parameters: (self, freq=None, how='start', copy=True)
return_statement: return self._constructor(new_values,
                                   index=new_index).__finalize__(self)
docstring: Cast to datetimeindex of timestamps, at *beginning* of period.
  
          Parameters
          ----------
          freq : string, default frequency of PeriodIndex
              Desired frequency
          how : {'s', 'e', 'start', 'end'}
              Convention for converting period to timestamp; start of period
              vs. end
  
          Returns
          -------
          ts : Series with DatetimeIndex
docstring_summary: Cast to datetimeindex of timestamps, at *beginning* of period.
docstring_tokens: Cast to datetimeindex of timestamps at * beginning * of period .
function: def to_timestamp(self, freq=None, how='start', copy=True):
          """
          Cast to datetimeindex of timestamps, at *beginning* of period.
  
          Parameters
          ----------
          freq : string, default frequency of PeriodIndex
              Desired frequency
          how : {'s', 'e', 'start', 'end'}
              Convention for converting period to timestamp; start of period
              vs. end
  
          Returns
          -------
          ts : Series with DatetimeIndex
          """
          new_values = self._values
          if copy:
              new_values = new_values.copy()
  
          new_index = self.index.to_timestamp(freq=freq, how=how)
          return self._constructor(new_values,
                                   index=new_index).__finalize__(self)
function_tokens: def to_timestamp ( self , freq = None , how = 'start' , copy = True ) : new_values = self . _values if copy : new_values = new_values . copy ( ) new_index = self . index . to_timestamp ( freq = freq , how = how ) return self . _constructor ( new_values , index = new_index ) . __finalize__ ( self )