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