how to assign the max index of a list in python code example

Example 1: python find index of highest value in list

numbers = [5, 4, 7, 3, 9, 1, 2]
biggest_number = max(numbers)
print(numbers.index(biggest_number))

Example 2: index of max value of sequence python

a.index(max(a))
a.index(min(a))

mean.max()    
max_index = (np.argmax(mean, axis = 0) + 1)