[IMPR] Keep Python 2.7 compatibility with pwb.py caller script

Change-Id: I9b8c12a57b12bc92010b4c0c49fb49357276d45c
---
M pwb.py
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pwb.py b/pwb.py
index e515776..7c061a1 100644
--- a/pwb.py
+++ b/pwb.py
@@ -7,9 +7,7 @@
 #
 # Distributed under the terms of the MIT license.
 #
-import runpy
 import sys
-from pathlib import Path
 
 VERSIONS_REQUIRED_MESSAGE = """
 Pywikibot is not available on:
@@ -30,6 +28,8 @@
 
 def main():
     """Entry point for :func:`tests.utils.execute_pwb`."""
+    import runpy
+    from pathlib import Path
     path = Path().resolve() / 'pywikibot' / 'scripts' / 'wrapper.py'
     runpy.run_path(str(path), run_name='__main__')
 

