorator
def win_shares(self):
"""
Returns a ``float`` of the number of wins the player contributed to the
team as a result of his offensive and defensive plays.
"""
return self._win_shares
@_float_property_decorator
def win_shares_per_40_minutes(self):
"""
Returns a ``float`` of the number of wins the player contributed to the
team per 40 minutes of playtime. An average player has a contribution
of 0.100.
"""
return self._win_shares_per_40_minutes
@_float_property_decorator
def offensive_box_plus_minus(self):
"""
Returns a ``float`` of the number of offensive points per 100
possessions the player contributed in comparison to an average player
in the league.
"""
return self._offensive_box_plus_minus
@_float_property_decorator
def defensive_box_plus_minus(self):
"""
Returns a ``float`` of the number of defensive points per 100
possessions the player contributed in comparison to an average player
in the league.
"""
return self._defensive_box_plus_minus
@_float_property_decorator
def box_plus_minus(self):
"""
Returns a ``float`` of the total number of points per 100 possessions
the player contributed in comparison to an average player in the
league.
"""
return self._box_plus_minus
[docs]class Roster(object):
"""
Get stats for all players on a roster.
Request a team's roster for a given season and create instances of the
Player class for each player, containing a detailed list of the players
statistics and information.
Parameters
----------
team : string
The team's abbreviation, such as 'PURDUE' for the Purdue Boilermakers.
year : string (optional)
The 4-digit year to pull the roster from, such as '2018'. If left
blank, defaults to the most recent season.
"""
def __init__(self, team, year=None):
self._team = team
self._players = []
self._find_players(year)
def _pull_team_page(self, url):
"""
Download the team page.
Download the requested team's season page and create a PyQuery object.
Parameters
----------
url : string
A string of the built URL for the requested team and season.
Returns
-------
PyQuery object
Returns a PyQuery object of the team's HTML page.
"""
try:
return pq(url)
except HTTPError:
return None
def _create_url(self, year):
"""
Build the team URL.
Build a URL given a team's abbreviation and the 4-digit year.
Parameters
----------
year : string
The 4-digit string representing the year to pull the team's roster
from.
Returns
-------
string
Returns a string of the team's season page for the requested team
and year.
"""
return ROSTER_URL % (self._team.lower(), year)
def _get_id(self, player):
"""
Parse the player ID.
Given a PyQuery object representing a single player on the team roster,
parse the player ID and return it as a string.
Parameters
----------
player : PyQuery object
A PyQuery object representing the player information from the
roster table.
Returns
-------
string
Returns a string of the player ID.
"""
name_tag = player('th[data-stat="player"] a')
name = re.sub(r'.*/cbb/players/', '', str(name_tag))
return re.sub(r'\.html.*', '', name)
def _find_players(self, year):
"""
Find all player IDs for the requested team.
For the requested team and year (if applicable), pull the roster table
and parse the player ID for all players on the roster and create an
instance of the Player class for the player. All player instances are
added to the 'players' property to get all stats for all players on a
team.
Parameters
----------
year : string
The 4-digit string representing the year to pull the team's roster
from.
"""
if not year:
year = utils._find_year_for_season('ncaab')
url = self._create_url(year)
page = self._pull_team_page(url)
if not page:
output = ("Can't pull requested team page. Ensure the follow "
"URL exists: %s" % url)
raise ValueError(output)
players = page('table#roster tbody tr').items()
for player in players:
player_id = self._get_id(player)
player_instance = Player(player_id)
self._players.append(player_instance)
@property
def players(self):
"""
Returns a ``list`` of player instances for each player on the requested
team's roster.
"""
return self._players