Finding positive peaks of function

It is necessary to programatically find the number and location of positive peaks on the graph.
It is known that the number of peaks is odd. Typically, 3, 5 or 7. In this case, 3. It is also known that each positive peak follows negative.
How best to solve such a problem on Python? It is advisable without the selection of the
coefficients : the data always begins with a positive peak and end in negative.
Data is a vertical projection of the image treated with the function of np.gradient (projection)/projection . That is, the ratio of the second derivative of the function to its height.