Help with cycles for python

I'm doing a tour of a database in Firebase using for cycles for a school exercise:

This is the cycle that I occupy to be able to go through the database:

from firebse_login import *
fecha = "2018-09"

lista_mañana_r = []
lista_tarde_r = []

ref = db.reference("/")
ret = ref.get()

for key in ret.items():
    if key[0][0:7] == fecha:
        for k in key[1].items():
            if k[0] == sucursal:
                for s in k[1].items():
                    if s[0] == "Matutino":
                        for t_1 in s[1].items():
                            for u in t_1[1].items():
                                if u[0]=="recargas":
                                    if u[1] =="":
                                        #lista_mañana_r.append(0)
                                        a=0
                                    else:
                                        a=float(u[1].lstrip("$ "))
                                        #lista_mañana_r.append(float(u[1].lstrip("$ ")))
                        lista_mañana_r.append(a)

                    elif s[0] == "Vespertino":
                        for t_1 in s[1].items():
                            for u in t_1[1].items():
                                if u[0] =="recargas":
                                    if u[1] == "":
                                        lista_tarde_r.append(0)
                                    else:
                                        lista_tarde_r.append(float(u[1].lstrip("$ ")))

print(lista_mañana_r)

The result I want to obtain is a list of 13 items corresponding to the item Top-ups of the morning and evening shift

To obtain the list of 13 elements, the for cycle must take into account as morning noon the summed values of 11: 00,13: 00,15: 00 for putting an example, this would imply that the general morning value of the branch Exxe1 "2018-09-10" would be for example 20 and would be the same procedure for the afternoon

I hope to ententeder, I can not attach the link to the firebase database for security