show source code in lessions page

webpages/pythonx_lessons_pages/pythonx_lesson3.py

@@ -75,3 +75,63 @@ def pythonx_lesson3():
                 st.success('Done')
 
 
+    source_code = """
+
+    from datetime import date, datetime
+    import streamlit as st
+    import yfinance as yf
+    import plotly.express as px
+    
+    # print text formatted by HTML
+    st.markdown(
+        "<h1 style='text-align:center; color:red;'> Sample Stock Price App. </h1>",
+        unsafe_allow_html=True)
+
+    st.write(
+        'We will use the code learned from previous lecture to build an online application for tracing stock price'
+    )
+
+    # print text in markdown
+    st.markdown("## **Check Stock Information**")
+
+    # a list of stock names
+    stock_names = ['MSFT', 'AAPL', 'AMZN', 'GOOGL']
+    # select a stock to check
+    target_stock = st.selectbox('Select a stock to check', options=stock_names)
+
+    st.markdown("## **Check Stock Price History**")
+
+    # start date of the stock infomation, default is the first day of year 2024
+    start_date = st.date_input('Start Date', datetime(2024, 1, 1))
+    # end date of the stock infomation, default is date of today
+    end_date = st.date_input("End Date")
+
+    # get today date
+    today = date.today()
+    if st.button('Submit'):
+        # check valid date
+        if start_date > today or end_date > today:
+            st.write("## **Please select a valid date period.**")
+        else:
+            # download the stock data based on stock name, start/end date
+            data = yf.download(target_stock, start_date, end_date)
+            # show a progress bar
+            with st.spinner(text='In progress'):
+
+                fig = px.line(data,
+                            x=data.index,
+                            y=['Open', 'High', 'Low', 'Close'],
+                            title=target_stock + " Stock Price",
+                            labels={
+                                "value": "Stock Price ($)",
+                                "variable": "Price Type"
+                            })
+                st.write(fig)
+                st.success('Done')
+
+        
+    """
+    st.divider()
+    st.subheader("**Source Code of the Sample App.**")
+    
+    st.code(source_code, line_numbers=True)