Add typing for remainder of io

Author: avinashpancham

pandas/io/excel/_base.py

@@ -12,7 +12,7 @@
 from pandas._config import config
 
 from pandas._libs.parsers import STR_NA_VALUES
-from pandas._typing import Buffer, FilePathOrBuffer, StorageOptions
+from pandas._typing import Buffer, DtypeArg, FilePathOrBuffer, StorageOptions
 from pandas.compat._optional import import_optional_dependency
 from pandas.errors import EmptyDataError
 from pandas.util._decorators import Appender, deprecate_nonkeyword_arguments, doc
@@ -309,7 +309,7 @@ def read_excel(
     index_col=None,
     usecols=None,
     squeeze=False,
-    dtype=None,
+    dtype: Optional[DtypeArg] = None,
     engine=None,
     converters=None,
     true_values=None,
@@ -433,7 +433,7 @@ def parse(
         index_col=None,
         usecols=None,
         squeeze=False,
-        dtype=None,
+        dtype: Optional[DtypeArg] = None,
         true_values=None,
         false_values=None,
         skiprows=None,

pandas/io/json/_json.py

@@ -11,6 +11,7 @@
 from pandas._libs.tslibs import iNaT
 from pandas._typing import (
     CompressionOptions,
+    DtypeArg,
     IndexLabel,
     JSONSerializable,
     StorageOptions,
@@ -296,7 +297,7 @@ def read_json(
     path_or_buf=None,
     orient=None,
     typ="frame",
-    dtype=None,
+    dtype: Optional[DtypeArg] = None,
     convert_axes=None,
     convert_dates=True,
     keep_default_dates: bool = True,
@@ -775,7 +776,7 @@ def __init__(
         self,
         json,
         orient,
-        dtype=None,
+        dtype: Optional[DtypeArg] = None,
         convert_axes=True,
         convert_dates=True,
         keep_default_dates=False,

pandas/io/parsers.py

@@ -31,7 +31,7 @@
 import pandas._libs.parsers as parsers
 from pandas._libs.parsers import STR_NA_VALUES
 from pandas._libs.tslibs import parsing
-from pandas._typing import FilePathOrBuffer, StorageOptions, Union
+from pandas._typing import DtypeArg, FilePathOrBuffer, StorageOptions, Union
 from pandas.errors import (
     AbstractMethodError,
     EmptyDataError,
@@ -546,7 +546,7 @@ def read_csv(
     prefix=None,
     mangle_dupe_cols=True,
     # General Parsing Configuration
-    dtype=None,
+    dtype: Optional[DtypeArg] = None,
     engine=None,
     converters=None,
     true_values=None,
@@ -626,7 +626,7 @@ def read_table(
     prefix=None,
     mangle_dupe_cols=True,
     # General Parsing Configuration
-    dtype=None,
+    dtype: Optional[DtypeArg] = None,
     engine=None,
     converters=None,
     true_values=None,
@@ -3502,7 +3502,7 @@ def _clean_index_names(columns, index_col, unnamed_cols):
     return index_names, columns, index_col
 
 
-def _get_empty_meta(columns, index_col, index_names, dtype=None):
+def _get_empty_meta(columns, index_col, index_names, dtype: Optional[DtypeArg] = None):
     columns = list(columns)
 
     # Convert `dtype` to a defaultdict of some kind.

pandas/io/pytables.py

@@ -29,7 +29,14 @@
 
 from pandas._libs import lib, writers as libwriters
 from pandas._libs.tslibs import timezones
-from pandas._typing import ArrayLike, FrameOrSeries, FrameOrSeriesUnion, Label, Shape
+from pandas._typing import (
+    ArrayLike,
+    DtypeArg,
+    FrameOrSeries,
+    FrameOrSeriesUnion,
+    Label,
+    Shape,
+)
 from pandas.compat._optional import import_optional_dependency
 from pandas.compat.pickle_compat import patch_pickle
 from pandas.errors import PerformanceWarning
@@ -2259,7 +2266,7 @@ def __init__(
         table=None,
         meta=None,
         metadata=None,
-        dtype=None,
+        dtype: Optional[DtypeArg] = None,
         data=None,
     ):
         super().__init__(