python 获取字符串中所有数字

s = "dede323frf54de23"
l = len(s)

numbers = []

i = 0
while i < l:
    num = ''
    symbol = s[i]
    while '0' <= symbol <= '9': # symbol.isdigit()
        num += symbol
        i += 1
        if i < l:
            symbol = s[i]
        else:
            break
    i += 1
    if num != '':
        numbers.append(int(num))

print(numbers)

　输出：

[323, 54, 23]