if else one liner in python

a=0
b=0
s="1110000"
for i in range(len(s)):
   if s[i]=='1':
      a+=1
   else:
      b+=1

this if else I need to write in one line. I tried below way it is not working.

a+=1 if if s[i]=='1' else b+=1

PLease help me on this