Python索引錯誤超出範圍

Question

我需要爲不同部門的替代席位分配座位，但是當我嘗試去做時，我會收到錯誤。

下面我粘貼代碼：

#matrix for dept1 
X = [111, 222, 333, 444, 555, 666, 777 ,888, 999, 123, 234,345] 
#matrix for dept2 
Y = [1111, 2222, 3333, 4444, 5555, 6666, 7777, 8888, 9999,9876, 8765,7654] 
#empty class room which consist of 18 students 
class_room = [[0,0,0,0,0], 
     [0,0,0,0,0], 
     [0,0,0,0,0], 
     [0,0,0,0,0], 
     [0,0,0,0,0]] 


ca = 0 

pa = 0 

print 'combining dept1 and dept2 in alternative manner' 


for i in range(5): 

    for j in range(25): 

     if j%2 == 0: 
      class_room[i][j] = X[pa] 
      pa += 1 
     else: 
      class_room[i][j] = Y[ca] 
      ca += 1 

print class_room 

#error - Traceback (most recent call last): 
# File "C:\Users\SONY\workspace\mine\taest3.py", line 24, in <module> 
# class_room[i][j] = X[pa][pa] 
#IndexError: list index out of range 

好心幫我整頓和明確的。

Answer 1

你循環for j in range(25)，但你沒有什麼是25個元素長。相反，這樣做：

for i in range(5): 
    for j in range(5): # DIFFERENT 
     if (5 * i + j) % 2 == 0: # ALSO DIFFERENT 
      class_room[i][j] = X[pa] 
      pa += 1 
     else: 
      class_room[i][j] = Y[ca] 
      ca += 1 

注意，這將會推出新 IndexError，因爲你有25個教室，只有24 X和Y合併條目。將另一個元素添加到X，代碼將運行。