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| author | Marten van Kerkwijk <mhvk@astro.utoronto.ca> | 2019-05-27 21:40:07 -0400 |
|---|---|---|
| committer | Marten van Kerkwijk <mhvk@astro.utoronto.ca> | 2019-06-12 14:48:30 -0400 |
| commit | e12c6bda05c8b8c024f04f2d41416e5e63971b3e (patch) | |
| tree | a34cb770b014957b80b61e9d8b105382422bdf86 /numpy/core/multiarray.py | |
| parent | 90ee55557537f5fc2f02cca57f43f8494a5c497d (diff) | |
| download | numpy-e12c6bda05c8b8c024f04f2d41416e5e63971b3e.tar.gz | |
BUG: ensure that casting to/from structured is properly checked.
Allow unsafe casting from a simple data type to a structured one with
multiple fields, but only from structured data type with a single
field (checked recursively) to a simple data type.
For now, continue to allow any structured to structured with
casting="unsafe", as the current can_cast implementation does not
match that of "astype".
Diffstat (limited to 'numpy/core/multiarray.py')
| -rw-r--r-- | numpy/core/multiarray.py | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/numpy/core/multiarray.py b/numpy/core/multiarray.py index 8006dd9b5..118562c89 100644 --- a/numpy/core/multiarray.py +++ b/numpy/core/multiarray.py @@ -496,11 +496,15 @@ def can_cast(from_, to, casting=None): Notes ----- - Starting in NumPy 1.9, can_cast function now returns False in 'safe' - casting mode for integer/float dtype and string dtype if the string dtype - length is not long enough to store the max integer/float value converted - to a string. Previously can_cast in 'safe' mode returned True for - integer/float dtype and a string dtype of any length. + .. versionchanged:: 1.17.0 + Casting between a simple data type and a structured one is possible only + for "unsafe" casting. Casting to multiple fields is allowed, but + casting from multiple fields is not. + + .. versionchanged:: 1.9.0 + Casting from numeric to string types in 'safe' casting mode requires + that the string dtype length is long enough to store the maximum + integer/float value converted. See also -------- |