PCC51 ananda23-cs

Author: ananda23-cs

51/ananda23-cs/nba.py

@@ -0,0 +1,143 @@
+from collections import namedtuple
+import csv
+import os
+import sqlite3
+
+import requests
+
+DATA_URL = 'https://query.data.world/s/ezwk64ej624qyverrw6x7od7co7ftm'
+DATA_CACHED = 'nba.data'
+NBA_DB = 'nba.db'
+
+# start clean
+if os.path.isfile(NBA_DB):
+    os.remove(NBA_DB)
+
+Player = namedtuple('Player', ('name year first_year team college active '
+                               'games avg_min avg_points'))
+
+conn = sqlite3.connect(NBA_DB)
+cur = conn.cursor()
+
+
+def _get_csv_data():
+    """GIVEN:
+       Load in CSV data in from remote URL or local cache file"""
+    if os.path.isfile(DATA_CACHED):
+        with open(DATA_CACHED) as f:
+            return f.read()
+    else:
+        with requests.Session() as session:
+            return session.get(DATA_URL).content.decode('utf-8')
+
+
+def load_data():
+    """GIVEN:
+       Converts NBA CSV data into a list of Player namedtuples"""
+    content = _get_csv_data()
+    reader = csv.DictReader(content.splitlines(), delimiter=',')
+    for row in reader:
+        player = Player(name=row['Player'],
+                        year=row['Draft_Yr'],
+                        first_year=row['first_year'],
+                        team=row['Team'],
+                        college=row['College'],
+                        active=row['Yrs'],
+                        games=row['Games'],
+                        avg_min=row['Minutes.per.Game'],
+                        avg_points=row['Points.per.Game'])
+        yield player
+
+
+# CODE HERE (tests under __main__):
+
+def import_to_db(players=None):
+    """Create database table in sqlite3 and import the players data
+
+       required table SQL:
+       CREATE TABLE players (name, year, first_year, team, college,
+                             active, games, avg_min, avg_points)
+    """
+    if players is None:
+        players = list(load_data())
+    # you code ...
+    sql = '''CREATE TABLE players (name VARCHAR(255) NOT NULL, year INT NOT NULL, first_year INT NOT NULL, team VARCHAR(255) NOT NULL, college VARCHAR(255) NOT NULL, active INT NOT NULL, games INT NOT NULL, avg_min DOUBLE NOT NULL, avg_points DOUBLE NOT NULL)'''
+    cur.execute(sql)
+    for player in players:
+        insertSql = '''INSERT INTO players VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)'''
+        cur.execute(insertSql, (player.name, int(player.year), int(player.first_year), player.team, player.college, int(player.active), int(player.games), float(player.avg_min), float(player.avg_points)))
+
+
+def player_with_max_points_per_game():
+    """The player with highest average points per game (don't forget to CAST to
+       numeric in your SQL query)"""
+    sql = '''SELECT name FROM players WHERE avg_points = (SELECT MAX(avg_points) FROM players)'''
+    cur.execute(sql)
+    return cur.fetchone()[0]
+
+
+def number_of_players_from_duke():
+    """Return the number of players with college == Duke University"""
+    sql = "SELECT COUNT(*) FROM players WHERE college = 'Duke University'"
+    cur.execute(sql)
+    return cur.fetchone()[0]
+
+
+def percentage_of_players_first_year():
+    """Return 2 digit percentage of players whose first year it is
+       (first_year column)"""
+    sql = '''SELECT AVG(first_year) * 100.00 FROM players'''
+    cur.execute(sql)
+    return cur.fetchone()[0]
+
+
+def avg_years_active_players_stanford():
+    """Return the average years that players from "Stanford University
+       are active ("active" column)"""
+    sql = "SELECT AVG(active) FROM players WHERE college='Stanford University'"
+    cur.execute(sql)
+    return cur.fetchone()[0]
+
+
+def year_with_most_drafts():
+    """Return the year with the most drafts, in SQL you can use GROUP BY"""
+    sql = '''SELECT year, COUNT(*) FROM players GROUP BY year ORDER BY COUNT(*) DESC'''
+    cur.execute(sql)
+    ret = cur.fetchall()
+    return ret[0][0]
+
+
+def most_games_per_year_for_veterans():
+    """Top 6 players that are > 10 years active, that have the
+       highest # games / year"""
+    sql = '''SELECT name FROM players WHERE active > 10 ORDER BY games/active DESC LIMIT 6'''
+    cur.execute(sql)
+    return list(map(lambda f: f[0], cur.fetchall()))
+
+
+if __name__ == '__main__':
+    import_to_db()
+
+    # A. check if the import went well
+    def _verify_total_row_count_after_import():
+        sql = '''SELECT COUNT(*) FROM players'''
+        cur.execute(sql)
+        ret = cur.fetchall()
+        return ret[0][0]
+
+    assert _verify_total_row_count_after_import() == 3961
+
+    # B. some simple asserts of the data analysis functions
+    assert player_with_max_points_per_game() == 'Michael Jordan'
+
+    assert number_of_players_from_duke() == 58
+
+    assert round(avg_years_active_players_stanford(), 2) == 4.58
+
+    assert round(percentage_of_players_first_year(), 2) == 1.51
+
+    assert int(year_with_most_drafts()) == 1984
+
+    expected = ['A.C. Green', 'Alex English', 'Jack Sikma',
+                'John Stockton', 'Mark Eaton', 'Terry Tyler']
+    assert sorted(most_games_per_year_for_veterans()) == expected