Check halves

Def check_halves(s)
 S1=s[0:len(s)//2
 S2=s[len(s)//2:len(s)

 If not s1 or s2:
  Return 0
 Elif len(s1) == 1 and len(s2) == 1 and s1 == s2:
  Return 1
 Elif s1[0] != s2[0]:
  Return 0
 Else:
  Return check_halves(s1[1:]+s2[1:])