[問題] ValueError: substring not found
我想要把所有'a'的index找出，我知道有正規畫表示法，
但在自己在試寫的時候出現了下面問題，請幫忙解惑，感謝大家!
x = 'An apple a day, keeps the doctor away'
i= 0
j = []
while x.index('a',i) is not None:
i = x.index('a',i) + 1
j.append(x.index('a',i))
print(j) #如果這邊往左移，不放在while迴圈內則會不顯示j序列，不知道為什麼@@!
----------------------------------------------------------------------------
Out:
[9]
[9, 12]
[9, 12, 33]
[9, 12, 33, 35]
Traceback (most recent call last):
File "C:/Users/cash.chien/PycharmProjects/element_number/test.py", line 7,
in <module>
j.append(x.index('a',i))
ValueError: substring not found
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