From fc1af1cff377ce68a5d2c54a415084632b4e53ab Mon Sep 17 00:00:00 2001
From: Hsiao-Wei Wang <hsiaowei.eth@gmail.com>
Date: Tue, 25 May 2021 21:13:12 +0800
Subject: [PATCH] [pyspec] Use mainnet.py as the default spec

---
 setup.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/setup.py b/setup.py
index 8095e3b7f..77b38b640 100644
--- a/setup.py
+++ b/setup.py
@@ -912,7 +912,8 @@ class PySpecCommand(Command):
 
         if not self.dry_run:
             with open(os.path.join(self.out_dir, '__init__.py'), 'w') as out:
-                out.write("")
+                # `mainnet` is the default spec.
+                out.write("from . import mainnet as spec\n")
 
 
 class BuildPyCommand(build_py):