Added a progress bar and fixed some typos.

main.py

@@ -1,22 +1,33 @@
 from pytube import YouTube
 
-# Asks the User for a youtube video URL.
+# Asks the User for a YouTube video URL.
 def get_video_url():
     try:
         video_url = input('YouTube video URL: ')
         return video_url
     except Exception as e:
-        print(f"An error has occured: {e}")
+        print(f"An error has occurred: {e}")
 
-# Download the video.
+# Callback function to show the progress bar.
+def progress_bar(stream, _chunk, bytes_remaining):
+    current = ((stream.filesize - bytes_remaining)/stream.filesize)
+    percent = ('{0:.1f}').format(current * 100)
+    progress = int(50 * current)
+    status = '█' * progress + '-' * (50 - progress)
+    print(f'\r|{status}| {percent}%', end='')
+
+# Downloads the video.
 def video_download(video_url):
     try:
-        youtube = YouTube(video_url)
+        youtube = YouTube(video_url, on_progress_callback=progress_bar)
         video = youtube.streams.get_highest_resolution()
+        print("Downloading...")
         video.download()
+        print("\nDownload complete!")
     except Exception as e:
-        print(f"An error has occured: {e}")
+        print(f"An error has occurred: {e}")
 
+# Program main function.
 def main():
     try:
         video_url = get_video_url()
@@ -24,7 +35,7 @@ def main():
     except KeyboardInterrupt:
         print("\nSession ended by user.")
     except Exception as e:
-        print(f"{e}")
+        print(f"An error has occurred: {e}")
 
 if __name__ == "__main__":
     main()