题解 | 进制转换
进制转换
https://www.nowcoder.com/practice/8f3df50d2b9043208c5eed283d1d4da6
import sys
p = sys.stdin.readline().strip()
if p.startswith("0x"):
p = p[2:]
result = 0
for i, y in enumerate(reversed(p)):
if '0' <= y <= '9':
num =ord(y) - ord('0')
elif 'A' <= y <= 'F':
num =10 + ord(y) - ord('A')
else:
continue
result += num * (16 ** i)
print(result)
#startswith对照前面的值，reversed()反转，enumerate()为元素添加索引，ord()字符对于的码
