diff --git a/Book4_Ch07_Python_Codes/Streamlit_Bk4_Ch7_01.py b/Book4_Ch07_Python_Codes/Streamlit_Bk4_Ch7_01.py
new file mode 100644
index 0000000..a13f86e
--- /dev/null
+++ b/Book4_Ch07_Python_Codes/Streamlit_Bk4_Ch7_01.py
@@ -0,0 +1,61 @@
+# -*- coding: utf-8 -*-
+"""
+Created on Mon Sep 12 21:19:47 2022
+
+@author: Work
+"""
+
+import pandas as pd
+import plotly.graph_objs as go
+import streamlit as st
+import numpy as np
+
+with st.sidebar:
+    num = st.slider('Number of points for each dimension',
+                    max_value = 20,
+                    min_value = 10,
+                    step = 1)
+    
+x1 = np.linspace(0,1,num)
+x2 = x1
+x3 = x1
+
+xx1,xx2,xx3 = np.meshgrid(x1,x2,x3)
+
+x1_ = xx1.ravel()
+x2_ = xx2.ravel()
+x3_ = xx3.ravel()
+
+#%%
+df = pd.DataFrame({'X': x1_,
+                   'Y': x2_,
+                   'Z': x3_,
+                   'R': (x1_*256).round(),
+                   'G': (x2_*256).round(),
+                   'B': (x3_*256).round()})
+
+trace = go.Scatter3d(x=df.X,
+                      y=df.Y,
+                      z=df.Z,
+                      mode='markers',
+                      marker=dict(size=3,
+                                  color=['rgb({},{},{})'.format(r,g,b) 
+                                         for r,g,b in 
+                                         zip(df.R.values, df.G.values, df.B.values)],
+                                  opacity=0.9,))
+
+data = [trace]
+
+layout = go.Layout(margin=dict(l=0,
+                               r=0,
+                               b=0,
+                               t=0),
+                   scene = dict(
+    xaxis = dict(title='e_1'),
+    yaxis = dict(title='e_2'),
+    zaxis = dict(title='e_3'),),
+)
+
+fig = go.Figure(data=data, layout=layout)
+
+st.plotly_chart(fig)