Add unspecified-encoding checker #3826 (#4753)

* Add unspecified-encoding checker #3826
This adds an unspecified-encoding checker that adds a warning
whenever open() is called without an explicit encoding argument.
This closes #3826

* Update tests to conform to unspecified-encoding
With addition of the unspecified-encoding checker calls of open()
need an encoding argument.
Where necessary this argument has been added, or the message has been
disabled.
This also includes small linting changes to a small number
of tests. Their test-data has been updated to reflect new line numbers.

* Update scripts to conform to unspecified-encoding
With addition of the unspecified-encoding checker calls of open()
need an encoding argument.
Where necessary this argument has been added.

* Update pylint to conform to unspecified-encoding
With addition of the unspecified-encoding checker calls of open()
need an encoding argument.
Where necessary this argument has been added.

Co-authored-by: Marc Mueller <30130371+cdce8p@users.noreply.github.com>
Co-authored-by: Marc Mueller <30130371+cdce8p@users.noreply.github.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/checkers/unittest_similar.py b/tests/checkers/unittest_similar.py
index 8edc87bca..ca64bdba3 100644
--- a/tests/checkers/unittest_similar.py
+++ b/tests/checkers/unittest_similar.py
@@ -449,7 +449,7 @@ def test_get_map_data():
     # Manually perform a 'map' type function
     for source_fname in source_streams:
         sim = similar.SimilarChecker(linter)
-        with open(source_fname) as stream:
+        with open(source_fname, encoding="utf-8") as stream:
             sim.append_stream(source_fname, stream)
         # The map bit, can you tell? ;)
         data.extend(sim.get_map_data())