def _astype_nansafe(arr, dtype, copy=True):
""" return a view if copy is False, but
need to be very careful as the result shape could change! """
if not isinstance(dtype, np.dtype):
dtype = _coerce_to_dtype(dtype)
if issubclass(dtype.type, text_type):
# in Py3 that's str, in Py2 that's unicode
return lib.astype_unicode(arr.ravel()).reshape(arr.shape)
elif issubclass(dtype.type, string_types):
return lib.astype_str(arr.ravel()).reshape(arr.shape)
elif is_datetime64_dtype(arr):
if dtype == object:
return tslib.ints_to_pydatetime(arr.view(np.int64))
elif dtype == np.int64:
return arr.view(dtype)
elif dtype != _NS_DTYPE:
raise TypeError("cannot astype a datetimelike from [%s] to [%s]" %
(arr.dtype, dtype))
return arr.astype(_NS_DTYPE)
elif is_timedelta64_dtype(arr):
if dtype == np.int64:
return arr.view(dtype)
elif dtype == object:
return tslib.ints_to_pytimedelta(arr.view(np.int64))
# in py3, timedelta64[ns] are int64
elif ((PY3 and dtype not in [_INT64_DTYPE, _TD_DTYPE])
or (not PY3 and dtype != _TD_DTYPE)):
# allow frequency conversions
if dtype.kind == 'm':
mask = isnull(arr)
result = arr.astype(dtype).astype(np.float64)
result[mask] = np.nan
return result
raise TypeError("cannot astype a timedelta from [%s] to [%s]" %
(arr.dtype, dtype))
return arr.astype(_TD_DTYPE)
elif (np.issubdtype(arr.dtype, np.floating)
and np.issubdtype(dtype, np.integer)):
if not np.isfinite(arr).all():
raise ValueError('Cannot convert non-finite values (NA or inf) to '
'integer')
elif arr.dtype == np.object_ and np.issubdtype(dtype.type, np.integer):
# work around NumPy brokenness, #1987
return lib.astype_intsafe(arr.ravel(), dtype).reshape(arr.shape)
if copy:
return arr.astype(dtype)
return arr.view(dtype)
def _astype_nansafe(arr, dtype, copy=True):
""" return a view if copy is False, but
need to be very careful as the result shape could change! """
if not isinstance(dtype, np.dtype):
dtype = _coerce_to_dtype(dtype)
if issubclass(dtype.type, text_type):
# in Py3 that's str, in Py2 that's unicode
return lib.astype_unicode(arr.ravel()).reshape(arr.shape)
elif issubclass(dtype.type, string_types):
return lib.astype_str(arr.ravel()).reshape(arr.shape)
elif is_datetime64_dtype(arr):
if dtype == object:
return tslib.ints_to_pydatetime(arr.view(np.int64))
elif dtype == np.int64:
return arr.view(dtype)
elif dtype != _NS_DTYPE:
raise TypeError("cannot astype a datetimelike from [%s] to [%s]" %
(arr.dtype, dtype))
return arr.astype(_NS_DTYPE)
elif is_timedelta64_dtype(arr):
if dtype == np.int64:
return arr.view(dtype)
elif dtype == object:
return tslib.ints_to_pytimedelta(arr.view(np.int64))
# in py3, timedelta64[ns] are int64
elif ((PY3 and dtype not in [_INT64_DTYPE, _TD_DTYPE]) or
(not PY3 and dtype != _TD_DTYPE)):
# allow frequency conversions
if dtype.kind == 'm':
mask = isnull(arr)
result = arr.astype(dtype).astype(np.float64)
result[mask] = np.nan
return result
raise TypeError("cannot astype a timedelta from [%s] to [%s]" %
(arr.dtype, dtype))
return arr.astype(_TD_DTYPE)
elif (np.issubdtype(arr.dtype, np.floating) and
np.issubdtype(dtype, np.integer)):
if not np.isfinite(arr).all():
raise ValueError('Cannot convert non-finite values (NA or inf) to '
'integer')
elif arr.dtype == np.object_ and np.issubdtype(dtype.type, np.integer):
# work around NumPy brokenness, #1987
return lib.astype_intsafe(arr.ravel(), dtype).reshape(arr.shape)
if copy:
return arr.astype(dtype)
return arr.view(dtype)