题解 | 进制转换
import re
convert_dict = {'F':15,'E':14,'D':13,'C':12,'B':11,'A':10}
a = input()
pattern = re.compile(r"0x(.*)")
b = pattern.search(a)
c = b.group(1)
l = len(c)
result = 0
for i in range(l):
number = 0
try:
number = int(c[i])
except:
number = int(convert_dict[c[i]])
result += (16 ** (l-i-1)) * number
print(result)
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