add code

app.py

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+import streamlit as st
+from pytube import YouTube
+
+# By Aziz Alto (https://github.com/iamaziz)
+# Thanks to:
+#   https://twitter.com/koladev32/status/1460200958353305601
+#   https://github.com/pytube/pytube
+
+
+class YouTubeDownloader:
+    @staticmethod
+    def run():
+        st.header("YouTube Video Downloader")
+        url = st.text_input("Enter YouTube URL to download:")
+        if url:
+            YouTubeDownloader.validate_url(url)
+            with st.expander("preview video"):
+                st.video(url)
+            if st.button("Download"):
+                YouTubeDownloader.cleanup()
+                file_ = YouTubeDownloader.download_video(url)
+                st.video(file_)
+                YouTubeDownloader.helper_message()
+
+    @staticmethod
+    def download_video(url):
+        with st.spinner("Downloading..."):
+            local_file = (
+                YouTube(url)
+                .streams.filter(progressive=True, file_extension="mp4")
+                .first()
+                .download()
+            )
+            st.success("Downloaded")
+        return local_file
+
+    @staticmethod
+    def validate_url(url):
+        import validators
+
+        if not validators.url(url):
+            st.error("Hi there 👋 URL seems invalid 👽")
+            st.stop()
+
+    @classmethod
+    def cleanup(cls):
+        import pathlib
+        import glob
+
+        junks = glob.glob("*.mp4")
+        for junk in junks:
+            pathlib.Path(junk).unlink()
+
+    @classmethod
+    def helper_message(cls):
+        st.write(
+            "> To save the video to local computer, "
+            "click the vertical ... icon (aka hamburger button) in the bottom-right corner (in the video above) and click download."
+        )
+
+
+if __name__ == "__main__":
+    YouTubeDownloader.run()

requirements.txt

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+streamlit
+pytube
+streamlit-player
+validators