Add mypy and apply suggestions

Note that this was run with --ignore-missing-imports.

Author: Drvanon

docs/conf.py

@@ -206,7 +206,7 @@
 
 # -- Options for LaTeX output ---------------------------------------------
 
-latex_elements = {
+latex_elements: dict[str, str] = {
     # The paper size ('letterpaper' or 'a4paper').
     #'papersize': 'letterpaper',
     # The font size ('10pt', '11pt' or '12pt').

functional/io.py

@@ -4,6 +4,8 @@
 import io
 import builtins
 
+from typing import Optional
+
 
 WRITE_MODE = "wt"
 
@@ -78,7 +80,7 @@ def read(self):
 
 
 class CompressedFile(ReusableFile):
-    magic_bytes = None
+    magic_bytes: Optional[bytes] = None
 
     # pylint: disable=too-many-instance-attributes
     def __init__(
@@ -280,7 +282,7 @@ def read(self):
 
 
 COMPRESSION_CLASSES = [GZFile, BZ2File, XZFile]
-N_COMPRESSION_CHECK_BYTES = max(len(cls.magic_bytes) for cls in COMPRESSION_CLASSES)
+N_COMPRESSION_CHECK_BYTES = max(len(cls.magic_bytes) for cls in COMPRESSION_CLASSES) # type: ignore
 
 
 def get_read_function(filename, disable_compression):

functional/test/test_util.py

@@ -14,7 +14,7 @@
     default_value,
 )
 
-Data = namedtuple("Tuple", "x y")
+Data = namedtuple("Data", "x y")
 
 
 class TestUtil(unittest.TestCase):

poetry.lock

@@ -46,6 +46,9 @@ pytest-cov = "^4.0"
 codecov = "^2.0.22"
 coverage = "^5.0.0"
 
+[tool.poetry.group.dev.dependencies]
+mypy = "^1.1.1"
+
 [build-system]
 requires = ["poetry>=0.12"]
 build-backend = "poetry.masonry.api"