BUG: Fixed typo-related bug to resolve pandas-dev#9266

Fixed typo in _convert_to_ndarrays

Added tests for typo fix

Author: captainsafia

doc/source/whatsnew/v0.17.0.txt

@@ -390,3 +390,5 @@ Bug Fixes
 - Reading "famafrench" data via ``DataReader`` results in HTTP 404 error because of the website url is changed (:issue:`10591`).
 
 - Bug in `read_msgpack` where DataFrame to decode has duplicate column names (:issue:`9618`)
+
+- Bug in `_convert_to_ndarrays` which caused an `AttributeError` to be raised at times (:issue:`9266`)

pandas/io/parsers.py

@@ -995,7 +995,7 @@ def _convert_to_ndarrays(self, dct, na_values, na_fvalues, verbose=False,
                 try:
                     values = lib.map_infer(values, conv_f)
                 except ValueError:
-                    mask = lib.ismember(values, na_values).view(np.uin8)
+                    mask = lib.ismember(values, na_values).view(np.uint8)
                     values = lib.map_infer_mask(values, conv_f, mask)
                 coerce_type = False
 

pandas/io/tests/test_parsers.py

@@ -2654,6 +2654,27 @@ def test_fwf_regression(self):
             res = df.loc[:,c]
             self.assertTrue(len(res))
 
+    def test_fwf_for_uint8(self):
+        data = """1421302965.213420    PRI=3 PGN=0xef00      DST=0x17 SRC=0x28    04 154 00 00 00 00 00 127
+1421302964.226776    PRI=6 PGN=0xf002               SRC=0x47    243 00 00 255 247 00 00 71"""
+        df = read_fwf(StringIO(data), 
+                colspecs=[(0,17),(25,26),(33,37),(49,51),(58,62),(63,1000)],
+                names=['time','pri','pgn','dst','src','data'],
+                converters={
+                        'pgn':lambda x: int(x,16),
+                        'src':lambda x: int(x,16),
+                        'dst':lambda x: int(x,16),
+                        'data':lambda x: len(x.split(' '))})
+
+        expected = DataFrame([[1421302965.213420,3,61184,23,40,8], 
+                [1421302964.226776,6,61442,None, 71,8]],
+                columns = ["time", "pri", "pgn", "dst", "src","data"])
+
+        # Hacky fix for dst column dtype
+        expected["dst"] = expected["dst"].astype(object)
+
+        tm.assert_frame_equal(df, expected)
+
     def test_fwf_compression(self):
         try:
             import gzip