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Copy pathitem_05.py
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executable file
·113 lines (88 loc) · 2.81 KB
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#!/usr/bin/env PYTHONHASHSEED=1234 python3
# Copyright 2014-2019 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.
# Reproduce book environment
import random
random.seed(1234)
import logging
from pprint import pprint
from sys import stdout as STDOUT
# Write all output to a temporary directory
import atexit
import gc
import io
import os
import tempfile
TEST_DIR = tempfile.TemporaryDirectory()
atexit.register(TEST_DIR.cleanup)
# Make sure Windows processes exit cleanly
OLD_CWD = os.getcwd()
atexit.register(lambda: os.chdir(OLD_CWD))
os.chdir(TEST_DIR.name)
def close_open_files():
everything = gc.get_objects()
for obj in everything:
if isinstance(obj, io.IOBase):
obj.close()
atexit.register(close_open_files)
# Example 1
from urllib.parse import parse_qs
my_values = parse_qs('red=5&blue=0&green=',
keep_blank_values=True)
print(repr(my_values))
# Example 2
print('Red: ', my_values.get('red'))
print('Green: ', my_values.get('green'))
print('Opacity: ', my_values.get('opacity'))
# Example 3
# For query string 'red=5&blue=0&green='
red = my_values.get('red', [''])[0] or 0
green = my_values.get('green', [''])[0] or 0
opacity = my_values.get('opacity', [''])[0] or 0
print(f'Red: {red!r}')
print(f'Green: {green!r}')
print(f'Opacity: {opacity!r}')
# Example 4
red = int(my_values.get('red', [''])[0] or 0)
green = int(my_values.get('green', [''])[0] or 0)
opacity = int(my_values.get('opacity', [''])[0] or 0)
print(f'Red: {red!r}')
print(f'Green: {green!r}')
print(f'Opacity: {opacity!r}')
# Example 5
red_str = my_values.get('red', [''])
red = int(red_str[0]) if red_str[0] else 0
green_str = my_values.get('green', [''])
green = int(green_str[0]) if green_str[0] else 0
opacity_str = my_values.get('opacity', [''])
opacity = int(opacity_str[0]) if opacity_str[0] else 0
print(f'Red: {red!r}')
print(f'Green: {green!r}')
print(f'Opacity: {opacity!r}')
# Example 6
green_str = my_values.get('green', [''])
if green_str[0]:
green = int(green_str[0])
else:
green = 0
print(f'Green: {green!r}')
# Example 7
def get_first_int(values, key, default=0):
found = values.get(key, [''])
if found[0]:
return int(found[0])
return default
# Example 8
green = get_first_int(my_values, 'green')
print(f'Green: {green!r}')