docs for new progress feature

examples/cp_progress.py

@@ -5,35 +5,15 @@ import os
 import shutil
 import sys
 
-from rich.progress import (
-    BarColumn,
-    DownloadColumn,
-    Progress,
-    TaskID,
-    TextColumn,
-    TimeRemainingColumn,
-    TransferSpeedColumn,
-)
-
-progress = Progress(
-    TextColumn("[bold blue]{task.description}", justify="right"),
-    BarColumn(bar_width=None),
-    "[progress.percentage]{task.percentage:>3.1f}%",
-    "•",
-    DownloadColumn(),
-    "•",
-    TransferSpeedColumn(),
-    "•",
-    TimeRemainingColumn(),
-)
+from rich.progress import Progress
 
 if __name__ == "__main__":
     if len(sys.argv) == 3:
-
-        with progress:
+        with Progress() as progress:
             desc = os.path.basename(sys.argv[1])
-            with progress.read(sys.argv[1], description=desc) as src:
+            with progress.open(sys.argv[1], "rb", description=desc) as src:
                 with open(sys.argv[2], "wb") as dst:
                     shutil.copyfileobj(src, dst)
     else:
+        print("Copy a file with a progress bar.")
         print("Usage:\n\tpython cp_progress.py SRC DST")