effectivepython/example_code/item_21_example_11.py at master · AISTLAB/effectivepython · GitHub

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#!/usr/bin/env python2.7

# 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.

# Preamble to mimick book environment

import logging

from pprint import pprint

from sys import stdout as STDOUT

# Example 11

def safe_division_d(number, divisor, **kwargs):

ignore_overflow = kwargs.pop('ignore_overflow', False)

ignore_zero_div = kwargs.pop('ignore_zero_division', False)

if kwargs:

raise TypeError('Unexpected **kwargs: %r' % kwargs)

try:

return number / divisor

except OverflowError:

if ignore_overflow:

return 0

else:

raise

except ZeroDivisionError:

if ignore_zero_div:

return float('inf')

else:

raise

assert safe_division_d(1.0, 10) == 0.1

assert safe_division_d(1.0, 0, ignore_zero_division=True) == float('inf')

assert safe_division_d(1.0, 10**500, ignore_overflow=True) is 0

# Example 12

try:

safe_division_d(1.0, 0, False, True)

except:

logging.exception('Expected')

else:

assert False

# Example 13

try:

safe_division_d(0.0, 0, unexpected=True)

except:

logging.exception('Expected')

else:

assert False

effectivepython/example_code/item_21_example_11.py at master · AISTLAB/effectivepython · GitHub

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