Include the Python variant suffix in "Using Python ..." messages (#16536)

See #16253 (comment)

Author: zanieb

crates/uv/src/commands/pip/operations.rs

@@ -743,9 +743,10 @@ pub(crate) fn report_interpreter(
                 printer.stderr(),
                 "{}",
                 format!(
-                    "Using {} {}",
+                    "Using {} {}{}",
                     implementation.pretty(),
-                    interpreter.python_version()
+                    interpreter.python_version(),
+                    interpreter.variant().suffix(),
                 )
                 .dimmed()
             )?;
@@ -754,9 +755,10 @@ pub(crate) fn report_interpreter(
                 printer.stderr(),
                 "{}",
                 format!(
-                    "Using {} {} interpreter at: {}",
+                    "Using {} {}{} interpreter at: {}",
                     implementation.pretty(),
                     interpreter.python_version(),
+                    interpreter.variant().suffix(),
                     interpreter.sys_executable().user_display()
                 )
                 .dimmed()
@@ -766,16 +768,18 @@ pub(crate) fn report_interpreter(
         if managed {
             writeln!(
                 printer.stderr(),
-                "Using {} {}",
+                "Using {} {}{}",
                 implementation.pretty(),
-                interpreter.python_version().cyan()
+                interpreter.python_version().cyan(),
+                interpreter.variant().suffix().cyan()
             )?;
         } else {
             writeln!(
                 printer.stderr(),
-                "Using {} {} interpreter at: {}",
+                "Using {} {}{} interpreter at: {}",
                 implementation.pretty(),
                 interpreter.python_version(),
+                interpreter.variant().suffix(),
                 interpreter.sys_executable().user_display().cyan()
             )?;
         }

crates/uv/src/commands/project/mod.rs

@@ -1008,16 +1008,18 @@ impl ProjectInterpreter {
         if managed {
             writeln!(
                 printer.stderr(),
-                "Using {} {}",
+                "Using {} {}{}",
                 implementation.pretty(),
-                interpreter.python_version().cyan()
+                interpreter.python_version().cyan(),
+                interpreter.variant().suffix().cyan(),
             )?;
         } else {
             writeln!(
                 printer.stderr(),
-                "Using {} {} interpreter at: {}",
+                "Using {} {}{} interpreter at: {}",
                 implementation.pretty(),
                 interpreter.python_version(),
+                interpreter.variant().suffix(),
                 interpreter.sys_executable().user_display().cyan()
             )?;
         }

crates/uv/tests/it/python_install.rs

@@ -1130,7 +1130,7 @@ fn python_install_freethreaded() {
     ----- stdout -----
 
     ----- stderr -----
-    Using CPython 3.13.9
+    Using CPython 3.13.9t
     Creating virtual environment at: .venv
     Activate with: source .venv/[BIN]/activate
     ");