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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
x = ['red', 'orange', 'yellow', 'green', 'blue', 'purple']
odds = x[::2]
evens = x[1::2]
print(odds)
print(evens)
# Example 2
x = b'mongoose'
y = x[::-1]
print(y)
# Example 3
x = '寿司'
y = x[::-1]
print(y)
# Example 4
try:
w = '寿司'
x = w.encode('utf-8')
y = x[::-1]
z = y.decode('utf-8')
except:
logging.exception('Expected')
else:
assert False
# Example 5
x = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']
x[::2] # ['a', 'c', 'e', 'g']
x[::-2] # ['h', 'f', 'd', 'b']
# Example 6
x[2::2] # ['c', 'e', 'g']
x[-2::-2] # ['g', 'e', 'c', 'a']
x[-2:2:-2] # ['g', 'e']
x[2:2:-2] # []
# Example 7
y = x[::2] # ['a', 'c', 'e', 'g']
z = y[1:-1] # ['c', 'e']
print(x)
print(y)
print(z)