二进制，八进制，十六进制

a = 1234

b = bin(a)   # 字符串 0b10011010010
c = 0b10011010010
d = int(c)   # 1234

e = hex(a)  # 字符串 0x4d2
f = 0X4D2
g = int(f)   # 1234

h = oct(a)  # 字符串 02322
i = 02322 
j = int(i)    # 1234