def bisect_left(a, x, lo=0, hi=None):
 if (lo < 0):
  raise ValueError('lo must be non-negative')
 if (hi is None):
  hi = len(a)
 while (lo < hi):
  mid = ((lo + hi) // 2)
  if (a[mid] < x):
   lo = (mid + 1)
  else:
   hi = mid
 return lo

def bisect_left ( a , x , lo = 0 , hi = None ) : if ( lo < 0 ) : raise ValueError ( 'lo must be non-negative' ) if ( hi is None ) : hi = len ( a ) while ( lo < hi ) : mid = ( ( lo + hi ) // 2 ) if ( a [ mid ] < x ) : lo = ( mid + 1 ) else : hi = mid return lo
return the index where to insert item x in list a .