Revert of Update Python style guide to point out exceptions only apply to legacy scripts

styleguide/styleguide.md

Index: styleguide/styleguide.md
diff --git a/styleguide/styleguide.md b/styleguide/styleguide.md
index 9fa42482d154f92abe2ff569cc518208a240556b..69e746bd9493c013be26cabc6b33d012be3cc85f 100644
--- a/styleguide/styleguide.md
+++ b/styleguide/styleguide.md
@@ -15,14 +15,16 @@
 
 ## Python
 
-Python code should follow [PEP-8](https://www.python.org/dev/peps/pep-0008/).
-
-Some existing scripts were originally written following Google's internal
-style guideline and have the following two exceptions. New scripts should,
-however, be PEP-8 compliant.
+Python code should follow [PEP-8](https://www.python.org/dev/peps/pep-0008/),
+except:
 
   * Use two-space indentation instead of four-space indentation.
   * Use `CamelCase()` method and function names instead of `unix_hacker_style()` names.
+
+(The rationale for these is mostly legacy: the code was originally written
+following Google's internal style guideline, the cost of updating all of the
+code to PEP-8 compliance was not small, and consistency was seen to be a
+greater virtue than compliance.)
 
 [Depot tools](http://commondatastorage.googleapis.com/chrome-infra-docs/flat/depot_tools/docs/html/depot_tools.html)
 contains a local copy of pylint, appropriately configured.