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compat.py
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# Copyright 2015 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""Functions for Python 2 vs. 3 compatibility.
## Conversion routines
In addition to the functions below, `as_str` converts an object to a `str`.
## Types
The compatibility module also provides the following types:
* `bytes_or_text_types`
* `complex_types`
* `integral_types`
* `real_types`
"""
from
__future__
import
absolute_import
from
__future__
import
division
from
__future__
import
print_function
import
numbers
as
_numbers
import
numpy
as
_np
import
six
as
_six
from
tensorflow
.
python
.
util
.
tf_export
import
tf_export
def
as_bytes
(
bytes_or_text
,
encoding
=
'utf-8'
):
"""Converts either bytes or unicode to `bytes`, using utf-8 encoding for text.
Args:
bytes_or_text: A `bytes`, `str`, or `unicode` object.
encoding: A string indicating the charset for encoding unicode.
Returns:
A `bytes` object.
Raises:
TypeError: If `bytes_or_text` is not a binary or unicode string.
"""
if
isinstance
(
bytes_or_text
,
_six
.
text_type
):
return
bytes_or_text
.
encode
(
encoding
)
elif
isinstance
(
bytes_or_text
,
bytes
):
return
bytes_or_text
else
:
raise
TypeError
(
'Expected binary or unicode string, got %r'
%
(
bytes_or_text
,))
def
as_text
(
bytes_or_text
,
encoding
=
'utf-8'
):
"""Returns the given argument as a unicode string.
Args:
bytes_or_text: A `bytes`, `str`, or `unicode` object.
encoding: A string indicating the charset for decoding unicode.
Returns:
A `unicode` (Python 2) or `str` (Python 3) object.
Raises:
TypeError: If `bytes_or_text` is not a binary or unicode string.
"""
if
isinstance
(
bytes_or_text
,
_six
.
text_type
):
return
bytes_or_text
elif
isinstance
(
bytes_or_text
,
bytes
):
return
bytes_or_text
.
decode
(
encoding
)
else
:
raise
TypeError
(
'Expected binary or unicode string, got %r'
%
bytes_or_text
)
# Convert an object to a `str` in both Python 2 and 3.
if
_six
.
PY2
:
as_str
=
as_bytes
tf_export
(
'compat.as_bytes'
,
'compat.as_str'
)(
as_bytes
)
tf_export
(
'compat.as_text'
)(
as_text
)
else
:
as_str
=
as_text
tf_export
(
'compat.as_bytes'
)(
as_bytes
)
tf_export
(
'compat.as_text'
,
'compat.as_str'
)(
as_text
)
@
tf_export
(
'compat.as_str_any'
)
def
as_str_any
(
value
):
"""Converts to `str` as `str(value)`, but use `as_str` for `bytes`.
Args:
value: A object that can be converted to `str`.
Returns:
A `str` object.
"""
if
isinstance
(
value
,
bytes
):
return
as_str
(
value
)
else
:
return
str
(
value
)
@
tf_export
(
'compat.path_to_str'
)
def
path_to_str
(
path
):
"""Returns the file system path representation of a `PathLike` object, else as it is.
Args:
path: An object that can be converted to path representation.
Returns:
A `str` object.
"""
if
hasattr
(
path
,
'__fspath__'
):
path
=
as_str_any
(
path
.
__fspath__
())
return
path
# Numpy 1.8 scalars don't inherit from numbers.Integral in Python 3, so we
# need to check them specifically. The same goes from Real and Complex.
integral_types
=
(
_numbers
.
Integral
,
_np
.
integer
)
tf_export
(
'compat.integral_types'
).
export_constant
(
__name__
,
'integral_types'
)
real_types
=
(
_numbers
.
Real
,
_np
.
integer
,
_np
.
floating
)
tf_export
(
'compat.real_types'
).
export_constant
(
__name__
,
'real_types'
)
complex_types
=
(
_numbers
.
Complex
,
_np
.
number
)
tf_export
(
'compat.complex_types'
).
export_constant
(
__name__
,
'complex_types'
)
# Either bytes or text.
bytes_or_text_types
=
(
bytes
,
_six
.
text_type
)
tf_export
(
'compat.bytes_or_text_types'
).
export_constant
(
__name__
,
'bytes_or_text_types'
)
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