python-mode · Copilot · Apr 21, 2026 · Apr 21, 2026 · Apr 21, 2026 · Apr 21, 2026
diff --git a/doc/pymode.txt b/doc/pymode.txt
@@ -268,6 +268,9 @@ Set path to virtualenv manually                      *'g:pymode_virtualenv_path'
 Commands:
 *:PymodeRun* -- Run current buffer or selection
 
+When a virtualenv is activated with |:PymodeVirtualenv|, *:PymodeRun* uses the
+virtualenv's Python executable.
+
 Turn on the run code script                                      *'g:pymode_run'*
 >
     let g:pymode_run = 1

diff --git a/pymode/run.py b/pymode/run.py
@@ -1,5 +1,8 @@
 """ Code runnning support. """
+import os
+import subprocess
 import sys
+import tempfile
 from io import StringIO
 from re import compile as re
 
@@ -25,46 +28,103 @@ def run_code():
     elif encoding.match(lines[1]):
         lines.pop(1)
 
-    context = dict(
-        __name__='__main__',
-        __file__=env.var('expand("%:p")'),
-        input=env.user_input,
-        raw_input=env.user_input)
+    python_cmd = __get_virtualenv_python()
+    if python_cmd:
+        result = __run_with_external_python(python_cmd, lines)
+        if result is not None:
+            output, err = result
+        else:
+            python_cmd = None
+
+    if not python_cmd:
+        context = dict(
+            __name__='__main__',
+            __file__=env.var('expand("%:p")'),
+            input=env.user_input,
+            raw_input=env.user_input)
+
+        sys.stdout, stdout_ = StringIO(), sys.stdout
+        sys.stderr, stderr_ = StringIO(), sys.stderr
+
+        try:
+            code = compile('\n'.join(lines) + '\n', env.curbuf.name, 'exec')
+            sys.path.insert(0, env.curdir)
+            exec(code, context) # noqa
+            sys.path.pop(0)
+
+        except SystemExit as e:
+            if e.code:
+                # A non-false code indicates abnormal termination.
+                # A false code will be treated as a
+                # successful run, and the error will be hidden from Vim
+                env.error("Script exited with code %s" % e.code)
+                return env.stop()
+
+        except Exception:
+            import traceback
+            err = traceback.format_exc()
+
+        else:
+            err = sys.stderr.getvalue()
+
+        output = sys.stdout.getvalue()
+        sys.stdout, sys.stderr = stdout_, stderr_
 
-    sys.stdout, stdout_ = StringIO(), sys.stdout
-    sys.stderr, stderr_ = StringIO(), sys.stderr
-
-    try:
-        code = compile('\n'.join(lines) + '\n', env.curbuf.name, 'exec')
-        sys.path.insert(0, env.curdir)
-        exec(code, context) # noqa
-        sys.path.pop(0)
-
-    except SystemExit as e:
-        if e.code:
-            # A non-false code indicates abnormal termination.
-            # A false code will be treated as a
-            # successful run, and the error will be hidden from Vim
-            env.error("Script exited with code %s" % e.code)
-            return env.stop()
-
-    except Exception:
-        import traceback
-        err = traceback.format_exc()
-
-    else:
-        err = sys.stderr.getvalue()
-
-    output = sys.stdout.getvalue()
     output = env.prepare_value(output, dumps=False)
-    sys.stdout, sys.stderr = stdout_, stderr_
 
     errors += [er for er in err.splitlines() if er and "<string>" not in er]
 
     env.let('l:traceback', errors[2:])
     env.let('l:output', [s for s in output.splitlines()])
 
 
+def __get_virtualenv_python():
+    path = env.var('g:pymode_virtualenv_enabled', silence=True, default='')
+    if not path:
+        return None
+
+    if os.name == 'nt':
+        candidates = [
+            os.path.join(path, 'Scripts', 'python.exe'),
+            os.path.join(path, 'Scripts', 'python'),
+        ]
+    else:
+        candidates = [os.path.join(path, 'bin', 'python')]
+
+    for candidate in candidates:
+        if os.path.isfile(candidate) and os.access(candidate, os.X_OK):
+            return candidate
+
+    return None
+
+
+def __run_with_external_python(python_cmd, lines):
+    source = '\n'.join(lines) + '\n'
+    temp_file_path = None
+    try:
+        with tempfile.NamedTemporaryFile(
+            mode='w', suffix='.py', delete=False, encoding='utf-8'
+        ) as temp_file:
+            temp_file.write(source)
+            temp_file_path = temp_file.name
+
+        process = subprocess.Popen(
+            [python_cmd, temp_file_path],
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            cwd=env.curdir,
+            text=True)
+        output, err = process.communicate()
+    except OSError as exc:
+        env.debug('Failed to execute external python', python_cmd, exc)
+        return None
+    finally:
+        if temp_file_path and os.path.exists(temp_file_path):
+            os.unlink(temp_file_path)
+
+    return output, err
+
+
 def __prepare_lines(line1, line2):
 
     lines = [l.rstrip() for l in env.lines[int(line1) - 1:int(line2)]]

diff --git a/tests/vader/commands.vader b/tests/vader/commands.vader
@@ -86,6 +86,47 @@ Execute (Test PymodeRun command):
     Assert 1, 'PymodeRun executed without producing a run buffer'
   endif
 
+Execute (Test PymodeRun uses active virtualenv python):
+  if exists(':PymodeRun') && exists(':PymodeVirtualenv')
+    let pycmd = executable('python3') ? 'python3' : (executable('python') ? 'python' : '')
+    if !empty(pycmd)
+      let temp_dir = tempname()
+      call mkdir(temp_dir, 'p')
+      let venv_dir = temp_dir . '/.venv'
+      let sample_file = temp_dir . '/run_from_venv.py'
+
+      call writefile(['import sys', 'print(sys.executable)'], sample_file)
+
+      call system(pycmd . ' -m venv ' . shellescape(venv_dir))
+      if v:shell_error == 0
+        execute 'edit ' . fnameescape(sample_file)
+        let g:pymode_virtualenv = 1
+        execute 'PymodeVirtualenv ' . string(venv_dir)
+        PymodeRun
+
+        let run_buffer = bufnr('__run__')
+        if run_buffer != -1
+          execute 'buffer ' . run_buffer
+          let run_output = substitute(join(getline(1, '$'), "\n"), '\\', '/', 'g')
+          let expected_python = has('win32') || has('win64') ? venv_dir . '/Scripts/python.exe' : venv_dir . '/bin/python'
+          let expected_python = substitute(expected_python, '\\', '/', 'g')
+          Assert stridx(run_output, expected_python) >= 0, 'PymodeRun should execute with virtualenv python executable'
+        else
+          Assert 0, 'PymodeRun should create run buffer when using virtualenv'
+        endif
+      else
+        Assert 1, 'Unable to create test virtualenv in this environment - test skipped'
+      endif
+
+      call delete(sample_file)
+      call delete(temp_dir, 'rf')
+    else
+      Assert 1, 'No python executable available to create virtualenv - test skipped'
+    endif
+  else
+    Assert 1, 'PymodeRun/PymodeVirtualenv command not available - test skipped'
+  endif
+
 # Test PymodeLint command
 Given python (Python code with lint issues):
   import math, sys;
@@ -275,4 +316,4 @@ Execute (Test PymodeRun with pymoderun_sample.py):
     endif
   else
     Assert 1, 'PymodeRun command not available - test skipped'
-  endif
+  endif