题解 | 进制转换

from hashlib import new
import sys



numdict = {'0':0,'1':1,'2':2,'3':3,'4':4,'5':5,'6':6,'7':7,
           '8':8,'9':9,'A':10,'B':11,'C':12,'D':13,'E':14,'F':15}

a = ''
for line in sys.stdin:
    a = line.split()[0]
    # 方法一
    # print(int(a,16))
    # 方法二
    n = len(a)-2
    num = 0
    for index,word in enumerate(a[2:]):
        # num += numdict[word]*16**(n-1)
        # 方法3
        num += numdict[word]*pow(16,n-1)
        n -= 1
    print(num)