cleanup inconsistently used imports

ci/lint.sh

@@ -91,6 +91,15 @@ if [ "$LINT" ]; then
     fi
     echo "Check for invalid testing DONE"
 
+    # Check for imports from pandas.core.common instead
+    # of `import pandas.core.common as com`
+    echo "Check for non-standard imports"
+    grep -R --include="*.py*" -E "from pandas.core.common import " pandas
+    if [ $? = "0" ]; then
+        RET=1
+    fi
+    echo "Check for non-standard imports DONE"
+
     echo "Check for use of lists instead of generators in built-in Python functions"
 
     # Example: Avoid `any([i for i in some_iterator])` in favor of `any(i for i in some_iterator)`

pandas/core/base.py

@@ -24,7 +24,6 @@
 from pandas.compat import PYPY
 from pandas.util._decorators import (Appender, cache_readonly,
                                      deprecate_kwarg, Substitution)
-from pandas.core.common import AbstractMethodError, _maybe_box_datetimelike
 
 from pandas.core.accessor import DirNamesMixin
 
@@ -46,7 +45,7 @@ class StringMixin(object):
     # Formatting
 
     def __unicode__(self):
-        raise AbstractMethodError(self)
+        raise com.AbstractMethodError(self)
 
     def __str__(self):
         """
@@ -278,10 +277,10 @@ def _gotitem(self, key, ndim, subset=None):
             subset to act on
 
         """
-        raise AbstractMethodError(self)
+        raise com.AbstractMethodError(self)
 
     def aggregate(self, func, *args, **kwargs):
-        raise AbstractMethodError(self)
+        raise com.AbstractMethodError(self)
 
     agg = aggregate
 
@@ -815,7 +814,7 @@ def tolist(self):
         """
 
         if is_datetimelike(self):
-            return [_maybe_box_datetimelike(x) for x in self._values]
+            return [com._maybe_box_datetimelike(x) for x in self._values]
         else:
             return self._values.tolist()
 
@@ -1238,4 +1237,4 @@ def duplicated(self, keep='first'):
     # abstracts
 
     def _update_inplace(self, result, **kwargs):
-        raise AbstractMethodError(self)
+        raise com.AbstractMethodError(self)

pandas/core/categorical.py

@@ -28,7 +28,6 @@
     is_list_like, is_sequence,
     is_scalar,
     is_dict_like)
-from pandas.core.common import is_null_slice, _maybe_box_datetimelike
 
 from pandas.core.algorithms import factorize, take_1d, unique1d
 from pandas.core.accessor import PandasDelegate
@@ -468,7 +467,7 @@ def tolist(self):
         (for Timestamp/Timedelta/Interval/Period)
         """
         if is_datetimelike(self.categories):
-            return [_maybe_box_datetimelike(x) for x in self]
+            return [com._maybe_box_datetimelike(x) for x in self]
         return np.array(self).tolist()
 
     @property
@@ -1686,7 +1685,7 @@ def _slice(self, slicer):
         # only allow 1 dimensional slicing, but can
         # in a 2-d case be passd (slice(None),....)
         if isinstance(slicer, tuple) and len(slicer) == 2:
-            if not is_null_slice(slicer[0]):
+            if not com.is_null_slice(slicer[0]):
                 raise AssertionError("invalid slicing for a 1-ndim "
                                      "categorical")
             slicer = slicer[1]
@@ -1847,7 +1846,7 @@ def __setitem__(self, key, value):
             # only allow 1 dimensional slicing, but can
             # in a 2-d case be passd (slice(None),....)
             if len(key) == 2:
-                if not is_null_slice(key[0]):
+                if not com.is_null_slice(key[0]):
                     raise AssertionError("invalid slicing for a 1-ndim "
                                          "categorical")
                 key = key[1]

pandas/core/computation/align.py

@@ -10,7 +10,9 @@
 import pandas as pd
 from pandas import compat
 from pandas.errors import PerformanceWarning
-from pandas.core.common import flatten
+
+import pandas.core.common as com
+
 from pandas.core.computation.common import _result_type_many
 
 
@@ -117,7 +119,7 @@ def _align(terms):
     """Align a set of terms"""
     try:
         # flatten the parse tree (a nested list, really)
-        terms = list(flatten(terms))
+        terms = list(com.flatten(terms))
     except TypeError:
         # can't iterate so it must just be a constant or single variable
         if isinstance(terms.value, pd.core.generic.NDFrame):

pandas/core/computation/expressions.py

@@ -8,7 +8,9 @@
 
 import warnings
 import numpy as np
-from pandas.core.common import _values_from_object
+
+import pandas.core.common as com
+
 from pandas.core.computation.check import _NUMEXPR_INSTALLED
 from pandas.core.config import get_option
 
@@ -122,8 +124,8 @@ def _evaluate_numexpr(op, op_str, a, b, truediv=True,
 
 
 def _where_standard(cond, a, b):
-    return np.where(_values_from_object(cond), _values_from_object(a),
-                    _values_from_object(b))
+    return np.where(com._values_from_object(cond), com._values_from_object(a),
+                    com._values_from_object(b))
 
 
 def _where_numexpr(cond, a, b):

pandas/core/frame.py

@@ -62,12 +62,6 @@
 from pandas.core.dtypes.missing import isna, notna
 
 
-from pandas.core.common import (_try_sort,
-                                _default_index,
-                                _values_from_object,
-                                _maybe_box_datetimelike,
-                                _dict_compat,
-                                standardize_mapping)
 from pandas.core.generic import NDFrame, _shared_docs
 from pandas.core.index import (Index, MultiIndex, _ensure_index,
                                _ensure_index_from_sequences)
@@ -387,9 +381,9 @@ def __init__(self, data=None, index=None, columns=None, dtype=None,
                         if isinstance(data[0], Series):
                             index = _get_names_from_index(data)
                         elif isinstance(data[0], Categorical):
-                            index = _default_index(len(data[0]))
+                            index = com._default_index(len(data[0]))
                         else:
-                            index = _default_index(len(data))
+                            index = com._default_index(len(data))
 
                     mgr = _arrays_to_mgr(arrays, columns, index, columns,
                                          dtype=dtype)
@@ -466,7 +460,7 @@ def _init_dict(self, data, index, columns, dtype=None):
         else:
             keys = list(data.keys())
             if not isinstance(data, OrderedDict):
-                keys = _try_sort(keys)
+                keys = com._try_sort(keys)
             columns = data_names = Index(keys)
             arrays = [data[k] for k in keys]
 
@@ -493,12 +487,12 @@ def _get_axes(N, K, index=index, columns=columns):
             # return axes or defaults
 
             if index is None:
-                index = _default_index(N)
+                index = com._default_index(N)
             else:
                 index = _ensure_index(index)
 
             if columns is None:
-                columns = _default_index(K)
+                columns = com._default_index(K)
             else:
                 columns = _ensure_index(columns)
             return index, columns
@@ -990,7 +984,7 @@ def to_dict(self, orient='dict', into=dict):
                           "columns will be omitted.", UserWarning,
                           stacklevel=2)
         # GH16122
-        into_c = standardize_mapping(into)
+        into_c = com.standardize_mapping(into)
         if orient.lower().startswith('d'):
             return into_c(
                 (k, v.to_dict(into)) for k, v in compat.iteritems(self))
@@ -1000,13 +994,13 @@ def to_dict(self, orient='dict', into=dict):
             return into_c((('index', self.index.tolist()),
                            ('columns', self.columns.tolist()),
                            ('data', lib.map_infer(self.values.ravel(),
-                                                  _maybe_box_datetimelike)
+                                                  com._maybe_box_datetimelike)
                             .reshape(self.values.shape).tolist())))
         elif orient.lower().startswith('s'):
-            return into_c((k, _maybe_box_datetimelike(v))
+            return into_c((k, com._maybe_box_datetimelike(v))
                           for k, v in compat.iteritems(self))
         elif orient.lower().startswith('r'):
-            return [into_c((k, _maybe_box_datetimelike(v))
+            return [into_c((k, com._maybe_box_datetimelike(v))
                            for k, v in zip(self.columns, np.atleast_1d(row)))
                     for row in self.values]
         elif orient.lower().startswith('i'):
@@ -1947,30 +1941,28 @@ def transpose(self, *args, **kwargs):
 
     # legacy pickle formats
     def _unpickle_frame_compat(self, state):  # pragma: no cover
-        from pandas.core.common import _unpickle_array
         if len(state) == 2:  # pragma: no cover
             series, idx = state
             columns = sorted(series)
         else:
             series, cols, idx = state
-            columns = _unpickle_array(cols)
+            columns = com._unpickle_array(cols)
 
-        index = _unpickle_array(idx)
+        index = com._unpickle_array(idx)
         self._data = self._init_dict(series, index, columns, None)
 
     def _unpickle_matrix_compat(self, state):  # pragma: no cover
-        from pandas.core.common import _unpickle_array
         # old unpickling
         (vals, idx, cols), object_state = state
 
-        index = _unpickle_array(idx)
-        dm = DataFrame(vals, index=index, columns=_unpickle_array(cols),
+        index = com._unpickle_array(idx)
+        dm = DataFrame(vals, index=index, columns=com._unpickle_array(cols),
                        copy=False)
 
         if object_state is not None:
             ovals, _, ocols = object_state
             objects = DataFrame(ovals, index=index,
-                                columns=_unpickle_array(ocols), copy=False)
+                                columns=com._unpickle_array(ocols), copy=False)
 
             dm = dm.join(objects)
 
@@ -2006,7 +1998,7 @@ def _get_value(self, index, col, takeable=False):
 
         if takeable:
             series = self._iget_item_cache(col)
-            return _maybe_box_datetimelike(series._values[index])
+            return com._maybe_box_datetimelike(series._values[index])
 
         series = self._get_item_cache(col)
         engine = self.index._engine
@@ -3371,7 +3363,7 @@ def _maybe_casted_values(index, labels=None):
                             values, mask, np.nan)
             return values
 
-        new_index = _default_index(len(new_obj))
+        new_index = com._default_index(len(new_obj))
         if level is not None:
             if not isinstance(level, (tuple, list)):
                 level = [level]
@@ -6084,7 +6076,7 @@ def extract_index(data):
                            (lengths[0], len(index)))
                     raise ValueError(msg)
             else:
-                index = _default_index(lengths[0])
+                index = com._default_index(lengths[0])
 
     return _ensure_index(index)
 
@@ -6155,7 +6147,7 @@ def _to_arrays(data, columns, coerce_float=False, dtype=None):
                                          dtype=dtype)
     elif isinstance(data[0], Categorical):
         if columns is None:
-            columns = _default_index(len(data))
+            columns = com._default_index(len(data))
         return data, columns
     elif (isinstance(data, (np.ndarray, Series, Index)) and
           data.dtype.names is not None):
@@ -6179,7 +6171,7 @@ def _masked_rec_array_to_mgr(data, index, columns, dtype, copy):
     if index is None:
         index = _get_names_from_index(fdata)
         if index is None:
-            index = _default_index(len(data))
+            index = com._default_index(len(data))
     index = _ensure_index(index)
 
     if columns is not None:
@@ -6239,14 +6231,14 @@ def _list_of_series_to_arrays(data, columns, coerce_float=False, dtype=None):
     for s in data:
         index = getattr(s, 'index', None)
         if index is None:
-            index = _default_index(len(s))
+            index = com._default_index(len(s))
 
         if id(index) in indexer_cache:
             indexer = indexer_cache[id(index)]
         else:
             indexer = indexer_cache[id(index)] = index.get_indexer(columns)
 
-        values = _values_from_object(s)
+        values = com._values_from_object(s)
         aligned_values.append(algorithms.take_1d(values, indexer))
 
     values = np.vstack(aligned_values)
@@ -6276,7 +6268,7 @@ def _list_of_dict_to_arrays(data, columns, coerce_float=False, dtype=None):
 
 def _convert_object_array(content, columns, coerce_float=False, dtype=None):
     if columns is None:
-        columns = _default_index(len(content))
+        columns = com._default_index(len(content))
     else:
         if len(columns) != len(content):  # pragma: no cover
             # caller's responsibility to check for this...
@@ -6298,7 +6290,7 @@ def convert(arr):
 def _get_names_from_index(data):
     has_some_name = any(getattr(s, 'name', None) is not None for s in data)
     if not has_some_name:
-        return _default_index(len(data))
+        return com._default_index(len(data))
 
     index = lrange(len(data))
     count = 0
@@ -6333,7 +6325,7 @@ def _homogenize(data, index, dtype=None):
                     oindex = index.astype('O')
 
                 if isinstance(index, (DatetimeIndex, TimedeltaIndex)):
-                    v = _dict_compat(v)
+                    v = com._dict_compat(v)
                 else:
                     v = dict(v)
                 v = lib.fast_multiget(v, oindex.values, default=np.nan)