py3: remove compat csv_reader

dvc/repo/metrics/show.py

@@ -10,7 +10,6 @@ from jsonpath_ng.ext import parse
 from dvc.exceptions import NoMetricsError
 from dvc.exceptions import OutputNotFoundError
 from dvc.repo import locked
-from dvc.utils.compat import csv_reader
 from dvc.utils.compat import open
 
 NO_METRICS_FILE_AT_REFERENCE_WARNING = (
@@ -101,7 +100,7 @@ def _format_csv(content, delimiter):
         "0.67528    0.289545        testing\n"
         "0.671502   0.297848        validation\n"
     """
-    reader = csv_reader(io.StringIO(content), delimiter=delimiter)
+    reader = csv.reader(io.StringIO(content), delimiter=delimiter)
     rows = [row for row in reader]
     max_widths = [max(map(len, column)) for column in zip(*rows)]
 

dvc/utils/compat.py

@@ -15,37 +15,6 @@ is_py2 = _ver[0] == 2
 is_py3 = _ver[0] == 3
 
 
-def csv_reader(unicode_csv_data, dialect=None, **kwargs):
-    """csv.reader doesn't support Unicode input, so need to use some tricks
-    to work around this.
-
-    Source: https://docs.python.org/2/library/csv.html#csv-examples
-    """
-    import csv
-
-    dialect = dialect or csv.excel
-
-    if is_py3:
-        # Python3 supports encoding by default, so just return the object
-        for row in csv.reader(unicode_csv_data, dialect=dialect, **kwargs):
-            yield [cell for cell in row]
-
-    else:
-        # csv.py doesn't do Unicode; encode temporarily as UTF-8:
-        reader = csv.reader(
-            utf_8_encoder(unicode_csv_data), dialect=dialect, **kwargs
-        )
-        for row in reader:
-            # decode UTF-8 back to Unicode, cell by cell:
-            yield [unicode(cell, "utf-8") for cell in row]  # noqa: F821
-
-
-def utf_8_encoder(unicode_csv_data):
-    """Source: https://docs.python.org/2/library/csv.html#csv-examples"""
-    for line in unicode_csv_data:
-        yield line.encode("utf-8")
-
-
 def _makedirs(name, mode=0o777, exist_ok=False):
     """Source: https://github.com/python/cpython/blob/
         3ce3dea60646d8a5a1c952469a2eb65f937875b3/Lib/os.py#L196-L226