Add --executable option to env info command (#7547)

docs/managing-environments.md

@@ -39,6 +39,7 @@ pyenv install 3.9.8
 pyenv local 3.9.8  # Activate Python 3.9 for the current project
 poetry install
 ```
+
 {{% /note %}}
 
 {{% note %}}
@@ -106,6 +107,13 @@ to `env info`:
 poetry env info --path
 ```
 
+If you only want to know the path to the python executable (useful for running mypy from a global environment without installing it in the virtual environment), you can pass the `--executable` option
+to `env info`:
+
+```bash
+poetry env info --executable
+```
+
 ## Listing the environments associated with the project
 
 You can also list all the virtual environments associated with the current project
@@ -140,10 +148,13 @@ poetry env remove test-O3eWbxRl-py3.7
 ```
 
 You can delete more than one environment at a time.
+
 ```bash
 poetry env remove python3.6 python3.7 python3.8
 ```
+
 Use the `--all` option to delete all virtual environments at once.
+
 ```bash
 poetry env remove --all
 ```

src/poetry/console/commands/env/info.py

@@ -15,7 +15,12 @@ class EnvInfoCommand(Command):
     name = "env info"
     description = "Displays information about the current environment."
 
-    options = [option("path", "p", "Only display the environment's path.")]
+    options = [
+        option("path", "p", "Only display the environment's path."),
+        option(
+            "executable", "e", "Only display the environment's python executable path."
+        ),
+    ]
 
     def handle(self) -> int:
         from poetry.utils.env import EnvManager
@@ -30,6 +35,14 @@ class EnvInfoCommand(Command):
 
             return 0
 
+        if self.option("executable"):
+            if not env.is_venv():
+                return 1
+
+            self.line(str(env.python))
+
+            return 0
+
         self._display_complete_info(env)
         return 0
 

tests/console/commands/env/test_info.py

@@ -58,3 +58,9 @@ def test_env_info_displays_path_only(tester: CommandTester):
     tester.execute("--path")
     expected = str(Path("/prefix")) + "\n"
     assert tester.io.fetch_output() == expected
+
+
+def test_env_info_displays_executable_only(tester: CommandTester):
+    tester.execute("--executable")
+    expected = str(sys.executable) + "\n"
+    assert tester.io.fetch_output() == expected