Code Editor for app.py

import streamlit as st
import pandas as pd
import numpy as np
import altair as alt

@st.cache_data
def load_data(url):
    return pd.read_csv(url)

# Default URL
url = st.text_input("Enter CSV URL:","https://raw.githubusercontent.com/mwaskom/seaborn-data/master/penguins.csv")

# Load data from CSV
try:
    df = load_data(url)
except Exception as e:
    st.error(f"Error loading data: {e}")
    st.stop()

# Display DataFrame
st.write("## DataFrame", df)

# Control how many rows to display
num_rows = st.slider("Number of rows to display:", 1, df.shape[0], value=5)
st.write(df.head(num_rows))

# Checkbox to shuffle DataFrame
shuffle = st.checkbox("Shuffle DataFrame")
if shuffle:
    df = df.sample(frac=1).reset_index(drop=True)

# Select variables for visualization
variables = df.columns.tolist()
variable1 = st.selectbox("Select first variable:", variables)
variable2 = st.selectbox("Select second variable:", variables)

# Visualize based on selection
if variable1 and variable2:
    chart_data = df[[variable1, variable2]].dropna()
    if chart_data.shape[1] == 1:
        chart = alt.Chart(chart_data).mark_bar().encode(x=variable1, y='count()').properties(width=600, height=400)
    else:
        chart = alt.Chart(chart_data).mark_circle(size=60).encode(x=variable1, y=variable2, tooltip=[variable1, variable2]).properties(width=600, height=400)
    st.altair_chart(chart)