feat: slider

.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/python,linux,macos,windows
+# Edit at https://www.toptal.com/developers/gitignore?templates=python,linux,macos,windows
+
+### Linux ###
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
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+.nfs*
+
+### macOS ###
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+
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+### Python Patch ###
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+
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+# End of https://www.toptal.com/developers/gitignore/api/python,linux,macos,windows

.vscode/settings.json

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+{
+  "[python]": {
+    "editor.defaultFormatter": "ms-python.black-formatter"
+  }
+}

app.py

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+import streamlit as st
+
+st.title("try my demo app")
+st.markdown("this is my description")
+
+x = st.slider("select a value")
+st.write(x, "squared is", x * x)