[PATCH 16/37] qapi: establish mypy type-checking baseline

[John Snow]

Fix two very minor issues, and then establish a mypy type-checking
baseline.

Like pylint, this should be run from the folder above:

 > mypy --config-file=qapi/mypy.ini qapi/

Signed-off-by: John Snow <jsnow@redhat.com>
---
 scripts/qapi/doc.py    |  3 +-
 scripts/qapi/mypy.ini  | 65 ++++++++++++++++++++++++++++++++++++++++++
 scripts/qapi/schema.py |  3 +-
 3 files changed, 69 insertions(+), 2 deletions(-)
 create mode 100644 scripts/qapi/mypy.ini

diff --git a/scripts/qapi/doc.py b/scripts/qapi/doc.py
index cbf7076ed9..70f7cdfaa6 100644
--- a/scripts/qapi/doc.py
+++ b/scripts/qapi/doc.py
@@ -5,7 +5,8 @@
 """This script produces the documentation of a qapi schema in texinfo format"""
 
 import re
-from .gen import QAPIGenDoc, QAPISchemaVisitor
+from .gen import QAPIGenDoc
+from .schema import QAPISchemaVisitor
 
 
 MSG_FMT = """
diff --git a/scripts/qapi/mypy.ini b/scripts/qapi/mypy.ini
new file mode 100644
index 0000000000..a0f2365a53
--- /dev/null
+++ b/scripts/qapi/mypy.ini
@@ -0,0 +1,65 @@
+[mypy]
+strict = True
+strict_optional = False
+disallow_untyped_calls = False
+python_version = 3.6
+
+[mypy-qapi.commands]
+disallow_untyped_defs = False
+disallow_incomplete_defs = False
+check_untyped_defs = False
+
+[mypy-qapi.doc]
+disallow_subclassing_any = False
+disallow_untyped_defs = False
+disallow_incomplete_defs = False
+
+[mypy-qapi.error]
+disallow_untyped_defs = False
+disallow_incomplete_defs = False
+check_untyped_defs = False
+
+[mypy-qapi.events]
+disallow_untyped_defs = False
+disallow_incomplete_defs = False
+check_untyped_defs = False
+
+[mypy-qapi.expr]
+disallow_untyped_defs = False
+disallow_incomplete_defs = False
+check_untyped_defs = False
+
+[mypy-qapi.gen]
+disallow_untyped_defs = False
+disallow_incomplete_defs = False
+check_untyped_defs = False
+
+[mypy-qapi.introspect]
+disallow_untyped_defs = False
+disallow_incomplete_defs = False
+check_untyped_defs = False
+
+[mypy-qapi.parser]
+disallow_untyped_defs = False
+disallow_incomplete_defs = False
+check_untyped_defs = False
+
+[mypy-qapi.schema]
+disallow_untyped_defs = False
+disallow_incomplete_defs = False
+check_untyped_defs = False
+
+[mypy-qapi.source]
+disallow_untyped_defs = False
+disallow_incomplete_defs = False
+check_untyped_defs = False
+
+[mypy-qapi.types]
+disallow_untyped_defs = False
+disallow_incomplete_defs = False
+check_untyped_defs = False
+
+[mypy-qapi.visit]
+disallow_untyped_defs = False
+disallow_incomplete_defs = False
+check_untyped_defs = False
diff --git a/scripts/qapi/schema.py b/scripts/qapi/schema.py
index b4921b46c9..bb0cd717f1 100644
--- a/scripts/qapi/schema.py
+++ b/scripts/qapi/schema.py
@@ -17,6 +17,7 @@
 import os
 import re
 from collections import OrderedDict
+from typing import Optional
 
 from .common import c_name, POINTER_SUFFIX
 from .error import QAPIError, QAPISemError
@@ -25,7 +26,7 @@
 
 
 class QAPISchemaEntity:
-    meta = None
+    meta: Optional[str] = None
 
     def __init__(self, name, info, doc, ifcond=None, features=None):
         assert name is None or isinstance(name, str)
-- 
2.26.2