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compat.py
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237 lines (195 loc) · 6.47 KB
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# Copyright (c) 2018 PaddlePaddle 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.
import six
import math
__all__ = [
'long_type',
'to_text',
'to_bytes',
'round',
'floor_division',
'get_exception_message',
]
if six.PY2:
int_type = int
long_type = long
else:
int_type = int
long_type = int
# str and bytes related functions
def to_text(obj, encoding='utf-8', inplace=False):
"""
All string in PaddlePaddle should be represented as a literal string.
This function will convert object to a literal string without any encoding.
Especially, if the object type is a list or set container, we will iterate
all items in the object and convert them to literal string.
In Python3:
Decode the bytes type object to str type with specific encoding
In Python2:
Decode the str type object to unicode type with specific encoding
Args:
obj(unicode|str|bytes|list|set) : The object to be decoded.
encoding(str) : The encoding format to decode a string
inplace(bool) : If we change the original object or we create a new one
Returns:
Decoded result of obj
"""
if obj is None:
return obj
if isinstance(obj, list):
if inplace:
for i in six.moves.xrange(len(obj)):
obj[i] = _to_text(obj[i], encoding)
return obj
else:
return [_to_text(item, encoding) for item in obj]
elif isinstance(obj, set):
if inplace:
for item in obj:
obj.remove(item)
obj.add(_to_text(item, encoding))
return obj
else:
return set([_to_text(item, encoding) for item in obj])
else:
return _to_text(obj, encoding)
def _to_text(obj, encoding):
"""
In Python3:
Decode the bytes type object to str type with specific encoding
In Python2:
Decode the str type object to unicode type with specific encoding,
or we just return the unicode string of object
Args:
obj(unicode|str|bytes) : The object to be decoded.
encoding(str) : The encoding format
Returns:
decoded result of obj
"""
if obj is None:
return obj
if isinstance(obj, six.binary_type):
return obj.decode(encoding)
elif isinstance(obj, six.text_type):
return obj
else:
return six.u(obj)
def to_bytes(obj, encoding='utf-8', inplace=False):
"""
All string in PaddlePaddle should be represented as a literal string.
This function will convert object to a bytes with specific encoding.
Especially, if the object type is a list or set container, we will iterate
all items in the object and convert them to bytes.
In Python3:
Encode the str type object to bytes type with specific encoding
In Python2:
Encode the unicode type object to str type with specific encoding,
or we just return the 8-bit string of object
Args:
obj(unicode|str|bytes|list|set) : The object to be encoded.
encoding(str) : The encoding format to encode a string
inplace(bool) : If we change the original object or we create a new one
Returns:
Decoded result of obj
"""
if obj is None:
return obj
if isinstance(obj, list):
if inplace:
for i in six.moves.xrange(len(obj)):
obj[i] = _to_bytes(obj[i], encoding)
return obj
else:
return [_to_bytes(item, encoding) for item in obj]
elif isinstance(obj, set):
if inplace:
for item in obj:
obj.remove(item)
obj.add(_to_bytes(item, encoding))
return obj
else:
return set([_to_bytes(item, encoding) for item in obj])
else:
return _to_bytes(obj, encoding)
def _to_bytes(obj, encoding):
"""
In Python3:
Encode the str type object to bytes type with specific encoding
In Python2:
Encode the unicode type object to str type with specific encoding,
or we just return the 8-bit string of object
Args:
obj(unicode|str|bytes) : The object to be encoded.
encoding(str) : The encoding format
Returns:
encoded result of obj
"""
if obj is None:
return obj
assert encoding is not None
if isinstance(obj, six.text_type):
return obj.encode(encoding)
elif isinstance(obj, six.binary_type):
return obj
else:
return six.b(obj)
# math related functions
def round(x, d=0):
"""
Compatible round which act the same behaviour in Python3.
Args:
x(float) : The number to round halfway.
Returns:
round result of x
"""
if six.PY3:
# The official walkaround of round in Python3 is incorrect
# we implement accroding this answer: https://www.techforgeek.info/round_python.html
if x > 0.0:
p = 10**d
return float(math.floor((x * p) + math.copysign(0.5, x))) / p
elif x < 0.0:
p = 10**d
return float(math.ceil((x * p) + math.copysign(0.5, x))) / p
else:
return math.copysign(0.0, x)
else:
import __builtin__
return __builtin__.round(x, d)
def floor_division(x, y):
"""
Compatible division which act the same behaviour in Python3 and Python2,
whose result will be a int value of floor(x / y) in Python3 and value of
(x / y) in Python2.
Args:
x(int|float) : The number to divide.
y(int|float) : The number to be divided
Returns:
division result of x // y
"""
return x // y
# exception related functions
def get_exception_message(exc):
"""
Get the error message of a specific exception
Args:
exec(Exception) : The exception to get error message.
Returns:
the error message of exec
"""
assert exc is not None
if six.PY2:
return exc.message
else:
return str(exc)