Metadata-Version: 2.1
Name: EnergySystemModels
Version: 0.1.21.post14
Summary: Energy systems models are the mathematical models that are developed in order to represent as reliably as possible various energy-related problems.
Home-page: UNKNOWN
Author: Zoheir HADID
Author-email: zoheir.hadid@gmail.com
License: UNKNOWN
Project-URL: Documentation, https://energysystemmodels-tutorial.readthedocs.io/en/latest/
Platform: UNKNOWN
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: 3.9
Classifier: Programming Language :: Python :: 3.10
Classifier: License :: OSI Approved :: MIT License
Classifier: Operating System :: OS Independent
Requires-Python: >=3.7
Description-Content-Type: text/markdown
License-File: LICENSE
Requires-Dist: pandas
Requires-Dist: pyfluids
Requires-Dist: pylab-sdk (~=1.3.2)
Requires-Dist: matplotlib
Requires-Dist: tkintertable (~=1.3.3)
Requires-Dist: numpy
Requires-Dist: pyqtgraph
Requires-Dist: thermochem
Requires-Dist: sip
Requires-Dist: PyQt-builder
Requires-Dist: PyQt5
Requires-Dist: scikit-learn
Requires-Dist: beautifulsoup4
Requires-Dist: tqdm
Requires-Dist: statsmodels
Requires-Dist: python-docx
Requires-Dist: pvlib
Requires-Dist: gekko

# EnergySystemModels Documentation

- [Documentation :](https://energysystemmodels-tutorial.readthedocs.io/en/latest/)


<!-- - [1. Thermodynamic Cycles Package](#1-thermodynamic-cycles-package)
  * [1.1. Fluid Source](#11-fluid-source)
    + [1.1.1. Input parameters](#111-Input-parameters)
  * [1.2. Sink](#12-sink)
  * [1.3. Compressor](#13-compressor)
    + [1.3.1. Compressor model](#131-compressor-model)
  * [1.4. Water Heat Storage](#14-water-heat-storage)
    + [1.4.1. Mixed Tank](#141-mixed-tank)

- [2. AHU modules](#2-ahu-modules)
  * [2.1 Fresh AHU Example](#21-fresh-ahu-exemple)
- [3. Chiller Example](#3-Chiller-Example)
  * [3.1. Launch Chiller Application (Tkinter GUI)](#31-Launch-Chiller-Application-(Tkinter-GUI))
  * [3.2. Create Oriented-Object Chiller](#32-Create-Oriented-Object-Chiller)

- [4. DonnÃ©es mÃ©tÃ©o](#4-DonnÃ©es-mÃ©tÃ©o)
  * [4.1. OpenWeaterMap](#41-OpenWeaterMap)
  * [4.2. MeteoCiel](#42-MeteoCiel)
- [5. IPMVP](#5-IPMVP)
- [6. Production solaire] (#6-production-solaire)

# 1. Thermodynamic Cycles Package
## 1.1. Fluid Source
### 1.1.1. Input parameters

| Symbol   |      Description      |  SI Units | Used Units |
|----------|:-------------:|------:|------:|
| Ti_degC |  Inlet temerature | K | Â°C |
| fluid |  Fluid/Refrigerant name    |  String |"air","ammonia","R134a",...|
| F, F_Sm3s, F_m3s, F_Sm3h, F_m3h, F_kgh | Input Flow rate |   kg/s | kg/s, Sm3/s, m3/s, Sm3/h, m3/h, kg/h |
| Pi_bar | Inlet Pressure |   Pa | bara |

``` python
from ThermodynamicCycles.Source import Source

#Create Compressor Object
SOURCE=Source.Object()

#Data Input
SOURCE.Pi_bar=1.01325
SOURCE.fluid="air"
SOURCE.F=1
#SOURCE.F_Sm3s=2937.482966/3600 #SOURCE.F_m3s=2480.143675/3600
#SOURCE.F_Sm3h=1 #SOURCE.F_m3h=2480.143675 #SOURCE.F_kgh=3600

#Calculate Object
SOURCE.calculate()

#Data output
print(SOURCE.df)
```
## 1.2. Sink

### 1.2.1. Test Sink
``` python
from ThermodynamicCycles.Sink import Sink
#from ThermodynamicCycles.Connect import Fluid_connect

#Create Sink object
SINK=Sink.Object()

#Fluid_connect(SINK.Inlet,SOURCE.Outlet) 
SINK.Inlet.fluid="air"
SINK.Inlet.F=0.334
SINK.Inlet.P=101325
SINK.Inlet.h=420000

#calculate SINK
SINK.calculate()

#Print result

print(SINK.df)
print(SINK.To_degC)
```
### Output data

## 1.3. Compressor
### 1.3.1. Compressor model

```python

from ThermodynamicCycles.Source import Source
from ThermodynamicCycles.Compressor import Compressor
from ThermodynamicCycles.Sink import Sink
from ThermodynamicCycles.Connect import Fluid_connect

#Create Compressor Object with Source and fluid Sink
SOURCE=Source.Object()
COMP=Compressor.Object()
SINK=Sink.Object()

#Data Input
SOURCE.Ti_degC=20
SOURCE.fluid="air"
SOURCE.Pi_bar=1
SOURCE.F_Sm3h=500 # is not considered if  COMP.Q_comp is not None

COMP.eta_is=0.80
COMP.Tdischarge_target=80 # (discharge temperature in degC, after cooler)
COMP.HP=7.5*100000 # discharge pressure in Pa
COMP.Q_comp=48745.761 # if Energy Power is given (W) the Mass flow rate is recalculated


#Calculate and Connect Objects
SOURCE.calculate()
Fluid_connect(COMP.Inlet,SOURCE.Outlet)
COMP.calculate()
Fluid_connect(SINK.Inlet,COMP.Outlet)
SINK.calculate()

#Data output (print DataFrame)
print(SOURCE.df)
print(COMP.df)
print(SINK.df)

```


<img src="https://render.githubusercontent.com/render/math?math=\eta_{is} = 0.8">
# EnergySystemModels
Energy System Models for Energy Efficiency Calculation

## 1.4. Water Heat Storage
### 1.4.1. Mixed Tank
```python
from ThermodynamicCycles import MixedStorage
from ThermodynamicCycles.Source import Source
from ThermodynamicCycles.Sink import Sink
from ThermodynamicCycles.Connect import Fluid_connect


#lecture d'un fichier excel
#pip install pandas
import pandas as pd
import os
data=pd.read_excel( os.path.join(os.path.dirname(__file__), 'HotWaterStorage.xlsx'))
data['Timestamp'] = pd.to_datetime(data['Timestamp'], unit="%d/%m/%y %H:%M:%S")
rows = data.shape[0]
print(rows)
print(data.columns)

#initialiser les table de Outlet
df_result=pd.DataFrame(data=None, index=None, columns=None, dtype=None, copy=False)
df_source=pd.DataFrame(data=None, index=None, columns=None, dtype=None, copy=False)
df_str=pd.DataFrame(data=None, index=None, columns=None, dtype=None, copy=False)
df_sink=pd.DataFrame(data=None, index=None, columns=None, dtype=None, copy=False)

#CreateTank Object with Source and fluid Sink
SOURCE=Source.Object()
SINK=Sink.Object()
STR=MixedStorage.Object()

#paramÃ¨tres
STR.V=4
STR.Tinit_degC=40
STR.t=1*3600 #in seconde

for r in range(1, rows):
#Data Input
    SOURCE.Ti_degC=data["TdegC"][r] 
    SOURCE.fluid="water"
    SOURCE.Pi_bar=1
    SOURCE.F_m3h=data["F_m3h"][r] 

    SOURCE.Timestamp=data["Timestamp"][r]
    STR.Timestamp=data["Timestamp"][r]
    SINK.Timestamp=data["Timestamp"][r]

    #calcul du pas de temps
    Timestamp=data["Timestamp"][r] 
    dt=(data["Timestamp"][r]-data["Timestamp"][r-1]).total_seconds()
    #print(dt)
    STR.t=dt

    SOURCE.calculate()
    Fluid_connect(STR.Inlet,SOURCE.Outlet)
    STR.calculate()
    Fluid_connect(SINK.Inlet,STR.Outlet)
    SINK.calculate()

    df_str=df_str.append(STR.df.T)
    df_source=df_source.append(SOURCE.df.T)
    df_sink=df_sink.append(SINK.df.T)
  
# Add new column to the DataFrame
df_result=df_str.merge(df_sink, on=['Timestamp']).merge(df_source, on=['Timestamp'])
print(df_result)

with pd.ExcelWriter('output_WaterStorage.xlsx') as writer:                #CrÃ©ation d'un fichier de Outlet + Ecriture
    df_result.to_excel(writer, sheet_name='Feuille output',index=False)
    data.to_excel(writer, sheet_name='Feuille input',index=False)

####PLOT#####

# Import Library

import matplotlib.pyplot as plt
df_result.index=df_result['Timestamp']

# to set the plot size
plt.figure(figsize=(16, 8), dpi=100)

# Plot
df_result["str_Ti_degC"].plot(marker="o",label='TentrÃ¨e (Â°C)', color='orange')
df_result["str_T_degC"].plot(marker="o",label='Tsortie (Â°C)')
df_result["cumul_Qstr_kWh"].plot(marker="o",label='Energie stockÃ©e cumulÃ©e (kWh)')
df_result["Qstr_kW"].plot(marker="o",label='Puissance de stockage (kW)')

# Labelling 

plt.xlabel("Date")
plt.ylabel("kWh, kW et Â°C")
plt.legend()
plt.grid()
plt.title("Stockage d'Ã©nergie thermique")

# Display

plt.show()
```

# 2. AHU modules
# 2.1 Fresh AHU Example

``` python

# =============================================================================
# AHU Model (Fresh air + Heating Coil + humidifier)
# =============================================================================

#module de calcul des prop d'air humide
from AHU import FreshAir
#Heating Coil Component
from AHU import HeatingCoil
#composant Humidifier (vapeur ou adiabatique)
from AHU.Humidification import Humidifier
# connexion entre les composants
from AHU.Connect import Air_connect

##########CrÃ©ation des Objects
AN=FreshAir.Object()
BC=HeatingCoil.Object()
HMD=Humidifier.Object()

    
#RÃ©cupÃ©ration des donnÃ©es entrÃ©es par l'utilisateur
        #AN
AN.F_m3h=3000 #m3/h
#print("AN.F_m3h = ",AN.F_m3h)
AN.T=14 #Â°C
AN.RH_FreshAir=71 # %
    #BC
BC.To_target=15 #Â°C
    #Humidifier
HMD.wo_target=8 #g/Kg dry air

    #calculate les propriÃ©tÃ©s d'air neuf; !important
AN.calculate()

Air_connect(BC.Inlet,AN.Outlet)
BC.calculate()
    

Air_connect(HMD.Inlet,BC.Outlet)
    
HMD.HumidType="vapeur" #par default : Humdificateur adiabatique
HMD.calculate()


#enregistrer les rÃ©sultats du module d'air neuf

#Absolute Humidity  g/kg_as

print("Fresh Air Absolute Humidity  g/kg_as",round(AN.w,1))
# print("HA_FreshAir[r-1] = ",HA_FreshAir[r-1])
#Sat Vapor Pressure  " Pa"

print("Fresh Air Sat Vapor Pressure   Pa",round(AN.Pvsat,0))
#Wet-Bulb Temperature  Â°C

print("Fresh Air Wet-Bulb Temperature  Â°C",round(AN.T_hum,1))
#Specific Enthalpy  KJ/Kg_as

print("Fresh Air Specific Enthalpy  KJ/Kg_as",round(AN.h,3))

#enregistrer les rÃ©sultats de la Coil de prÃ©chauffage

# Specific Enthalpy KJ/Kg_as
print("Heating Coil Specific Enthalpy KJ/Kg_as",round(BC.ho,1))
# Thermal Power  kW"
print("Heating Coil Thermal Power  kW",round(BC.Qth,1))
# Relative Humidity %"
print("Heating Coil Relative Humidity %",round(BC.RH_out,1))
    
print("Humidifier Steam mass flow rate Kg/s",round(HMD.F_water,3))  
print("Humidifier Dry air mass flow rate Kg/s",round(HMD.F_dry,3)) 

# =============================================================================
# End AHU Model
# =============================================================================

```

# 3. Chiller Example

## 3.1. Launch Chiller Application (Tkinter GUI)
``` python
from TkinterGUI import Chiller
``` 
## 3.2. Create Oriented-Object Chiller

``` python
# =============================================================================
# Chiller Model (Evaporator + Compressor + Desuperheater + Condenser + Expansion_Valve)
# =============================================================================

# #ThermodynamicCycles
import CoolProp.CoolProp as CP
from ThermodynamicCycles.Evaporator import Evaporator
from ThermodynamicCycles.Compressor import Compressor
from ThermodynamicCycles.Desuperheater import Desuperheater
from ThermodynamicCycles.Expansion_Valve import Expansion_Valve
from ThermodynamicCycles.Condenser import Condenser
from ThermodynamicCycles.Connect import Fluid_connect

###############Create chiller component object ##################
EVAP=Evaporator.Object()
COMP=Compressor.Object()
DESURCH=Desuperheater.Object()
COND=Condenser.Object()
DET=Expansion_Valve.Object()
###############################################################

########################Cycle Inlet Parameters########################
#***************Evaporator parameters*******
fluid="R134a"
EVAP.fluid=fluid
EVAP.Inlet.F=1 #Kg/s
# T or P evap :
EVAP.LP_bar=2.930154 #bar
#EVAP.Ti_degC=0 #Tevap 
EVAP.surchauff=2 #superheating
EVAP.Inlet.h= CP.PropsSI('H','P',1*1e5,'T',40+273.15,fluid)   #initialisation pour le calcul en boucle
#******************compresseur parameters***********

# give HP or Tcond
#COMP.HP=1e5*10 #Pa
COMP.Tcond_degC=40
COMP.eta_is=0.8 # isentropic efficiency
COMP.Tdischarge_target=80 #Â°C compressor outlet temperature, neglected if compressor is not cooled
COMP.Q_comp==100000 #in (W) If this value is given, the mass flow rate is calculated /Write None if not used  #in (W) If this value is given, the mass flow rate is calculated
#*************** Condenser parameters**************
COND.subcooling=2 #Â°C subcooling


#calculation algorithme
EVAP.calculate() # evaporator initialisation
Fluid_connect(COMP.Inlet,EVAP.Outlet)
COMP.calculate()
Fluid_connect(DESURCH.Inlet,COMP.Outlet)
DESURCH.calculate()
Fluid_connect(COND.Inlet, DESURCH.Outlet)
COND.calculate()
Fluid_connect(DET.Inlet,COND.Outlet)
Fluid_connect(DET.Outlet,EVAP.Inlet)
DET.calculate()
Fluid_connect(EVAP.Inlet,DET.Outlet)
EVAP.calculate() # recalculate evaporator

# Cycle performance
EER=EVAP.Q_evap/COMP.Q_comp
print("EER="+str(round(EER,1))+" ")
Q_condTot=COND.Q_cond+DESURCH.Qdesurch
print("Q_condTot="+str(round(Q_condTot/1000,1))+" kW")
COP=Q_condTot/COMP.Q_comp
print("COP="+str(round(COP,1))+" ")

# ####### Print Results#######################"
print(COMP.df)
print(EVAP.df)
print(DESURCH.df)
print(COND.df)
print(DET.df)

# =============================================================================
# End Chiller Model
# =============================================================================
```

## 3.3. Hydraulique

``` python
from ThermodynamicCycles.Hydraulic import StraightPipe
from ThermodynamicCycles.Source import Source
from ThermodynamicCycles.Sink import Sink
from ThermodynamicCycles.Connect import Fluid_connect

SOURCE=Source.Object()
STRAINGHT_PIPE=StraightPipe.Object()
STRAINGHT_PIPE2=StraightPipe.Object()
SINK=Sink.Object()

SOURCE.fluid="water"
SOURCE.Ti_degC=25
SOURCE.Pi_bar=1
SOURCE.F_m3h=100
SOURCE.calculate()
STRAINGHT_PIPE.d_hyd=0.050
STRAINGHT_PIPE.L=100
STRAINGHT_PIPE.K=0.00002

STRAINGHT_PIPE2.d_hyd=0.2
STRAINGHT_PIPE2.L=100
STRAINGHT_PIPE2.K=0.00002

Fluid_connect(STRAINGHT_PIPE.Inlet,SOURCE.Outlet)
STRAINGHT_PIPE.calculate()
Fluid_connect(STRAINGHT_PIPE2.Inlet,STRAINGHT_PIPE.Outlet)
STRAINGHT_PIPE2.calculate()
Fluid_connect(SINK.Inlet,STRAINGHT_PIPE2.Outlet)
SINK.calculate()

print(SOURCE.df)
print(STRAINGHT_PIPE.df)
print(STRAINGHT_PIPE2.df)
print(SINK.df)


```

# 3. Pinch Analysis 

``` python

from PinchAnalysis.PinchCalculation import PinchCalculation
import pandas as pd
import matplotlib.pyplot as plt

#DataFrame Input Data
df=pd.DataFrame({'id': [1, 2, 3, 4],
                   'name': ['stream1', 'stream2', 'stream3', 'stream4'],
                   'Ti': [200, 50, 125, 45],
                 'To': [50, 250, 124, 195],
                 'mCp': [3, 2,300,4],
                 'dTmin2': [5, 5, 10, 10],
                 'integration': [True, True, True, True]
                 })


#Pinch Calculation
T, plot_GCC, plot_ccf,plot_ccc,utilite_froide,utilite_chaude=PinchCalculation(df)

#Print the results
print("T",T)
print("GCC",plot_GCC[:,0])
print("ccf",plot_ccf[:,0])
print("ccc",plot_ccc[:,0])
print("utilite_froide",utilite_froide)
print("uilite_chaude",utilite_chaude)


# Plot the results

fig, (ax1, ax2) = plt.subplots(1, 2)
ax1.plot(plot_ccf[:,0],T, color='tab:blue')
ax1.plot(plot_ccc[:,0],T, color='tab:red')
ax2.plot(plot_GCC[:,0],T, color='tab:orange')
ax1.set(xlabel='kW', ylabel='Temperature (Â°C)')
ax2.set(xlabel='kW')
ax1.grid(True)
ax2.grid(True)
plt.show()

```

# 4 DonnÃ©es-mÃ©tÃ©o
## 4.1 OpenWeaterMap
Pour lire la tempÃ©rature et l'humiditÃ© en fonction d'une position GPS Ã  partir des donnÃ©es de OpenWeaterMap 
``` python
from OpenWeatherMap import OpenWeatherMap_call_location

df=OpenWeatherMap_call_location.API_call_location("48.862725","2.287592")

print(df)
```

<Response [200]>
                   Timestamp  T(Â°C)  RH(%)
0 2023-03-09 14:09:01.941527  14.39     72

## 4.2 MeteoCiel

Scraper les donnÃ©es historique d'une station Meteociel
``` python
from datetime import datetime
#pip install energysystemmodels
from MeteoCiel.MeteoCiel_Scraping import MeteoCiel_histoScraping

# 0. DonnÃ©es d'entrÃ©e#
code2=10637 #station mÃ©tÃ©o
date_debut=datetime(2023,1,1)
date_fin=datetime.now()

print("date_debut:",date_debut)
print("date_fin:",date_fin)

# 1. Utiliser la fonction de scraping
df_histo,df_day, df_month, df_year=MeteoCiel_histoScraping(code2,date_debut,date_fin,base_chauffage=18, base_refroidissement=23)
# la base de calcul DJU par default = base_chauffage=18, base_refroidissement=23

# 2. Entregistrer sous forme d'un fichier Excel
df_histo.to_excel("Meteociel.fr_station_"+str(date_debut.date())+"_to_"+str(date_fin.date())+".xlsx")
df_day.to_excel("day_Meteociel.fr_station_"+str(date_debut.date())+"_to_"+str(date_fin.date())+".xlsx")
df_month.to_excel("month_Meteociel.fr_station_"+str(date_debut.date())+"_to_"+str(date_fin.date())+".xlsx")
df_year.to_excel("year_Meteociel.fr_station_"+str(date_debut.date())+"_to_"+str(date_fin.date())+".xlsx")

```


# 5-IPMVP
``` python
#pip install energysystemmodels
from IPMVP.IPMVP import Mathematical_Models
import os 
from datetime import datetime
import pandas as pd

# Nom du fichier de donnÃ©es
filename="Input-Data.xlsx"
# Nom de la colonne de Date
date="Timestamp"

#lecture des donnÃ©es
directory = os.getcwd()
file_directory=directory+"\\"+filename
df=pd.read_excel(file_directory)

#Transformer la date en index de date horaire. 
df[date] = pd.to_datetime(df[date])
df = df.set_index(df[date])

# dÃ©finition des pÃ©riodes de rÃ©fÃ©rence et de suivi
start_baseline_period=datetime(2018,1,1,hour=0)
end_baseline_period=datetime(2021,12,31,hour=0)
start_reporting_period=datetime(2022,1,1,hour=0)
end_reporting_period=datetime(2023,3,1,hour=0)

# ModÃ¨le IPMVP (Maille journaliÃ¨re)
df = df.resample('D').sum()
X=df[["x1","x2","x3","x4","x5","x6"]] #variables explicatives candidates
y=df["y"] # consommation d'Ã©nergie
day_model=Mathematical_Models(y,X,start_baseline_period,end_baseline_period,start_reporting_period,end_reporting_period,degree=3,print_report=True,seuil_z_scores=3)

# ModÃ¨le IPMVP Maille hÃ©bdo
weekly_X = X.resample('W').sum()
weekly_y =y.resample('W').sum()
day_model=Mathematical_Models(weekly_y,weekly_X,start_baseline_period,end_baseline_period,start_reporting_period,end_reporting_period)

# ModÃ¨le IPMVP Maille Mensuelle
monthly_X = X.resample('M').sum()
monthly_y =y.resample('M').sum()
month_model=Mathematical_Models(monthly_y,monthly_X,start_baseline_period,end_baseline_period,start_reporting_period,end_reporting_period)

# ModÃ¨le IPMVP Maille annuelle
# yearly_X = X.resample('Y').sum()
# yearly_y =y.resample('Y').sum()
# year_model=Mathematical_Models(yearly_y,yearly_X,start_baseline_period,end_baseline_period,start_reporting_period,end_reporting_period)
```
# 6-Production solaire
``` python
from PV.ProductionElectriquePV import SolarSystem

# Exemple d'utilisation de la classe SolarSystem
system = SolarSystem(48.8566, 2.3522, 'Paris', 34, 'Etc/GMT-1', 180.0, 48.9)
system.retrieve_module_inverter_data()
system.retrieve_weather_data()
system.calculate_solar_parameters()
system.plot_annual_energy()

``` 

# 7-Calcul du TURPE

``` python

from Facture.TURPE import input_Contrat, TurpeCalculator, input_Facture,input_Tarif

facture = input_Facture(start="2022-09-01", end="2022-09-30", heures_depassement=0, depassement_PS_HPB=64, kWh_pointe=0, kWh_HPH=0, kWh_HCH=0, kWh_HPB=26635, kWh_HCB=12846)
#contrat = input_Contrat(domaine_tension="HTA", PS_pointe=129, PS_HPH=129, PS_HCH=129, PS_HPB=129, PS_HCB=250, version_utilisation="LU_pf")
contrat = input_Contrat(domaine_tension="BT > 36 kVA", PS_pointe=129, PS_HPH=129, PS_HCH=129, PS_HPB=129, PS_HCB=250, version_utilisation="LU",pourcentage_ENR =100)
tarif = input_Tarif(
    c_euro_kWh_pointe=0.2,
    c_euro_kWh_HPB=0.15,
    c_euro_kWh_HCB=0.12,
    c_euro_kWh_HPH=0.18,
    c_euro_kWh_HCH=0.16,
    c_euro_kWh_TCFE=0.05,
    c_euro_kWh_certif_capacite=0.03,
    c_euro_kWh_ENR=0.1,
    c_euro_kWh_ARENH=0.09
)
# Utilisez les valeurs du contrat et de la facture pour crÃ©er une instance de TurpeCalculator
turpe_calculator = TurpeCalculator(contrat,tarif, facture)

# Calculez le TURPE et les Taxes en utilisant les valeurs de la facture et du contrat
turpe_calculator.calculate_turpe()
#turpe_calculator.calculate_taxes_contrib()

# Imprimez les rÃ©sultats de la TURPE
print(f"Acheminement (â‚¬) : {turpe_calculator.euro_TURPE}")
print(f"Taxes et Contributions (â‚¬) : {turpe_calculator.euro_taxes_contrib}")

```  -->

Documentation: https://energysystemmodels-tutorial.readthedocs.io

