Building a web app on auto parts sales analysis using Streamlit with deployment on StreamShare

Streamlit

It is an open source Python library for creating interactive web
applications quickly and easily.
Ideal for developing dashboards for data visualization,
applications for machine learning models, tools for exploratory
data analysis, and rapid prototyping of web applications.
It allows us to create interactive user interfaces using simple
Python code, without the need to write HTML, CSS or JavaScript.
Widely used in data science, data analysis, machine learning, and web application development.

Streamshare

It is a cloud service that complements Streamlit, allowing to
deploy and share web applications created with Streamlit.
It facilitates the process of putting applications developed
with Streamlit into production, without the need to configure
servers or web infrastructure.
It allows us to upload and host Streamlit applications in the
cloud, generating public URLs to share with other users.
It is useful for sharing analysis results, collaborating on data
science projects, creating web application demos, and
distributing web applications to a wider audience.

1. Installing Streamlit:

To be able to use Streamlit, we will have to install the package through the console (CMD), to do so we execute the following command line: pip install streamlit

2. Creating the web app code :

For the demonstration of the use of Streamlite, a basic web app was developed, about the analysis of auto parts sales, which will show different data visualization graphs:

# Importación de Librerías
import streamlit as st
import pandas as pd
import matplotlib.pyplot as plt

# Datos de productos y ventas
productos = {
    'Articulos': ['Cremalleras', 'Baterías', 'Faros', 'Radiadores'],
    'Stock': [250, 46, 25, 145],
    'Pre. Und': [275.00, 180.00, 90.00, 150.00]
}
productos_df = pd.DataFrame(productos)

ventas = {
    'Mes': ['Enero', 'Febrero', 'Marzo', 'Abril', 'Mayo'],
    'Cremalleras': [7425, 6325, 11550, 5225, 4125],
    'Baterías': [900, 1440, 1260, 2160, 1980],
    'Faros': [720, 270, 450, 270, 360],
    'Radiadores': [3300, 4650, 2700, 3600, 1950]
}
ventas_df = pd.DataFrame(ventas)

# Cálculo de Ingresos, Egresos y Ganancia Neta
precios = {'Cremalleras': 275.00, 'Baterías': 180.00, 'Faros': 90.00, 'Radiadores': 150.00}

ventas_df['Ingresos'] = (ventas_df.drop('Mes', axis=1) * pd.Series(precios)).sum(axis=1)
ingresos_totales = 60660.00

egresos_totales = ingresos_totales * 0.5
ganancia_neta = ingresos_totales - egresos_totales

ventas_df['Egresos'] = ventas_df['Ingresos'] * (egresos_totales / ingresos_totales)

# Configuración de la Página Streamlit
st.set_page_config(page_title="Ventas de Autopartes", layout="wide")

# Título y Subtítulos
st.title("Ventas de Autopartes")
st.subheader("Tabla de Productos y Stock")
st.table(productos_df)

# Tabla de Ventas por Mes
st.subheader("Tabla de Ventas por Mes (en S/)")
st.table(ventas_df.drop(['Ingresos', 'Egresos'], axis=1).applymap
         (lambda x: f"S/ {x:,.2f}" if isinstance(x, (int, float)) else x))

# Ingresos y Egresos por Mes (Gráfico de Barras)
st.subheader("Ingresos y Egresos por Mes (en S/)")
fig, ax = plt.subplots()
ventas_df[['Mes', 'Ingresos', 'Egresos']].plot(kind='bar', x='Mes', ax=ax)
ax.set_xlabel('Mes')
ax.set_ylabel('Monto (S/)')
st.pyplot(fig)

# Distribución de Ingresos por Artículo (Gráfico de Pastel)
st.subheader("Distribución de Ingresos por Artículo (Enero) (en S/)")
fig, ax = plt.subplots()
ax.pie(ventas_df.iloc[0, 1:5], labels=ventas_df.columns[1:5], autopct='%1.1f%%')
ax.axis('equal')
st.pyplot(fig)

# Tendencia de Ventas (Gráfico de Líneas)
st.subheader("Tendencia de Ventas (en S/)")
fig, ax = plt.subplots()
for col in ventas_df.columns[1:5]:
    ax.plot(ventas_df['Mes'], ventas_df[col], marker='o', label=col)
ax.set_xlabel('Mes')
ax.set_ylabel('Monto (S/)')
ax.legend()
st.pyplot(fig)

# Resumen de Ventas (Métricas)
st.subheader("Resumen de Ventas (en S/)")
col1, col2, col3 = st.columns(3)
col1.metric("Ingresos Totales", f"S/ {ingresos_totales:,.2f}")
col2.metric("Egresos Totales", f"S/ {egresos_totales:,.2f}")
col3.metric("Ganancia Neta", f"S/ {ganancia_neta:,.2f}")

We run our program using the following command line: streamlit run (filename)

-After executing the above command, a web page with our graphics
that we have defined in the code of the example exercise will
automatically open locally:

3. Deployment using Streamlit Share :

We enter the Streamlit share page, where we will have 3 options to deploy our web app, in this case we will make use of a previously created repository where we have uploaded our example exercise:

In the repository where we upload the exercise, we must make sure that it is in the main branch. In addition, if necessary, we must add the requirements in a .txt file.

Now, returning to Streamlit Share, we must select the name of our repository, in which branch it is located, the name of the file where we uploaded the code and click on deploy.

We waited a few minutes, and we will see that our deployment of our exercise could be completed.

As we can see, from the Streamlit installation process to deployment using Streamlit Share is done quickly and easily.
Link of the deployed test exercise:
https://app-example-vydyjngb4z5cbzz9ljqufe.streamlit.app/