REF/CLN: Move private method

pandas/core/computation/expr.py

@@ -18,7 +18,6 @@
     UndefinedVariableError, _arith_ops_syms, _bool_ops_syms, _cmp_ops_syms,
     _mathops, _reductions, _unary_ops_syms, is_term)
 from pandas.core.computation.scope import Scope
-from pandas.core.reshape.util import compose
 
 import pandas.io.formats.printing as printing
 
@@ -103,8 +102,19 @@ def _replace_locals(tok):
     return toknum, tokval
 
 
-def _preparse(source, f=compose(_replace_locals, _replace_booleans,
-                                _rewrite_assign)):
+def _compose2(f, g):
+    """Compose 2 callables"""
+    return lambda *args, **kwargs: f(g(*args, **kwargs))
+
+
+def _compose(*funcs):
+    """Compose 2 or more callables"""
+    assert len(funcs) > 1, 'At least 2 callables must be passed to compose'
+    return reduce(_compose2, funcs)
+
+
+def _preparse(source, f=_compose(_replace_locals, _replace_booleans,
+                                 _rewrite_assign)):
     """Compose a collection of tokenization functions
 
     Parameters
@@ -701,8 +711,8 @@ def visitor(x, y):
 class PandasExprVisitor(BaseExprVisitor):
 
     def __init__(self, env, engine, parser,
-                 preparser=partial(_preparse, f=compose(_replace_locals,
-                                                        _replace_booleans))):
+                 preparser=partial(_preparse, f=_compose(_replace_locals,
+                                                         _replace_booleans))):
         super(PandasExprVisitor, self).__init__(env, engine, parser, preparser)
 
 

pandas/core/reshape/util.py

@@ -57,14 +57,3 @@ def cartesian_product(X):
     return [np.tile(np.repeat(np.asarray(com.values_from_object(x)), b[i]),
                     np.product(a[i]))
             for i, x in enumerate(X)]
-
-
-def _compose2(f, g):
-    """Compose 2 callables"""
-    return lambda *args, **kwargs: f(g(*args, **kwargs))
-
-
-def compose(*funcs):
-    """Compose 2 or more callables"""
-    assert len(funcs) > 1, 'At least 2 callables must be passed to compose'
-    return reduce(_compose2, funcs)