Removed raise_from_traceback (pandas-dev#29174)

Author: WillAyd

pandas/compat/__init__.py

@@ -37,16 +37,6 @@ def set_function_name(f, name, cls):
     return f
 
 
-def raise_with_traceback(exc, traceback=Ellipsis):
-    """
-    Raise exception with existing traceback.
-    If traceback is not passed, uses sys.exc_info() to get traceback.
-    """
-    if traceback == Ellipsis:
-        _, _, traceback = sys.exc_info()
-    raise exc.with_traceback(traceback)
-
-
 # https://github.com/pandas-dev/pandas/pull/9123
 def is_platform_little_endian():
     """ am I little endian """

pandas/core/frame.py

@@ -34,7 +34,7 @@
 from pandas._config import get_option
 
 from pandas._libs import algos as libalgos, lib
-from pandas.compat import PY36, raise_with_traceback
+from pandas.compat import PY36
 from pandas.compat.numpy import function as nv
 from pandas.util._decorators import (
     Appender,
@@ -485,7 +485,7 @@ def __init__(
                     "DataFrame constructor called with "
                     "incompatible data and dtype: {e}".format(e=e)
                 )
-                raise_with_traceback(exc)
+                raise exc from e
 
             if arr.ndim == 0 and index is not None and columns is not None:
                 values = cast_scalar_to_array(
@@ -7821,11 +7821,10 @@ def f(x):
                 elif filter_type == "bool":
                     data = self._get_bool_data()
                 else:  # pragma: no cover
-                    e = NotImplementedError(
+                    raise NotImplementedError(
                         "Handling exception with filter_type {f} not"
                         "implemented.".format(f=filter_type)
-                    )
-                    raise_with_traceback(e)
+                    ) from e
                 with np.errstate(all="ignore"):
                     result = f(data.values)
                 labels = data._get_agg_axis(axis)

pandas/core/internals/construction.py

@@ -9,7 +9,7 @@
 
 from pandas._libs import lib
 import pandas.compat as compat
-from pandas.compat import PY36, raise_with_traceback
+from pandas.compat import PY36
 
 from pandas.core.dtypes.cast import (
     construct_1d_arraylike_from_scalar,
@@ -164,11 +164,10 @@ def init_ndarray(values, index, columns, dtype=None, copy=False):
             try:
                 values = values.astype(dtype)
             except Exception as orig:
-                e = ValueError(
+                raise ValueError(
                     "failed to cast to '{dtype}' (Exception "
                     "was: {orig})".format(dtype=dtype, orig=orig)
-                )
-                raise_with_traceback(e)
+                ) from orig
 
     index, columns = _get_axes(*values.shape, index=index, columns=columns)
     values = values.T

pandas/io/html.py

@@ -9,7 +9,6 @@
 import os
 import re
 
-from pandas.compat import raise_with_traceback
 from pandas.compat._optional import import_optional_dependency
 from pandas.errors import AbstractMethodError, EmptyDataError
 
@@ -889,7 +888,6 @@ def _parse(flavor, io, match, attrs, encoding, displayed_only, **kwargs):
     flavor = _validate_flavor(flavor)
     compiled_match = re.compile(match)  # you can pass a compiled regex here
 
-    # hack around python 3 deleting the exception variable
     retained = None
     for flav in flavor:
         parser = _parser_dispatch(flav)
@@ -916,7 +914,7 @@ def _parse(flavor, io, match, attrs, encoding, displayed_only, **kwargs):
         else:
             break
     else:
-        raise_with_traceback(retained)
+        raise retained
 
     ret = []
     for table in tables:

pandas/io/sql.py

@@ -12,7 +12,6 @@
 import numpy as np
 
 import pandas._libs.lib as lib
-from pandas.compat import raise_with_traceback
 
 from pandas.core.dtypes.common import is_datetime64tz_dtype, is_dict_like, is_list_like
 from pandas.core.dtypes.dtypes import DatetimeTZDtype
@@ -1596,17 +1595,17 @@ def execute(self, *args, **kwargs):
         except Exception as exc:
             try:
                 self.con.rollback()
-            except Exception:  # pragma: no cover
+            except Exception as inner_exc:  # pragma: no cover
                 ex = DatabaseError(
                     "Execution failed on sql: {sql}\n{exc}\nunable "
                     "to rollback".format(sql=args[0], exc=exc)
                 )
-                raise_with_traceback(ex)
+                raise ex from inner_exc
 
             ex = DatabaseError(
                 "Execution failed on sql '{sql}': {exc}".format(sql=args[0], exc=exc)
             )
-            raise_with_traceback(ex)
+            raise ex from exc
 
     @staticmethod
     def _query_iterator(

pandas/tests/util/test_util.py

@@ -1,10 +1,8 @@
 import os
-import sys
 
 import pytest
 
 import pandas.compat as compat
-from pandas.compat import raise_with_traceback
 
 import pandas.util.testing as tm
 
@@ -34,23 +32,6 @@ def test_numpy_err_state_is_default():
     assert np.geterr() == expected
 
 
-def test_raise_with_traceback():
-    with pytest.raises(LookupError, match="error_text"):
-        try:
-            raise ValueError("THIS IS AN ERROR")
-        except ValueError:
-            e = LookupError("error_text")
-            raise_with_traceback(e)
-
-    with pytest.raises(LookupError, match="error_text"):
-        try:
-            raise ValueError("This is another error")
-        except ValueError:
-            e = LookupError("error_text")
-            _, _, traceback = sys.exc_info()
-            raise_with_traceback(e, traceback)
-
-
 def test_convert_rows_list_to_csv_str():
     rows_list = ["aaa", "bbb", "ccc"]
     ret = tm.convert_rows_list_to_csv_str(rows_list)
@@ -70,16 +51,6 @@ def test_create_temp_directory():
     assert not os.path.exists(path)
 
 
-def test_assert_raises_regex_deprecated():
-    # see gh-23592
-
-    with tm.assert_produces_warning(FutureWarning):
-        msg = "Not equal!"
-
-        with tm.assert_raises_regex(AssertionError, msg):
-            assert 1 == 2, msg
-
-
 @pytest.mark.parametrize("strict_data_files", [True, False])
 def test_datapath_missing(datapath):
     with pytest.raises(ValueError, match="Could not find file"):

pandas/util/testing.py

@@ -5,7 +5,6 @@
 from functools import wraps
 import gzip
 import os
-import re
 from shutil import rmtree
 import string
 import tempfile
@@ -23,7 +22,7 @@
 )
 
 import pandas._libs.testing as _testing
-from pandas.compat import _get_lzma_file, _import_lzma, raise_with_traceback
+from pandas.compat import _get_lzma_file, _import_lzma
 
 from pandas.core.dtypes.common import (
     is_bool,
@@ -2404,143 +2403,6 @@ def wrapper(*args, **kwargs):
 with_connectivity_check = network
 
 
-def assert_raises_regex(_exception, _regexp, _callable=None, *args, **kwargs):
-    r"""
-    Check that the specified Exception is raised and that the error message
-    matches a given regular expression pattern. This may be a regular
-    expression object or a string containing a regular expression suitable
-    for use by `re.search()`. This is a port of the `assertRaisesRegexp`
-    function from unittest in Python 2.7.
-
-    .. deprecated:: 0.24.0
-        Use `pytest.raises` instead.
-
-    Examples
-    --------
-    >>> assert_raises_regex(ValueError, 'invalid literal for.*XYZ', int, 'XYZ')
-    >>> import re
-    >>> assert_raises_regex(ValueError, re.compile('literal'), int, 'XYZ')
-
-    If an exception of a different type is raised, it bubbles up.
-
-    >>> assert_raises_regex(TypeError, 'literal', int, 'XYZ')
-    Traceback (most recent call last):
-        ...
-    ValueError: invalid literal for int() with base 10: 'XYZ'
-    >>> dct = dict()
-    >>> assert_raises_regex(KeyError, 'pear', dct.__getitem__, 'apple')
-    Traceback (most recent call last):
-        ...
-    AssertionError: "pear" does not match "'apple'"
-
-    You can also use this in a with statement.
-
-    >>> with assert_raises_regex(TypeError, r'unsupported operand type\(s\)'):
-    ...     1 + {}
-    >>> with assert_raises_regex(TypeError, 'banana'):
-    ...     'apple'[0] = 'b'
-    Traceback (most recent call last):
-        ...
-    AssertionError: "banana" does not match "'str' object does not support \
-item assignment"
-    """
-    warnings.warn(
-        (
-            "assert_raises_regex has been deprecated and will "
-            "be removed in the next release. Please use "
-            "`pytest.raises` instead."
-        ),
-        FutureWarning,
-        stacklevel=2,
-    )
-
-    manager = _AssertRaisesContextmanager(exception=_exception, regexp=_regexp)
-    if _callable is not None:
-        with manager:
-            _callable(*args, **kwargs)
-    else:
-        return manager
-
-
-class _AssertRaisesContextmanager:
-    """
-    Context manager behind `assert_raises_regex`.
-    """
-
-    def __init__(self, exception, regexp=None):
-        """
-        Initialize an _AssertRaisesContextManager instance.
-
-        Parameters
-        ----------
-        exception : class
-            The expected Exception class.
-        regexp : str, default None
-            The regex to compare against the Exception message.
-        """
-
-        self.exception = exception
-
-        if regexp is not None and not hasattr(regexp, "search"):
-            regexp = re.compile(regexp, re.DOTALL)
-
-        self.regexp = regexp
-
-    def __enter__(self):
-        return self
-
-    def __exit__(self, exc_type, exc_value, trace_back):
-        expected = self.exception
-
-        if not exc_type:
-            exp_name = getattr(expected, "__name__", str(expected))
-            raise AssertionError("{name} not raised.".format(name=exp_name))
-
-        return self.exception_matches(exc_type, exc_value, trace_back)
-
-    def exception_matches(self, exc_type, exc_value, trace_back):
-        """
-        Check that the Exception raised matches the expected Exception
-        and expected error message regular expression.
-
-        Parameters
-        ----------
-        exc_type : class
-            The type of Exception raised.
-        exc_value : Exception
-            The instance of `exc_type` raised.
-        trace_back : stack trace object
-            The traceback object associated with `exc_value`.
-
-        Returns
-        -------
-        is_matched : bool
-            Whether or not the Exception raised matches the expected
-            Exception class and expected error message regular expression.
-
-        Raises
-        ------
-        AssertionError : The error message provided does not match
-                         the expected error message regular expression.
-        """
-
-        if issubclass(exc_type, self.exception):
-            if self.regexp is not None:
-                val = str(exc_value)
-
-                if not self.regexp.search(val):
-                    msg = '"{pat}" does not match "{val}"'.format(
-                        pat=self.regexp.pattern, val=val
-                    )
-                    e = AssertionError(msg)
-                    raise_with_traceback(e, trace_back)
-
-            return True
-        else:
-            # Failed, so allow Exception to bubble up.
-            return False
-
-
 @contextmanager
 def assert_produces_warning(
     expected_warning=Warning,