在python字典中添加和访问键值

Question

I'm writing a python script that reads a players name and stats from a sentence in a .txt file, then updates their stats within a dictionary and then prints out their average stats. I'm having trouble with assigning multiple values to the same 'player' key, as well as getting the logic below it to correctly update the player stats. The .group part is giving me trouble too. How can I do this?

  import re, sys, os, math

if len(sys.argv) < 2:
    sys.exit("Usage: %s filename" % sys.argv[0])

filename = sys.argv[1]

if not os.path.exists(filename):
    sys.exit("Error: File '%s' not found" % sys.argv[1])

line_regex = re.compile(r"^(\w+ \w+) batted (\d+) times with (\d+) hits and (\d+) runs")
line = [line.strip() for line in open(filename)]

f = open (filename)

playerStats = {'players': [0, 0, 0]} 

for players in playerStats:
    player = line.group(1)
    atBat = line.group(2)
    hit = line.group(3)

    if player in playerStats:
            playerStats[player][0] += atBat
            playerStats[player][1] += hit

    if player not in players:
        player = line.group(1)
        playerStats[player][0] = atBat
        playerStats[player][1] = hit
        avgs = 0

    else: 
        playerStats[player][0] = player
        playerStats[player][0] = atBat
        playerStats[player][1] = hit
        playerStats[player][2] = 0

for player in players:
    avgs[player] = round(float(hits[player])/float(atBats[player]), 3) 

print "%s: %.3f" % (player, avgs[player])

Traceback (most recent call last): File "ba.py", line 19, in player = line.group(1) AttributeError: 'list' object has no attribute 'group'

Answer 1

You should change this

playerStats = {'players': hits, atBats, avgs} 

To

playerStats = {'players': [0, 0, 0]} 

The latter stores the value as a list , the former is not valid Python syntax.

To modify one of these values you would do, for example

playerStats[player][1] = 5   # atBat value

You could also change to a nested structure like

playerStats = {'players': {'hits' : 0,
                           'atBats' : 0,
                           'avgs' : 0)}

Then you could modify the values as

playerStats[player]['hits'] = 3