从字符串中找出最大的数字串，字符串中可以带小数点。--python实现

import re
input_str = "abcd123.4567.891.123yfdsa4567.54"
# 使用正则找出所有数字及下标
pattern = re.compile(r"d+")
s = pattern.finditer(input_str)
tmp = []
for i in s:
    tmp.append((i.group(), i.regs[0]))
# 求出最大的数及对应下标
max_int = max(map(int, [c[0] for c in tmp]))
tmp = [i for i in tmp if i[0]==str(max_int)]
print(tmp)
find = []
for t in tmp:
    inx = t[1][1]
    xiaoshu = ""
    _f = t[0]
    if len(input_str) != inx and input_str[inx] == ".":
        _inx = inx
        for c in range(len(input_str[inx+1:])):
            if input_str[_inx+1].isdigit():
                _inx += 1
            else:
                break
        xiaoshu = input_str[inx+1:_inx+1]
        print("xiaoshu:", xiaoshu)
    if xiaoshu:
        _f = t[0] + "."+xiaoshu
    find.append(_f)
print("===========")
find = max(map(float, find))
print(find)