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/pylint/pyreverse/utils.py b/pylint/pyreverse/utils.py
index fea9bda79..06f8d3b7e 100644
--- a/pylint/pyreverse/utils.py
+++ b/pylint/pyreverse/utils.py
@@ -35,7 +35,7 @@ def get_default_options():
     if home:
         rcfile = os.path.join(home, RCFILE)
         try:
-            with open(rcfile) as file_handle:
+            with open(rcfile, encoding="utf-8") as file_handle:
                 options = file_handle.read().split()
         except OSError:
             pass  # ignore if no config file found