我正在尝试编写一个程序来查询数据库。数据库是 golfDB，它由一个名为 player 的表组成，其中包含 5 个字段：name（球员姓名）、totalGross（每轮总得分的总和）、totalRounds（打出的轮数）、pars（完成的总杆数） ，和小鸟（小鸟的总数。我的程序需要输出具有最多标准杆的球员，输入球员的平均得分（totalGross/totalRounds），并按照总得分从低到高的顺序列出球员. 现在我还没有真正研究具有最多 pars 函数或排序分数的函数的播放器。我的平均分数函数有问题。我收到这个错误，我真的不确定如何修理它：
Traceback (most recent call last):
File "/Users/tinydancer9454/Documents/python/golfDBuserInterface.py", line 46, in <module>
main()
File "/Users/tinydancer9454/Documents/python/golfDBuserInterface.py", line 40, in main
queryDBavgScore(cursor)
File "/Users/tinydancer9454/Documents/python/golfDBuserInterface.py", line 29, in queryDBavgScore
answer = totalGrossScore/ totalRoundsScore
TypeError: unsupported operand type(s) for /: 'tuple' and 'tuple'
到目前为止，这是我的代码：
import sqlite3
def getDBCursor(DB):
"""obtain and return a cursor for the database DB"""
conn= sqlite3.connect('/Users/tinydancer9454/Documents/python/golfDB')
cursor= conn.cursor()
return cursor
def queryDBpars(cursor):
"""find out which player had the most pars"""
cursor.execute('select name from players where pars >= 0')
def queryDBavgScore(cursor):
"""find the average score of inputed player"""
player= input("Please enter the player's name: ")
cursor.execute('select totalGross from players where name = ?', (player,))
totalGrossScore = cursor.fetchone()
cursor.execute('select totalRounds from players where name = ?', (player,))
totalRoundsScore = cursor.fetchone()
answer = totalGrossScore/ totalRoundsScore
print('The average score for', player, 'is', answer)
def queryDBplayers(cursor):
"""lists the players in order of their total gross score"""
def main():
"""obtain cursor and query the database: golfDB"""
cursor= getDBCursor('golfDB')
queryDBpars(cursor)
queryDBavgScore(cursor)
queryDBplayers(cursor)
cursor.close()