old_contents: 
  __all__ = ['plot']
  
  # magic string indicating DF columns holding conf bound values
  CONF_COLUMN = '_conf'
  
  def plot(Si_df, ax=None):
      '''Create bar chart of results
  
      Parameters
      ----------
      * Si_df: pd.DataFrame, of sensitivity results
  
      Returns
      ----------
      * ax : matplotlib axes object
  
      Examples
      ----------
      >>> from SALib.plotting.bar import plot as barplot
      >>> from SALib.test_functions import Ishigami
      >>>
      >>> X = saltelli.sample(problem, 1000)
      >>> Y = Ishigami.evaluate(X)
      >>> Si = sobol.analyze(problem, Y, print_to_console=False)
      >>> Si_df = Si.to_df()
      >>> barplot(Si_df)
      '''
      conf_cols = Si_df.columns.str.contains(CONF_COLUMN)
  
      confs = Si_df.loc[:, conf_cols]
      confs.columns = [c.replace(CONF_COLUMN, '') for c in confs.columns]
  
      Sis = Si_df.loc[:, ~conf_cols]
  
      ax = Sis.plot(kind='bar', yerr=confs, ax=ax)
      return ax
new_contents: 
  __all__ = ['plot']
  
  # magic string indicating DF columns holding conf bound values
  CONF_COLUMN = '_conf'
  
  def plot(Si_df, ax=None):
      '''Create bar chart of results
  
      Parameters
      ----------
      * Si_df: pd.DataFrame, of sensitivity results
  
      Returns
      ----------
      * ax : matplotlib axes object
  
      Examples
      ----------
          >>> from SALib.plotting.bar import plot as barplot
          >>> from SALib.test_functions import Ishigami
          >>>
          >>> X = saltelli.sample(problem, 1000)
          >>> Y = Ishigami.evaluate(X)
          >>> Si = sobol.analyze(problem, Y, print_to_console=False)
          >>> Si_df = Si.to_df()
          >>> barplot(Si_df)
      '''
      conf_cols = Si_df.columns.str.contains(CONF_COLUMN)
  
      confs = Si_df.loc[:, conf_cols]
      confs.columns = [c.replace(CONF_COLUMN, '') for c in confs.columns]
  
      Sis = Si_df.loc[:, ~conf_cols]
  
      ax = Sis.plot(kind='bar', yerr=confs, ax=ax)
      return ax
subject: Make docstring appear nicely