code: def atleast_2d_column_default(a, preserve_pandas=False):
      if preserve_pandas and have_pandas:
          if isinstance(a, pandas.Series):
              return pandas.DataFrame(a)
          elif isinstance(a, pandas.DataFrame):
              return a
          # fall through
      a = np.asarray(a)
      a = np.atleast_1d(a)
      if a.ndim <= 1:
          a = a.reshape((-1, 1))
      assert a.ndim >= 2
      return a
  
imports: import sys
  import numpy
  import six
  from six.moves import cStringIO
  from .compat import optional_dep_ok
label_desc: Use image node_id 3 for calling a global function with example usage: atleast_2d_column_default(a, preserve_pandas) and returns: a, pandas, a