With a function that creates a ragged array:
In [60]: def foo():
...: print('one')
...: x = np.array([[1],[1,2]])
...: return x
...:
In [61]: foo()
one
/usr/local/bin/ipython3:3: VisibleDeprecationWarning: Creating an ndarray from ragged nested sequences (which is a list-or-tuple of lists-or-tuples-or ndarrays with different lengths or shapes) is deprecated. If you meant to do this, you must specify 'dtype=object' when creating the ndarray
# -*- coding: utf-8 -*-
Out[61]: array([list([1]), list([1, 2])], dtype=object)
I get the warning, but also the expected result.
I can control the warnings.
For example to turn if off:
In [68]: np.warnings.filterwarnings('ignore', category=np.VisibleDeprecationWarning)
In [69]: foo()
one
Out[69]: array([list([1]), list([1, 2])], dtype=object)
Or to raise an error:
In [70]: np.warnings.filterwarnings('error', category=np.VisibleDeprecationWarning)
In [71]: foo()
one
---------------------------------------------------------------------------
VisibleDeprecationWarning Traceback (most recent call last)
<ipython-input-71-c19b6d9633cf> in <module>
----> 1 foo()
<ipython-input-60-6ad21d9e07b4> in foo()
1 def foo():
2 print('one')
----> 3 x = np.array([[1],[1,2]])
4 return x
5
VisibleDeprecationWarning: Creating an ndarray from ragged nested sequences (which is a list-or-tuple of lists-or-tuples-or ndarrays with different lengths or shapes) is deprecated. If you meant to do this, you must specify 'dtype=object' when creating the ndarray
The error gives a traceback telling me where the warning was raised.
There may be ways of refining the warning filter to catch just this one, and not others of the same category. I haven’t used this mechanism much.
Read np.warnings.filterwarnings docs for more details.