Fix error in test suite under Python 3.6.

dataenforce/__init__.py

@@ -15,12 +15,14 @@
 import inspect
 from functools import wraps
 import pandas as pd
-from typing import _TypingEmpty, _tp_cache, Generic,get_type_hints
+from typing import _TypingEmpty, _tp_cache, Generic, get_type_hints
 import numpy as np
 try:
-    from typing import GenericMeta # Python 3.6
-except ImportError: # Python 3.7
-    class GenericMeta(type): pass
+    from typing import GenericMeta  # Python 3.6
+except ImportError:  # Python 3.7
+    class GenericMeta(type):
+        pass
+
 
 def validate(f):
     signature = inspect.signature(f)
@@ -50,6 +52,7 @@ def wrapper(*args, **kwargs):
 
     return wrapper
 
+
 def _get_columns_dtypes(p):
     columns = set()
     dtypes = {}
@@ -74,6 +77,7 @@ def _get_columns_dtypes(p):
 
     return columns, dtypes
 
+
 class DatasetMeta(GenericMeta):
     """Metaclass for Dataset (internal)."""
 
@@ -101,6 +105,7 @@ def __getitem__(self, parameters):
 
         return meta
 
+
 class Dataset(pd.DataFrame, extra=Generic, metaclass=DatasetMeta):
     """Defines type Dataset to serve as column name & type enforcement for pandas DataFrames"""
     __slots__ = ()

tests/test_validate.py

@@ -55,15 +55,18 @@ def process(data: Dataset[...]):
     with pytest.raises(TypeError):
         process(False)
 
+
 def test_validate_dtypes():
-    df = pd.DataFrame(dict(a=[1,2,3], b=[4.1,5.1,6.1], c=["a", "b", "c"], d=[datetime.now().replace(hour=x) for x in [7,8,9]]))
+    df = pd.DataFrame(dict(a=[1, 2, 3], b=[4.1, 5.1, 6.1], c=["a", "b", "c"], d=[datetime.now().replace(hour=x) for x in [7, 8, 9]]))
 
     @validate
-    def process1(data: Dataset["a": int, "b": np.float, "c": object, "d": np.datetime64]):
+    def process1(data: Dataset["a": np.int64, "b": np.float, "c": object, "d": np.datetime64]):
         pass
+
     @validate
     def process2(data: Dataset["a": float, "b", ...]):
         pass
+
     @validate
     def process3(data: Dataset["a": np.datetime64, ...]):
         pass