擅长:python、mysql、java
<pre><code>def Step1(num):
total=0
for digit in num[-2:0:-2]:
digit=int(digit)
if int(num[digit])*2>=10:
x=int(num[digit])*2
x1=str(x)
x2=int(x1[0])+int(x1[1])
total+=x2
else:
x=int((num[digit]))
total+=x
return total
</code></pre>