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#!/usr/bin/env python3

# 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 threading import Lock

lock = Lock()

with lock:

print('Lock is held')

# Example 2

lock.acquire()

try:

print('Lock is held')

finally:

lock.release()

# Example 3

import logging

logging.getLogger().setLevel(logging.WARNING)

def my_function():

logging.debug('Some debug data')

logging.error('Error log here')

logging.debug('More debug data')

# Example 4

my_function()

# Example 5

from contextlib import contextmanager

@contextmanager

def debug_logging(level):

logger = logging.getLogger()

old_level = logger.getEffectiveLevel()

logger.setLevel(level)

try:

yield

finally:

logger.setLevel(old_level)

# Example 6

with debug_logging(logging.DEBUG):

print('Inside:')

my_function()

print('After:')

my_function()

# Example 7

with open('my_output.txt', 'w') as handle:

handle.write('This is some data!')

# Example 8

@contextmanager

def log_level(level, name):

logger = logging.getLogger(name)

old_level = logger.getEffectiveLevel()

logger.setLevel(level)

try:

yield logger

finally:

logger.setLevel(old_level)

# Example 9

with log_level(logging.DEBUG, 'my-log') as logger:

logger.debug('This is my message!')

logging.debug('This will not print')

# Example 10

logger = logging.getLogger('my-log')

logger.debug('Debug will not print')

logger.error('Error will print')