STYLE: specify encodings when opening files

.pre-commit-config.yaml

@@ -83,9 +83,6 @@ repos:
     hooks:
     -   id: pylint
         stages: [manual]
--   repo: https://github.com/pycqa/pylint
-    rev: v2.16.2
-    hooks:
     -   id: pylint
         alias: redefined-outer-name
         name: Redefining name from outer scope
@@ -99,6 +96,11 @@ repos:
             |^pandas/conftest\.py  # keep excluded
         args: [--disable=all, --enable=redefined-outer-name]
         stages: [manual]
+    -   id: pylint
+        alias: unspecified-encoding
+        name: Using open without explicitly specifying an encoding
+        args: [--disable=all, --enable=unspecified-encoding]
+        stages: [manual]
 -   repo: https://github.com/PyCQA/isort
     rev: 5.12.0
     hooks:

asv_bench/benchmarks/io/csv.py

@@ -444,7 +444,7 @@ class ReadCSVMemoryGrowth(BaseIO):
     param_names = ["engine"]
 
     def setup(self, engine):
-        with open(self.fname, "w") as f:
+        with open(self.fname, "w",encoding="utf-8") as f:
             for i in range(self.num_rows):
                 f.write(f"{i}\n")