# Copyright 2014 Brett Slatkin, Pearson Education Inc.
#
# 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 1
from time import sleep
from datetime import datetime
def log(message, when=datetime.now()):
print('%s: %s' % (when, message))
log('Hi there!')
sleep(0.1)
log('Hi again!')
2016-05-05 20:33:45.066477: Hi there! 2016-05-05 20:33:45.066477: Hi again!
# Example 2
def log(message, when=None):
"""Log a message with a timestamp.
Args:
message: Message to print.
when: datetime of when the message occurred.
Defaults to the present time.
"""
when = datetime.now() if when is None else when
print('%s: %s' % (when, message))
# Example 3
log('Hi there!')
sleep(0.1)
log('Hi again!')
2016-05-05 20:33:45.183324: Hi there! 2016-05-05 20:33:45.285816: Hi again!
# Example 4
import json
def decode(data, default={}):
try:
return json.loads(data)
except ValueError:
return default
# Example 5
foo = decode('bad data')
foo['stuff'] = 5
bar = decode('also bad')
bar['meep'] = 1
print('Foo:', foo)
print('Bar:', bar)
Foo: {'stuff': 5, 'meep': 1} Bar: {'stuff': 5, 'meep': 1}
# Example 6
assert foo is bar
# Example 7
def decode(data, default=None):
"""Load JSON data from a string.
Args:
data: JSON data to decode.
default: Value to return if decoding fails.
Defaults to an empty dictionary.
"""
if default is None:
default = {}
try:
return json.loads(data)
except ValueError:
return default
# Example 8
foo = decode('bad data')
foo['stuff'] = 5
bar = decode('also bad')
bar['meep'] = 1
print('Foo:', foo)
print('Bar:', bar)
Foo: {'stuff': 5} Bar: {'meep': 1}