[Python] How to skip iteraction and referring the new one to two previous ones

I have a dictionaries with key having values for each time intervals. For each new time t, functions perform calculation by using dictionary values at t-1. Now, I have a problem with t 1681, which I want to skip.

Original:

for t in time:

ELZfarm_m_h2_production=0
ELZfarm_m_O2_production=0
h2_net_to_change_from_storage=0

# System consumption at t-1
# Power consumed by the ELZs
P_ELZ_inoperation_tbefore = sum(ELZmodule[key]['Power'][t-1] for key in ELZmodule.keys() ) # MW
# Power consumed by UTILITIES
Power_consump_utilities_Mw= sum(Power_consumption_utilities[key][t-1] for key in Power_consumption_utilities.keys() ) # MW
# Total Power consumed by the system
Power_consump_system_tot_Mw = P_ELZ_inoperation_tbefore + Power_consump_utilities_Mw # MW

# Determing the total Delta Power variation from t-1
Delta_P_system = Psolar[t] - Power_consump_system_tot_Mw # MW

# Positive Delta Power Variation
if Delta_P_system >= 0:
......


Idea:

for t in time:

if t == 1861:
continue

elif t == 1862:
t-1 = 1860

ELZfarm_m_h2_production=0
ELZfarm_m_O2_production=0
h2_net_to_change_from_storage=0

# System consumption at t-1
# Power consumed by the ELZs
P_ELZ_inoperation_tbefore = sum(ELZmodule[key]['Power'][t-1] for key in ELZmodule.keys() ) # MW
# Power consumed by UTILITIES
Power_consump_utilities_Mw= sum(Power_consumption_utilities[key][t-1] for key in Power_consumption_utilities.keys() ) # MW
# Total Power consumed by the system
Power_consump_system_tot_Mw = P_ELZ_inoperation_tbefore + Power_consump_utilities_Mw # MW

# Determing the total Delta Power variation from t-1
Delta_P_system = Psolar[t] - Power_consump_system_tot_Mw # MW

# Positive Delta Power Variation
if Delta_P_system >= 0:
......


I'm aware it cannot be written like that. Do you have any help for that?

Thanks for the collaboration.

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