Add inline type annotations (#1089)

* crypto: Add type annotations

* Don’t redefine var

mypy complains about the redefinition

* _util: Add type annotations

* rand: Add type annotations

* Prepare package & CI for running mypy

* fix toxenv name

Co-authored-by: Maximilian Hils <github@maximilianhils.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 1c99fcb..4d69405 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = {pypy,pypy3,py36,py37,py38,py39,py310}{,-cryptographyMain,-cryptographyMinimum}{,-useWheel}{,-randomorder},py37-twistedTrunk,check-manifest,flake8,docs,coverage-report
+envlist = {pypy,pypy3,py36,py37,py38,py39,py310}{,-cryptographyMain,-cryptographyMinimum}{,-useWheel}{,-randomorder},py37-twistedTrunk,check-manifest,flake8,py36-mypy,docs,coverage-report
 
 [testenv]
 whitelist_externals =
@@ -44,6 +44,13 @@ commands =
     black --check .
     flake8 .
 
+[testenv:py36-mypy]
+deps =
+    mypy==0.950
+skip_install = true
+commands =
+    mypy src
+
 [testenv:check-manifest]
 deps =
     check-manifest