title: Python warning :FutureWarning: Support for multi-dimensional indexing
body: <p>I am getting below warning for python in console.I did not found any solution for these.We dont want to suppress warnings .
  Also we have a big code base setup.how to know which code block is cause of this error as warning dont give code line number.
  I am using below version of python and numpy.Is it due to old verison's of python and numpy.</p>
  <p>Python version- 3.6.8
  Numpy Version-  1.19.5
  matplotlib version is 3.3.4
  pandas version is 1.1.5</p>
  <p>Warning:</p>
  <p>/python3.6/site-packages/matplotlib/cbook/<strong>init</strong>.py:1402: FutureWarning: Support for multi-dimensional indexing (e.g. <code>obj[:, None]</code>) is deprecated and will be removed in a future version.  Convert to a numpy array before indexing instead.</p>
  <p>python3.6/site-packages/pandas/core/indexing.py:1743: SettingWithCopyWarning:
  A value is trying to be set on a copy of a slice from a DataFrame.
  Try using .loc[row_indexer,col_indexer] = value instead</p>