Issue #7328: don't corrupt sys.path when running pydoc with the -m switch

Lib/pydoc.py

@@ -2254,11 +2254,13 @@ def cli():
     import getopt
     class BadUsage: pass
 
-    # Scripts don't get the current directory in their path by default.
-    scriptdir = os.path.dirname(sys.argv[0])
-    if scriptdir in sys.path:
-        sys.path.remove(scriptdir)
-    sys.path.insert(0, '.')
+    # Scripts don't get the current directory in their path by default
+    # unless they are run with the '-m' switch
+    if '' not in sys.path:
+        scriptdir = os.path.dirname(sys.argv[0])
+        if scriptdir in sys.path:
+            sys.path.remove(scriptdir)
+        sys.path.insert(0, '.')
 
     try:
         opts, args = getopt.getopt(sys.argv[1:], 'gk:p:w')

Misc/NEWS

@@ -429,6 +429,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #7328: pydoc no longer corrupts sys.path when run with the '-m' switch
+
 - Issue #2054: ftplib now provides an FTP_TLS class to do secure FTP using
   TLS or SSL.  Patch by Giampaolo Rodola'.