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, 3 insertions, 1 deletions

diff --git a/pylint/pyreverse/writer.py b/pylint/pyreverse/writer.py
index db54c3f0b..f45783c49 100644
--- a/pylint/pyreverse/writer.py
+++ b/pylint/pyreverse/writer.py
@@ -187,7 +187,9 @@ class VCGWriter(DiagramWriter):
 
     def set_printer(self, file_name, basename):
         """initialize VCGWriter for a UML graph"""
-        self.graph_file = open(file_name, "w+")  # pylint: disable=consider-using-with
+        self.graph_file = open(  # pylint: disable=consider-using-with
+            file_name, "w+", encoding="utf-8"
+        )
         self.printer = VCGPrinter(self.graph_file)
         self.printer.open_graph(
             title=basename,