parameters: (y1, y2)
return_statement: return (y2//4 - y1//4) - (y2//100 - y1//100) + (y2//400 - y1//400)
docstring: Return number of leap years in range [y1, y2).
         Assume y1 <= y2.
docstring_summary: Return number of leap years in range [y1, y2).
         Assume y1 <= y2.
docstring_tokens: Return number of leap years in range [ y1 y2 ) . Assume y1 < = y2 .
function: def leapdays(y1, y2):
      """Return number of leap years in range [y1, y2).
         Assume y1 <= y2."""
      y1 -= 1
      y2 -= 1
      return (y2//4 - y1//4) - (y2//100 - y1//100) + (y2//400 - y1//400)
function_tokens: def leapdays ( y1 , y2 ) : y1 -= 1 y2 -= 1 return ( y2 // 4 - y1 // 4 ) - ( y2 // 100 - y1 // 100 ) + ( y2 // 400 - y1 // 400 )