Remove unused private attributes in stata module

Author: tqa236

pandas/io/stata.py

@@ -1121,11 +1121,8 @@ def __init__(
 
         # State variables for the file
         self._close_file: Callable[[], None] | None = None
-        self._missing_values = False
-        self._can_read_value_labels = False
         self._column_selector_set = False
         self._value_labels_read = False
-        self._data_read = False
         self._dtype: np.dtype | None = None
         self._lines_read = 0
 
@@ -1219,12 +1216,6 @@ def _read_int64(self) -> int:
     def _read_char8(self) -> bytes:
         return struct.unpack("c", self._path_or_buf.read(1))[0]
 
-    def _read_int16_count(self, count: int) -> tuple[int, ...]:
-        return struct.unpack(
-            f"{self._byteorder}{'h' * count}",
-            self._path_or_buf.read(2 * count),
-        )
-
     def _read_header(self) -> None:
         first_char = self._read_char8()
         if first_char == b"<":
@@ -1276,7 +1267,6 @@ def _read_new_header(self) -> None:
         self._varlist = self._get_varlist()
 
         self._path_or_buf.seek(self._seek_sortlist)
-        self._srtlist = self._read_int16_count(self._nvar + 1)[:-1]
 
         self._path_or_buf.seek(self._seek_formats)
         self._fmtlist = self._get_fmtlist()
@@ -1399,7 +1389,6 @@ def _read_old_header(self, first_char: bytes) -> None:
             raise ValueError(_version_error.format(version=self._format_version))
         self._set_encoding()
         self._byteorder = ">" if self._read_int8() == 0x1 else "<"
-        self._filetype = self._read_int8()
         self._path_or_buf.read(1)  # unused
 
         self._nvar = self._read_uint16()
@@ -1441,7 +1430,6 @@ def _read_old_header(self, first_char: bytes) -> None:
             self._varlist = [
                 self._decode(self._path_or_buf.read(9)) for _ in range(self._nvar)
             ]
-        self._srtlist = self._read_int16_count(self._nvar + 1)[:-1]
 
         self._fmtlist = self._get_fmtlist()
 
@@ -1650,8 +1638,6 @@ def read(
         # StopIteration.  If reading the whole thing return an empty
         # data frame.
         if (self._nobs == 0) and nrows == 0:
-            self._can_read_value_labels = True
-            self._data_read = True
             data = DataFrame(columns=self._varlist)
             # Apply dtypes correctly
             for i, col in enumerate(data.columns):
@@ -1664,7 +1650,6 @@ def read(
             return data
 
         if (self._format_version >= 117) and (not self._value_labels_read):
-            self._can_read_value_labels = True
             self._read_strls()
 
         # Read data
@@ -1687,9 +1672,6 @@ def read(
         )
 
         self._lines_read += read_lines
-        if self._lines_read == self._nobs:
-            self._can_read_value_labels = True
-            self._data_read = True
         # if necessary, swap the byte order to native here
         if self._byteorder != self._native_byteorder:
             raw_data = raw_data.byteswap().view(raw_data.dtype.newbyteorder())