20180805：把字符串所有的數字刪除 "a1b2c3b4d577777aab"

s = "a1b2c3b4d577777aab"
non_digit_list = []
for i in s:
    if i not in "0123456789":
        non_digit_list.append(i)

print("".join(non_digit_list))

 

輸出結果：

>>> print("".join(non_digit_list))
abcbdaab