import streamlit as st name = st.text_input("What is your name?") if name: st.write(f"Hello, {name}! 👋")

import streamlit as st st.title("My First App") st.write("Hello! This is my first Streamlit app.")

import streamlit as st import random st.title("🎲 Dice Roller") if st.button("Roll Dice"): number = random.randint(1, 6) st.write(f"You rolled: {number}!") if number == 6: st.balloons() st.write("🎉 Yay! You got a six!")

import streamlit as st # Show a big title st.title("My First Streamlit App") # Show normal text st.write("This is a simple text message.") # Show bold and italic text st.write("This is **bold** and *italic*.") # Show a code block code = ''' import pandas as pd df = pd.read_csv("data.csv") print(df.head()) ''' st.code(code, language="python") # Show a dictionary user = {"name": "Alice", "age": 25, "city": "Dhaka"} st.write(user)

import streamlit as st import pandas as pd import numpy as np # Create fake data df = pd.DataFrame({ "Name": ["Alice", "Bob", "Charlie", "Diana"], "Age": [24, 30, 28, 35], "City": ["Dhaka", "Delhi", "London", "NYC"] }) # Show as scrollable table st.dataframe(df) # Show as static table st.table(df) # Show a metric (like a KPI) st.metric("Total Users", value=4, delta="+1 new") # Show dictionary as JSON data = {"project": "Streamlit Course", "students": 100, "status": "active"} st.json(data, expanded=False)

import streamlit as st import pandas as pd import numpy as np # Create sample data chart_data = pd.DataFrame( np.random.randn(20, 3), columns=['A', 'B', 'C'] ) # Line chart st.subheader("Line Chart") st.line_chart(chart_data) # Bar chart st.subheader("Bar Chart") st.bar_chart(chart_data) # Map st.subheader("Map of Cities") places = pd.DataFrame({ "lat": [19.0760, 28.6139, 40.7128], # Mumbai, Delhi, NYC "lon": [72.8777, 77.2090, -74.0060] }) st.map(places)

import streamlit as st # Button if st.button("Click Me"): st.write("Button was clicked!") # Checkbox agree = st.checkbox("I agree to the terms") if agree: st.write("Thank you for agreeing!") # Radio button food = st.radio( "What would you like to eat?", ("Pizza", "Burger", "Salad") ) st.write(f"You selected: {food}") # Dropdown (selectbox) city = st.selectbox( "Where do you live?", ["Dhaka", "Delhi", "London", "Tokyo"] ) st.write(f"Your city: {city}")

import streamlit as st # Slider age = st.slider("Your Age", 0, 100, 25) st.write(f"You are {age} years old.") # Text input name = st.text_input("Your Name", placeholder="Type your name") if name: st.write(f"Hello, {name}!") # Number input weight = st.number_input("Your Weight (kg)", min_value=30, max_value=200, value=60) st.write(f"Your weight: {weight} kg") # Multiselect hobbies = st.multiselect( "Your Hobbies", ["Music", "Sports", "Reading", "Cooking"], default=["Music"] ) st.write("You enjoy:", hobbies)

import streamlit as st # File uploader uploaded_file = st.file_uploader("Upload a text file", type=["txt"]) if uploaded_file: content = uploaded_file.read().decode("utf-8") st.write("File content:") st.text(content) # Camera input camera_photo = st.camera_input("Take a photo") if camera_photo: st.image(camera_photo, caption="Your photo")

import streamlit as st # Show image st.image("doggo.jpg", caption="A cute dog", width=400) # Play audio st.audio("audio.mp3", format="audio/mp3") # Play video st.video("video.mp4", format="video/mp4")

import streamlit as st # Sidebar with st.sidebar: st.header("Menu") choice = st.radio("Go to", ["Home", "Settings"]) # Columns col1, col2 = st.columns(2) col1.write("This is left column") col2.write("This is right column") # Tabs tab1, tab2 = st.tabs(["Info", "Data"]) tab1.write("Welcome to the Info tab!") tab2.write("Here is some data: 1, 2, 3, 4, 5") # Expander with st.expander("Click to see more"): st.write("This was hidden!")

import streamlit as st import time # Progress bar st.subheader("Progress Bar") progress = st.progress(0) for i in range(100): time.sleep(0.05) progress.progress(i + 1) # Spinner with st.spinner("Loading..."): time.sleep(3) st.success("Done!") # Fun effects st.balloons() st.snow()

import streamlit as st # Form to collect user info with st.form("user_form"): name = st.text_input("Your Name") age = st.slider("Your Age", 18, 100, 25) email = st.text_input("Email Address") # This button submits the form submitted = st.form_submit_button("Submit") # Show result after submit if submitted: st.success(f"Thanks, {name}! We’ll send info to {email}.") st.write(f"Age: {age}") # Show some code nicely st.subheader("Code Example") with st.echo(): def greet(user): return f"Hello, {user}!" msg = greet("Alice") st.write(msg)

import streamlit as st import pandas as pd import numpy as np import time # Initial data df = pd.DataFrame( np.random.randn(10, 2), columns=["Stock Price", "Volume"] ) # Show initial chart st.subheader("Live Stock Chart") chart = st.line_chart(df) # Add new data every second st.write("Updating chart...") for i in range(5): time.sleep(1) # Wait 1 second new_row = pd.DataFrame( np.random.randn(1, 2), columns=["Stock Price", "Volume"] ) chart.add_rows(new_row) # Add new point to chart st.balloons() st.write("Chart update complete!")

import streamlit as st # Initialize counter if not exists if "counter" not in st.session_state: st.session_state.counter = 0 # Show current count st.write(f"Counter: {st.session_state.counter}") # Buttons to change counter if st.button("Add 1"): st.session_state.counter += 1 if st.button("Reset"): st.session_state.counter = 0 # Bonus: Use widget with key name = st.text_input("Save your name", key="user_name") if st.session_state.user_name: st.write(f"Hello again, {st.session_state.user_name}!")

import streamlit as st import time import pandas as pd import numpy as np # ❌ Slow function (without cache) def slow_function(): st.write("⏳ Loading data... (This takes time!)") time.sleep(3) return pd.DataFrame(np.random.randn(10, 2), columns=["A", "B"]) # ✅ Fast function (with cache) @st.cache_data def cached_function(): st.write("📦 Caching data...") time.sleep(3) return pd.DataFrame(np.random.randn(10, 2), columns=["A", "B"]) st.subheader("Without Cache") if st.button("Run Slow Function"): result = slow_function() st.dataframe(result) st.subheader("With Cache") if st.button("Run Cached Function"): result = cached_function() st.dataframe(result)

import streamlit as st st.title("🧮 BMI Calculator") # Input height = st.slider("Height (cm)", 100, 250, 170) weight = st.slider("Weight (kg)", 30, 200, 70) # Calculate bmi = weight / ((height / 100) ** 2) # Show result st.subheader(f"Your BMI: {bmi:.2f}") # Give feedback if bmi < 18.5: st.warning("Underweight") elif bmi < 25: st.success("Normal weight") elif bmi < 30: st.warning("Overweight") else: st.error("Obese")

import streamlit as st import pandas as pd st.title("📂 CSV Data Viewer") # Upload CSV file uploaded = st.file_uploader("Upload your CSV file", type=["csv"]) if uploaded: # Read the file df = pd.read_csv(uploaded) # Show data st.subheader("Data Preview") st.dataframe(df.head(10)) # Show first 10 rows # Show basic info st.subheader("Basic Info") st.write(f"Total Rows: {df.shape[0]}") st.write(f"Total Columns: {df.shape[1]}") st.write("Column Names:", list(df.columns)) # Show data types st.subheader("Data Types") st.write(df.dtypes) # Show chart (if numeric columns exist) numeric_cols = df.select_dtypes(include=['number']).columns if len(numeric_cols) > 0: st.subheader("Chart of First Numeric Column") st.line_chart(df[numeric_cols[0]].head(20)) else: st.info("No numeric data to chart.")

import streamlit as st st.title("📝 Simple To-Do List") # Initialize session state for tasks if "tasks" not in st.session_state: st.session_state.tasks = [] # Input to add new task new_task = st.text_input("Add a new task:") if st.button("Add Task") and new_task: st.session_state.tasks.append(new_task) st.success(f"Task added: {new_task}") # Show all tasks if st.session_state.tasks: st.subheader("Your Tasks") for i, task in enumerate(st.session_state.tasks): st.write(f"{i+1}. {task}") else: st.info("No tasks yet. Add one above!") # Clear all tasks if st.button("Clear All Tasks"): st.session_state.tasks = [] st.warning("All tasks cleared!")

import streamlit as st st.title("🧠 Simple Quiz App") # Questions and answers questions = [ { "q": "Is Python a programming language?", "options": ["Yes", "No"], "correct": "Yes" }, { "q": "Does Streamlit need HTML?", "options": ["Yes", "No"], "correct": "No" }, { "q": "Can you deploy Streamlit for free?", "options": ["Yes", "No"], "correct": "Yes" } ] # Start quiz st.write("Answer the questions below:") score = 0 for i, qa in enumerate(questions): st.subheader(f"Question {i+1}: {qa['q']}") answer = st.radio(f"Choose:", qa["options"], key=f"q{i}") if answer == qa["correct"]: score += 1 # Show result if st.button("Submit Quiz"): st.subheader(f"Your Score: {score} / {len(questions)}") if score == len(questions): st.balloons() st.success("🎉 Perfect! You're a Streamlit pro!") elif score >= 2: st.success("Good job! Keep learning.") else: st.warning("Keep practicing. You'll get better!")

import streamlit as st st.title("🌡️ Temperature Converter") # Choose conversion type conversion = st.selectbox( "Convert from:", ["Celsius to Fahrenheit", "Fahrenheit to Celsius"] ) # Input temperature temp = st.number_input("Enter temperature:", value=0.0) # Convert if conversion == "Celsius to Fahrenheit": result = (temp * 9/5) + 32 st.write(f"**{temp}°C = {result:.1f}°F**") else: result = (temp - 32) * 5/9 st.write(f"**{temp}°F = {result:.1f}°C**") # Add a fun message if temp > 100: st.warning("That's boiling hot!") elif temp < 0: st.info("Below freezing!")

import streamlit as st st.title("📬 Feedback Form") with st.form("feedback_form"): name = st.text_input("Your Name") rating = st.slider("Rate us (1-5)", 1, 5, 3) comments = st.text_area("Your Comments") submitted = st.form_submit_button("Submit") if submitted: st.success("Thank you for your feedback!") st.write(f"**Name:** {name}") st.write(f"**Rating:** {rating} ⭐") st.write(f"**Comments:** {comments}")

import streamlit as st # Page config st.set_page_config( page_title="My Portfolio", page_icon="👨‍💻", layout="centered" ) # Title & Profile st.title("👨‍💻 My Portfolio") st.subheader("Hi, I'm Alice!") st.write("A passionate learner and future developer.") # Profile Image st.image("profile.jpg", width=200, caption="That's me!") # Info Section st.write("---") # Line divider st.subheader("About Me") st.write(""" I am a student from Bangladesh.  I love coding, data science, and building small apps.  Currently learning Streamlit to create interactive projects. """) # Skills st.subheader("Skills") skills = ["Python", "Streamlit", "Pandas", "Data Analysis", "Basic ML"] for skill in skills: st.markdown(f"- {skill}") # Projects st.write("---") st.subheader("Projects") projects = [ {"name": "CSV Viewer", "desc": "Upload and view CSV files"}, {"name": "To-Do List", "desc": "Simple task manager with session state"}, {"name": "Quiz App", "desc": "Interactive quiz with scoring"} ] for proj in projects: st.write(f"**{proj['name']}**: {proj['desc']}") # Contact Form st.write("---") st.subheader("Contact Me") with st.form("contact_form"): name = st.text_input("Your Name") email = st.text_input("Your Email") message = st.text_area("Your Message") submitted = st.form_submit_button("Send Message") if submitted: st.success("Thank you! I'll get back to you soon.") # In real app, you'd send email (advanced) st.write(f"Name: {name}") st.write(f"Email: {email}") st.write(f"Message: {message}") # Footer st.write("---") st.write("🔗 Find me on: [GitHub](https://github.com/yourusername) | [LinkedIn](https://linkedin.com/in/yourprofile)") st.write("📧 Email: you@example.com") st.write("Built with ❤️ using Streamlit")

st.subheader("Hi, I'm Alice!")

st.subheader("Hi, I'm [Your Name]!")

st.image("my_photo.jpg", width=200, caption="Me")

st.write("---") st.subheader("Education") st.write(""" - BSc in Computer Science – XYZ University (2024) - High School – ABC School (2020) """)

st.write("🔗 Find me on: [GitHub](https://github.com/yourname) | [Twitter](https://twitter.com/yourhandle)")

# Download Resume with open("resume.pdf", "rb") as f: st.download_button( label="📄 Download My Resume", data=f, file_name="my_resume.pdf", mime="application/pdf" )

import streamlit as st

st.write("Hello") # ❌ No import!

import streamlit as st # ✅ Add this! st.write("Hello")

import streamlit as st

st.image("images/profile.jpg") # if inside images/ folder

clicked = st.button("Click me") if clicked: st.write("Button was clicked!") # But it resets when you type in a text box

import streamlit as st if "clicked" not in st.session_state: st.session_state.clicked = False if st.button("Click me"): st.session_state.clicked = True if st.session_state.clicked: st.success("Button was clicked and remembered!")

import matplotlib.pyplot as plt plt.plot([1, 2, 3]) st.pyplot() # ❌ Warning!

import streamlit as st import matplotlib.pyplot as plt fig, ax = plt.subplots() ax.plot([1, 2, 3]) st.pyplot(fig) # ✅ Correct!

name = st.text_input("Name") st.write(f"Hello {name}") # Becomes empty when you do other actions

name = st.text_input("Name", key="user_name") if st.session_state.user_name: st.write(f"Hello, {st.session_state.user_name}!")

import streamlit as st x = 10 y = 20 z = x + y # No output shown

import streamlit as st x = 10 y = 20 z = x + y st.write(f"Result: {z}") # ✅ Now it shows

# This app has 4 errors. Can you fix them? # 1. Missing import # 2. File not found # 3. Button not working # 4. No output shown name = st.text_input("Enter your name") if st.button("Greet Me"): st.write("Hello " + name) st.image("my_photo.jpg") # photo doesn't exist

import streamlit as st # ✅ Fixed: Added import # ✅ Fixed: Initialize session state if "greeted" not in st.session_state: st.session_state.greeted = False name = st.text_input("Enter your name", key="user_name") # ✅ Saved in session if st.button("Greet Me"): st.session_state.greeted = True # ✅ Fixed: Show output only if name exists if st.session_state.greeted and st.session_state.user_name: st.success(f"Hello, {st.session_state.user_name}! 👋") # ✅ Fixed: Use a working image (or comment out) # st.image("my_photo.jpg") # Removed or replace with valid file st.write("🖼️ No image for now — but app works!")

import streamlit as st import random st.title("🎲 Random Number Generator") if st.button("Generate Number"): num = random.randint(1, 100) st.subheader(f"Your number: {num}") if num > 90: st.balloons() st.success("Wow! A high number!") elif num < 10: st.info("Small but mighty!")

import streamlit as st import random st.title("🧮 Math Quiz") # Generate question if "question" not in st.session_state: a = random.randint(1, 10) b = random.randint(1, 10) st.session_state.question = f"What is {a} + {b}?" st.session_state.answer = a + b # Show question st.write(st.session_state.question) # User input user_ans = st.number_input("Your answer:", step=1) # Check answer if st.button("Check"): if user_ans == st.session_state.answer: st.success("✅ Correct!") st.balloons() else: st.error(f"❌ Wrong! Answer was {st.session_state.answer}") # New question if st.button("New Question"): st.session_state.clear() # Reset st.experimental_rerun()

import streamlit as st import random st.title("🔮 Magic 8-Ball") question = st.text_input("Ask a yes/no question:") responses = [ "Yes, definitely!", "No way.", "Ask again later.", "Very doubtful.", "Signs point to yes.", "Absolutely not.", "Maybe, maybe not.", "Without a doubt!" ] if st.button("Shake the Ball"): if question: answer = random.choice(responses) st.subheader(f"🎱: {answer}") st.snow() else: st.warning("Please ask a question first!")

import streamlit as st st.title("📝 Simple Notes App") # Initialize notes if "notes" not in st.session_state: st.session_state.notes = [] # Add new note new_note = st.text_area("Write a note:") if st.button("Save Note") and new_note: st.session_state.notes.append(new_note) st.success("Note saved!") st.experimental_rerun() # Show all notes if st.session_state.notes: st.subheader("Your Notes") for i, note in enumerate(st.session_state.notes): st.text(f"{i+1}. {note}") else: st.info("No notes yet.")

import streamlit as st st.title("🎵 Music Mood Picker") mood = st.radio( "How do you feel?", ["Happy", "Sad", "Chill", "Energetic"] ) songs = { "Happy": "Pharrell Williams - Happy", "Sad": "Adele - Someone Like You", "Chill": "Lofi Hip Hop Radio - Beats to Relax/Study", "Energetic": "Eye of the Tiger - Survivor" } if st.button("Recommend Song"): st.write(f"🎧 Play: **{songs[mood]}**") st.info("Open YouTube and search for this song!")

import streamlit as st import random st.title("🐾 Pet Name Generator") pet = st.selectbox("Choose pet:", ["Dog", "Cat", "Bird", "Fish"]) names = { "Dog": ["Buddy", "Max", "Bella", "Lucy", "Rocky"], "Cat": ["Whiskers", "Luna", "Milo", "Chloe", "Leo"], "Bird": ["Polly", "Sky", "Rio", "Tweety", "Blue"], "Fish": ["Bubbles", "Nemo", "Finley", "Splash", "Goldie"] } if st.button("Generate Name"): name = random.choice(names[pet]) st.subheader(f"Your {pet}'s name: **{name}** 🎉") st.balloons()

import streamlit as st st.title("🌤️ Weather Advisor") temp = st.slider("Current Temperature (°C)", -10, 50, 25) if temp < 0: advice = "🧣 Wear heavy coat! It's freezing!" st.cold = st.image("https://i.imgur.com/pGdLw0A.png", width=100) # Optional elif temp < 15: advice = "🧥 Wear a jacket." elif temp < 25: advice = "👕 Light clothes are fine." else: advice = "☀️ Stay cool! Wear shorts and drink water." st.subheader(advice)

import streamlit as st import random st.title("🎲 Dice Roller") num_dice = st.slider("How many dice?", 1, 6, 2) if st.button("Roll Dice"): results = [random.randint(1, 6) for _ in range(num_dice)] st.subheader(f"Results: {results}") total = sum(results) st.write(f"**Total: {total}**") if 6 in results: st.balloons() st.success("🎉 You rolled a six!")

import streamlit as st import random import string st.title("🔐 Password Generator") length = st.slider("Password length", 6, 16, 8) if st.button("Generate Password"): chars = string.ascii_letters + string.digits + "!@#$" password = ''.join(random.choice(chars) for _ in range(length)) st.subheader(f"Your password: `{password}`") st.warning("Don’t use this for real accounts! Just for fun.")

import streamlit as st st.title("📊 Favorite Fruit Poll") # Initialize votes if "votes" not in st.session_state: st.session_state.votes = {"Apple": 0, "Banana": 0, "Orange": 0} # Vote choice = st.radio("Choose your favorite:", list(st.session_state.votes.keys())) if st.button("Vote"): st.session_state.votes[choice] += 1 st.success("Thanks for voting!") # Show results st.subheader("Live Results") for fruit, count in st.session_state.votes.items(): st.write(f"{fruit}: {count} votes")