Attribute error when trying to save simulation data

[MirAbbasAli2A]

Hello Pybamm Team -

I am encountering an error when trying to save variables from a pybamm simulation. Here is a minimum working example of the code where I run RPT experiment and cccv aging experiments simultaneously:

cccv_sols = []
rpt_sols = []
cccv_sol = None
rpt_sol = None

M = 7
for i in range(M):
sim = pybamm.Simulation(model, experiment=rpt_experiment,parameter_values=param, var_pts=var_pts, solver=solver)
rpt_sol = sim.solve(starting_solution=cccv_sol)
sim = pybamm.Simulation(model, experiment=cccv_experiment,parameter_values=param, var_pts=var_pts, solver=solver)
cccv_sol = sim.solve(starting_solution=rpt_sol, save_at_cycles= 10)
cccv_sols.append(cccv_sol)
rpt_sols.append(rpt_sol)

cccv_sol.save("1C60pdodcccv10xbeta_5C.pkl")

rpt_sol.save("1C60pdodrpt10xbeta_5C.pkl")

rpt_sol.save_data("1C60pdodrpt10xbeta_5C_dischcap.csv",["Discharge capacity [A.h]"], to_format="csv")

cccv_sol.save_data("1C60pdodcccv10xbeta_5C_soldata.csv",[

'Time [s]',

'Current variable [A]',

'Total current density [A.m-2]',

'Current [A]',

'C-rate',

'Discharge capacity [A.h]',

'Throughput capacity [A.h]',

'Discharge energy [W.h]',

'Throughput energy [W.h]',

'X-averaged negative electrode porosity',

'X-averaged separator porosity',

'X-averaged positive electrode porosity',

'X-averaged negative electrode interface utilisation variable',

'X-averaged negative electrode interface utilisation',

'X-averaged positive electrode interface utilisation variable',

'X-averaged positive electrode interface utilisation',

'X-averaged negative particle crack length [m]',

'X-averaged negative particle cracking rate [m.s-1]',

'X-averaged positive particle crack length [m]',

'X-averaged positive particle cracking rate [m.s-1]',

'X-averaged negative electrode active material volume fraction',

'Negative electrode capacity [A.h]',

'X-averaged negative particle radius [m]',

'X-averaged negative electrode surface area to volume ratio [m-1]',

'X-averaged negative electrode active material volume fraction change [s-1]',

'Loss of lithium due to loss of active material in negative electrode [mol]',

'X-averaged positive electrode active material volume fraction',

'Positive electrode capacity [A.h]',

'X-averaged positive particle radius [m]',

'X-averaged positive electrode surface area to volume ratio [m-1]',

'X-averaged positive electrode active material volume fraction change [s-1]',

'Loss of lithium due to loss of active material in positive electrode [mol]',

'X-averaged separator pressure [Pa]',

'X-averaged negative electrode transverse volume-averaged velocity [m.s-1]',

'X-averaged separator transverse volume-averaged velocity [m.s-1]',

'X-averaged positive electrode transverse volume-averaged velocity [m.s-1]',

'X-averaged negative electrode transverse volume-averaged acceleration [m.s-2]',

'X-averaged separator transverse volume-averaged acceleration [m.s-2]',

'X-averaged positive electrode transverse volume-averaged acceleration [m.s-2]',

'X-averaged negative electrode volume-averaged acceleration [m.s-2]',

'X-averaged negative electrode pressure [Pa]',

'X-averaged positive electrode volume-averaged acceleration [m.s-2]',

'X-averaged positive electrode pressure [Pa]',

'Average negative particle concentration [mol.m-3]',

'X-averaged negative particle surface concentration',

'X-averaged negative particle surface concentration [mol.m-3]',

'X-averaged negative electrode extent of lithiation',

'Minimum negative particle concentration [mol.m-3]',

'Maximum negative particle concentration [mol.m-3]',

'Minimum negative particle surface concentration [mol.m-3]',

'Maximum negative particle surface concentration [mol.m-3]',

'Average positive particle concentration [mol.m-3]',

'X-averaged positive particle surface concentration [mol.m-3]',

'X-averaged positive electrode extent of lithiation',

'Minimum positive particle concentration [mol.m-3]',

'Maximum positive particle concentration [mol.m-3]',

'Minimum positive particle surface concentration [mol.m-3]',

'Maximum positive particle surface concentration [mol.m-3]',

'X-averaged negative electrode potential [V]',

'X-averaged negative electrode ohmic losses [V]',

'X-averaged positive electrode potential [V]',

'X-averaged positive electrode ohmic losses [V]',

'Total lithium in electrolyte [mol]',

'X-averaged electrolyte potential [V]',

'X-averaged electrolyte overpotential [V]',

'X-averaged negative electrolyte potential [V]',

'X-averaged separator electrolyte potential [V]',

'X-averaged positive electrolyte potential [V]',

'Ambient temperature [K]',

'X-averaged cell temperature [K]',

'Volume-averaged cell temperature [K]',

'X-averaged SEI thickness [m]',

'X-averaged total SEI thickness [m]',

'X-averaged negative electrode resistance [Ohm.m2]',

'X-averaged SEI interfacial current density [A.m-2]',

'X-averaged SEI on cracks thickness [m]',

'X-averaged total SEI on cracks thickness [m]',

'X-averaged SEI on cracks interfacial current density [A.m-2]',

'X-averaged lithium plating concentration [mol.m-3]',

'X-averaged dead lithium concentration [mol.m-3]',

'X-averaged lithium plating thickness [m]',

'X-averaged dead lithium thickness [m]',

'Loss of lithium to lithium plating [mol]',

'Loss of capacity to lithium plating [A.h]',

'X-averaged negative electrode lithium plating reaction overpotential [V]',

'X-averaged lithium plating interfacial current density [A.m-2]',

'X-averaged negative electrode roughness ratio',

'X-averaged positive electrode roughness ratio',

'X-averaged negative electrolyte transport efficiency',

'X-averaged separator electrolyte transport efficiency',

'X-averaged positive electrolyte transport efficiency',

'X-averaged negative electrode transport efficiency',

'X-averaged separator electrode transport efficiency',

'X-averaged positive electrode transport efficiency',

'X-averaged separator volume-averaged acceleration [m.s-2]',

'X-averaged volume-averaged acceleration [m.s-1]',

'X-averaged negative electrode open-circuit potential [V]',

'X-averaged negative electrode entropic change [V.K-1]',

'X-averaged positive electrode open-circuit potential [V]',

'X-averaged positive electrode entropic change [V.K-1]',

'Positive current collector potential [V]',

'Voltage [V]',

'X-averaged negative electrolyte concentration [mol.m-3]',

'X-averaged separator electrolyte concentration [mol.m-3]',

'X-averaged positive electrolyte concentration [mol.m-3]',

'X-averaged negative electrolyte concentration [Molar]',

'X-averaged separator electrolyte concentration [Molar]',

'X-averaged positive electrolyte concentration [Molar]',

'X-averaged electrolyte concentration [mol.m-3]',

'X-averaged electrolyte concentration [Molar]',

'X-averaged concentration overpotential [V]',

'X-averaged electrolyte ohmic losses [V]',

'X-averaged negative electrode surface potential difference [V]',

'X-averaged positive electrode surface potential difference [V]',

'X-averaged Ohmic heating [W.m-3]',

'Volume-averaged Ohmic heating [W.m-3]',

'X-averaged irreversible electrochemical heating [W.m-3]',

'Volume-averaged irreversible electrochemical heating [W.m-3]',

'X-averaged reversible heating [W.m-3]',

'Volume-averaged reversible heating [W.m-3]',

'X-averaged total heating [W.m-3]',

'Volume-averaged total heating [W.m-3]',

'Current collector current density [A.m-2]',

'X-averaged inner SEI concentration [mol.m-3]',

'X-averaged outer SEI concentration [mol.m-3]',

'X-averaged SEI concentration [mol.m-3]',

'Loss of lithium to SEI [mol]',

'Loss of capacity to SEI [A.h]',

'X-averaged negative electrode SEI interfacial current density [A.m-2]',

'X-averaged positive electrode SEI volumetric interfacial current density [A.m-2]',

'X-averaged negative electrode SEI volumetric interfacial current density [A.m-3]',

'X-averaged inner SEI on cracks concentration [mol.m-3]',

'X-averaged outer SEI on cracks concentration [mol.m-3]',

'X-averaged SEI on cracks concentration [mol.m-3]',

'Loss of lithium to SEI on cracks [mol]',

'Loss of capacity to SEI on cracks [A.h]',

'X-averaged negative electrode SEI on cracks interfacial current density [A.m-2]',

'X-averaged positive electrode SEI on cracks volumetric interfacial current density [A.m-2]',

'X-averaged negative electrode SEI on cracks volumetric interfacial current density [A.m-3]',

'X-averaged negative electrode lithium plating interfacial current density [A.m-2]',

'X-averaged lithium plating volumetric interfacial current density [A.m-3]',

'X-averaged positive electrode lithium plating interfacial current density [A.m-2]',

'X-averaged positive electrode lithium plating volumetric interfacial current density [A.m-3]',

'X-averaged negative electrode lithium plating volumetric interfacial current density [A.m-3]',

'X-averaged negative electrode interfacial current density [A.m-2]',

'X-averaged negative electrode total interfacial current density [A.m-2]',

'X-averaged negative electrode total volumetric interfacial current density [A.m-3]',

'X-averaged negative electrode exchange current density [A.m-2]',

'X-averaged negative electrode reaction overpotential [V]',

'X-averaged negative electrode volumetric interfacial current density [A.m-3]',

'X-averaged SEI film overpotential [V]',

'X-averaged positive electrode interfacial current density [A.m-2]',

'X-averaged positive electrode total interfacial current density [A.m-2]',

'X-averaged positive electrode total volumetric interfacial current density [A.m-3]',

'X-averaged positive electrode exchange current density [A.m-2]',

'X-averaged positive electrode reaction overpotential [V]',

'X-averaged positive electrode volumetric interfacial current density [A.m-3]',

'Negative electrode stoichiometry',

'Negative electrode volume-averaged concentration [mol.m-3]',

'Total lithium in primary phase in negative electrode [mol]',

'Positive electrode volume-averaged concentration [mol.m-3]',

'Total lithium in primary phase in positive electrode [mol]',

'X-averaged reaction overpotential [V]',

'X-averaged solid phase ohmic losses [V]',

'Battery open-circuit voltage [V]',

'X-averaged battery reaction overpotential [V]',

'X-averaged battery solid phase ohmic losses [V]',

'X-averaged battery electrolyte ohmic losses [V]',

'X-averaged battery concentration overpotential [V]',

'Battery voltage [V]',

'Change in open-circuit voltage [V]',

'Terminal power [W]',

'Power [W]',

'Resistance [Ohm]',

'Total lithium in negative electrode [mol]',

'LAM_ne [%]',

'Loss of active material in negative electrode [%]',

'Total lithium in positive electrode [mol]',

'LAM_pe [%]',

'Loss of active material in positive electrode [%]',

'LLI [%]',

'Loss of lithium inventory [%]',

'Loss of lithium inventory, including electrolyte [%]',

'Total lithium [mol]',

'Total lithium in particles [mol]',

'Total lithium capacity [A.h]',

'Total lithium capacity in particles [A.h]',

'Total lithium lost [mol]',

'Total lithium lost from particles [mol]',

'Total lithium lost from electrolyte [mol]',

'Total lithium lost to side reactions [mol]',

'Total capacity lost to side reactions [A.h]'

],

to_format="csv")

when I try to use the save_data methods, I get an attribute error message saying that:

[data_short_names["cycle"], i*np.ones_like(cycle.t)]
none-type object has no attribute t.

What is odd however is that this computer uses python 3.11 on a MAC whereas when I try the same code on python 3.8 or 3.9 on windows, it works. Could someone please explain to me why this is happening?