如何將輸出中的列表中的兩個元素配對？

Question

所以我試圖做一個代碼來計算測驗中兩個玩家之間的分數差異。有第一輪比分和第二輪比分。

這是我到目前爲止有：

import math 

option = input ('How many players?: ') 

playerlist = [] 
firstroundlist = [] 
secondroundlist = [] 

j = 0 
while j < option: 
    name = raw_input('Enter player\'s name: ') 
    playerlist.append(name,) 

    firstround = input ('Enter first round score: ') 
    firstroundlist.append(firstround,) 

    secondround = input('Enter second round score: ') 
    secondroundlist.append(secondround,) 

    j += 1 

y=0 
z=1 
dis=[] 
while z<len(playerlist): 
    comparison = (firstroundlist[y]+secondroundlist[y])-(firstroundlist[z]+secondroundlist[z]) 
    print playerlist[y], '-', playerlist [z], 'is', comparison 
    z+=1 

z==0 
y+=1 

但是，讓我們說，我輸入了四種不同的球員得分，輸出此代碼會是這樣的：

Player 1 - Player 2 is #scoredifference 
Player 1 - Player 3 is #scoredifference 
Player 1 - Player 4 is #scoredifference 

的問題是，我該如何修改代碼，以便它會是這樣的：

Player 1 - Player 2 is #scoredifference 
Player 1 - Player 3 is #scoredifference 
Player 1 - Player 4 is #scoredifference 
Player 2 - Player 3 is #scoredifference 
Player 2 - Player 4 is #scoredifference 
Player 3 - Player 4 is #scoredifference 

Answer 1

for i in range(len(playerlist)): 
    for j in range(i+1, len(playerlist)): 
     print "player %d - player %d is %d", (i, j, scoredifference[i,j]) 

應該爲你做詭計。顯然，更換scoredifference用正確的公式..

Answer 2

您正在尋找itertools.combinations：

import itertools 
for y,z in itertools.combinations(range(len(playerlist)), 2): 
    comparison = (firstroundlist[y]+secondroundlist[y])-(firstroundlist[z]+secondroundlist[z]) 
    print (playerlist[y] + '-' + playerlist[z] + 'is' + str(comparison)) 

請注意，您的數據結構是不是最佳的。您應該使用的玩家信息tuples，像這樣：

import itertools 
playernum = int(raw_input('How many players?: ')) 
players = [(
    raw_input('Enter player\'s name: '), 
    int(raw_input('Enter first round score: ')), 
    int(raw_input('Enter second round score: ')), 
) for i in range(playernum)] 

for p,q in itertools.combinations(players, 2): 
    comparison = (p[1]+p[2])-(q[1]+q[2]) 
    print (p[0] + '-' + q[0] + 'is' + str(comparison)) 

順便說一句，你目前的代碼中包含語法錯誤。取而代之的

name = raw_input('Enter player's name: ') 

你想：

name = raw_input('Enter player\'s name: ') 

另外，代替input()（其中執行任意Python代碼！）你想int(raw_input())。