find the index of minimum element in a list python

# function to find minimum and maximum position in list
def minimum(a, n):
  
    # inbuilt function to find the position of minimum 
    minpos = a.index(min(a))
      
    # inbuilt function to find the position of maximum 
    maxpos = a.index(max(a)) 
      
    # printing the position 
    print "The maximum is at position", maxpos + 1  
    print "The minimum is at position", minpos + 1