理解common.count_not_none()||dedent||zsqrt

• 源代码

  From ExponentialMovingWindow:

  _agg_see_also_doc = dedent(
      """
      See Also
      --------
      pandas.DataFrame.rolling.aggregate
      """
  )
  
  @doc(
      _shared_docs["aggregate"],
      see_also=_agg_see_also_doc,
      examples=_agg_examples_doc,
      versionadded="",
      klass="Series/Dataframe",
      axis="",
  )
  def std():
      return zsqrt(...)
  
  

• common

  pandas/core/common.py

  def count_not_none(*args) -> int:
  	"""
  	Returns the count of arguments that are not None
  	"""
  	return sum(x is not None for x in args)
  

  From official API reference, cann’t find an explaination about the module of common.py. I think it is commonly used by the core develop, but it is really usefull.

  Just like the header explaination :

  """
  Misc tools for implementing data structures
  Note : pandas.core.common is 'not' part of the public API
  """
  

  pandas/core/window/common.py

  It is common utility functions for rolling oprations.

  def zsqrt(x):
      with np.errstate(all="ignore"):
          result = np.sqrt(x)
          mask = x < 0
      if isinstance(x, ABCDataFrame):
          if mask._values.any():
              result[mask] = 0
      else:
          if mask.any():
              result[mask] = 0
      return result
  

• From textwrap import dedent

  textwrap.py module provides some convenience functions, as well as TextWrapper, the class that does all the work.

  textwrap.dedent(text)

  Remove any common leanding whitespace from every line in text.

  This can be used to make triple-quoted string line up with the left edge of the display, while still presenting them in the source code in indented form

• from pandas.util._decorators import Appender, Substitution,

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