Use asymtopic equals and use "Transfer" instead of "Transferring"

Author: sfc-gh-jkew

modin/pandas/base.py

@@ -4508,15 +4508,30 @@ def set_backend(
             # Format the transfer string to be relatively short, but informative. Each
             # backend is given an allowable width of 10 and the shape integers use the
             # general format to use scientific notation when needed.
+            std_field_length = 10
             operation_str = switch_operation
+            self_backend_str = self_backend
+            normalized_backend_str = normalized_backend
             if switch_operation is None:
                 operation_str = ""
             # Provide the switch_operation; and specifically only the method, so
             # DataFrame.merge would become "merge"
-            max_shape_str = f"({max_rows:.0g},{max_cols:.0g})"
+            operation_str = operation_str.split(".")[-1]
+            # truncate all strings to the field length if needed
+            if len(operation_str) > 15:
+                operation_str = operation_str[: 15 - 3] + "..."
+            if len(self_backend_str) > std_field_length:
+                self_backend_str = self_backend_str[: std_field_length - 3] + "..."
+            if len(normalized_backend_str) > std_field_length:
+                normalized_backend_str = (
+                    normalized_backend_str[: std_field_length - 3] + "..."
+                )
+
+            # format the estimated max shape
+            max_shape_str = f"({max_rows:.0g}, {max_cols:.0g})"
             desc = (
-                f"Transferring: {self_backend:>10.10} → {normalized_backend:<10.10} "
-                + f" | {operation_str.split('.')[-1]:^10.10} | est. max shape {max_shape_str:<13.13}"
+                f"Transfer: {self_backend_str:>10.10} → {normalized_backend_str:<10.10} "
+                + f" | {operation_str:^15.15} ≃ {max_shape_str:<10.10}"
             )
 
             if ShowBackendSwitchProgress.get():

modin/tests/pandas/native_df_interoperability/test_compiler_caster.py

@@ -857,7 +857,7 @@ def test_progress_bar_shows_modin_pandas_for_general_functions(self):
             desc = call_args[1]["desc"]  # Get the 'desc' keyword argument
 
             assert desc.startswith(
-                "Transferring: Big_Data_C → Small_Data  | read_json  | est. max shape (9,1)     "
+                "Transfer: Big_Dat... → Small_D...  |    read_json    ≃ (9, 1)    "
             )
 
     def test_agg(self):

modin/tests/pandas/test_backend.py

@@ -424,11 +424,11 @@ def do_groupby(series):
     [
         (
             None,
-            "Transferring: Python_Tes → Pandas      |            | est. max shape (3,1)     ",
+            "Transfer: Python_... → Pandas      |                 ≃ (3, 1)    ",
         ),
         (
             "test_operation",
-            "Transferring: Python_Tes → Pandas      | test_opera | est. max shape (3,1)     ",
+            "Transfer: Python_... → Pandas      | test_operation  ≃ (3, 1)    ",
         ),
     ],
 )