#!/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 random import randint

random_bits = 0

for i in range(32):

if randint(0, 1):

random_bits |= 1 << i

print(bin(random_bits))

# Example 2

flavor_list = ['vanilla', 'chocolate', 'pecan', 'strawberry']

for flavor in flavor_list:

print(f'{flavor} is delicious')

# Example 3

for i in range(len(flavor_list)):

flavor = flavor_list[i]

print(f'{i + 1}: {flavor}')

# Example 4

it = enumerate(flavor_list)

print(next(it))

print(next(it))

# Example 5

for i, flavor in enumerate(flavor_list):

print(f'{i + 1}: {flavor}')

# Example 6

for i, flavor in enumerate(flavor_list, 1):

print(f'{i}: {flavor}')