UnboundLocalError：說變量沒有被使用

-1

當我運行我的遊戲功能我得到這個錯誤之前定義的：UnboundLocalError：說變量沒有被使用

Traceback (most recent call last): 
    File "<stdin>", line 2, in <module> 
    File "hog.py", line 162, in play 
    if is_swap(score0,score1)== True and who == 0: 
    File "hog.py", line 121, in is_swap 
    elif swap1 == score0: 
UnboundLocalError: local variable 'swap1' referenced before assignment

下面是錯誤引用的兩個功能（第一父，然後子功能）：

def play(strategy0, strategy1, score0=0, score1=0, goal=GOAL_SCORE): 
"""Simulate a game and return the final scores of both players, with 
Player 0's score first, and Player 1's score second. 

A strategy is a function that takes two total scores as arguments 
(the current player's score, and the opponent's score), and returns a 
number of dice that the current player will roll this turn. 

strategy0: The strategy function for Player 0, who plays first 
strategy1: The strategy function for Player 1, who plays second 
score0 : The starting score for Player 0 
score1 : The starting score for Player 1 
""" 
who = 0 # Which player is about to take a turn, 0 (first) or 1 (second) 
# BEGIN Question 5 
while score0 <= goal and score1 <= goal: 

    #Palyerx Turn 
    if who == 0: 
     score0 += take_turn(strategy0(score0,score1), score1, select_dice(score0,score1)) 
    elif who == 1: 
     score1 += take_turn(strategy1(score1,score0), score0, select_dice(score1,score0)) 
    print(score0,score1) 
    #Swine Swap 
    if is_swap(score0,score1)== True and who == 0: 
     temp = score0 
     score0 = score1 
     score1 = temp 
    elif is_swap(score1,score0) == True and who == 1: 
     temp = score1 
     score1 = score0 
     score0 = temp 

    who = other(who) 
# END Question 5 
return score0, score1 



def is_swap(score0, score1): 
    """Return True if ending a turn with SCORE0 and SCORE1 will result in a 
    swap. 

    Swaps occur when the last two digits of the first score are the reverse 
    of the last two digits of the second score. 
    """ 
    # BEGIN Question 4 
#If scores are equal there is no need to flip 
    if score0 == score1: 
     return True 
#Flipping Score0 
    if score0 >= 10 and score0 < 100: 
     s0String = str(score0) 
     x = s0String[0] 
     y = s0String[1] 
     swap0 = int(y+x) 
    elif score0 < 10: 
     x = '0' 
     y = str(score0) 
     swap0 = int(y+x) 
    elif score0 > 100: 
     s0String = str(score0) 
     x = s0String[0] 
     y = s0String[1] 
     z = s0String[2] 
     swap0 = int(z+y) 
#Flipping Score1 
    if score1 >= 10 and score1 < 100: 
     s1String = str(score1) 
     i = s1String[0] 
     j = s1String[1] 
     swap1 = int(j+i) 
    elif score1 < 10: 
     i = '0' 
     j = str(score1) 
     swap1 = int(j+i) 
    elif score1 > 100: 
     s1String = str(score1) 
     i = s1String[0] 
     j = s1String[1] 
     f = s1String[2] 
     swap1 = int(f+j) 
#Swapping Scores Bases on Flipped equivelence 
    if swap0 == score1: 
     return True 
    elif swap1 == score0: 
     return True 
    else: 
     return False

我不確定它想要什麼。因爲swap0在swap函數中被使用之前是defiend，並且它在播放中被正確調用。

來源

2016-09-15 Applesausce

因爲不管條件已設置的初始分配'swap1'沒有發生。因此，當它到達引發錯誤的行時：'swap1 == score0'，'swap1'從未被聲明並分配一個值。您需要修改您的條件語句以確保它們按預期行事。 – idjaw

您if/elif邏輯的分支無處理情況score1正好100這使得swap1不確定，導致你所描述的錯誤。

要避免這種情況，請確保您的不同條件覆蓋所有分支機構。如果您將最後一個分支定義爲else而非elif，這通常是最簡單的。您還可以通過更改您檢查一下它們的順序，這樣就簡化您的條件：

if score1 < 10: 
    i = '0' 
    j = str(score1) 
    swap1 = int(j+i) 
elif score1 < 100: 
    s1String = str(score1) 
    i = s1String[0] 
    j = s1String[1] 
    swap1 = int(j+i) 
else: # score1 >= 100 
    s1String = str(score1) 
    i = s1String[0] 
    j = s1String[1] 
    f = s1String[2] 
    swap1 = int(f+j)

來源

2016-09-15 00:57:29 Blckknght

謝謝，我現在對自己感到非常失望，謝謝 – Applesausce

UnboundLocalError：說變量沒有被使用

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