Merge 4cfae7b into 2ba25c5

README.md

@@ -26,6 +26,10 @@ pip install datascience
 
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+### v0.12.1
+* Adds an `shallow` argument to `Table#select` to allow for shallow 
+copying of the table's data.
+
 ### v0.12.0
 * Changes `Table#scatter`'s argument name of `colors` to `group` to mirror `Table#hist`.
 * Makes a grouped scatterplot's legend identical to a group histogram's legend.

datascience/tables.py

@@ -596,12 +596,14 @@ def copy(self, *, shallow=False):
             self._add_column_and_format(table, label, column)
         return table
 
-    def select(self, *column_or_columns):
+    def select(self, *column_or_columns, shallow=False):
         """Return a table with only the columns in ``column_or_columns``.
 
         Args:
             ``column_or_columns``: Columns to select from the ``Table`` as
             either column labels (``str``) or column indices (``int``).
+            ''shallow'': Setting this to True will select columns without
+            making a copy of the column.
 
         Returns:
             A new instance of ``Table`` containing only selected columns.
@@ -644,7 +646,10 @@ def select(self, *column_or_columns):
         labels = self._varargs_as_labels(column_or_columns)
         table = type(self)()
         for label in labels:
-            self._add_column_and_format(table, label, np.copy(self[label]))
+            if shallow:
+                self._add_column_and_format(table, label, self[label])
+            else:
+                self._add_column_and_format(table, label, np.copy(self[label]))
         return table
 
     # These, along with a snippet below, are necessary for Sphinx to

datascience/version.py

@@ -1 +1 @@
-__version__ = '0.12.0'
+__version__ = '0.12.1'

tests/test_tables.py

@@ -155,6 +155,40 @@ def test_select(table):
     10     | 1
     """)
 
+def test_select_with_copy_values(table):
+    t = table.copy()
+    test = t.select(["points"], shallow=True)
+    test1 = t.select(["points"], shallow=False) #default setting
+    assert_equal(test, """
+    points
+    1      
+    2      
+    2      
+    10     
+    """)
+    t["points"][0] = 999
+    assert_equal(t.select("points"), """
+    points
+    999     
+    2      
+    2      
+    10     
+    """)
+    assert_equal(test, """
+    points
+    999     
+    2      
+    2      
+    10     
+    """)
+    assert_equal(test1, """
+    points 
+    1   
+    2      
+    2      
+    10     
+    """)
+
 def test_drop(table):
     t = table
     test = t.drop(['points', 1])