#!/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 names = ['Cecilia', 'Lise', 'Marie'] counts = [len(n) for n in names] print(counts) # Example 2 longest_name = None max_count = 0 for i in range(len(names)): count = counts[i] if count > max_count: longest_name = names[i] max_count = count print(longest_name) # Example 3 longest_name = None max_count = 0 for i, name in enumerate(names): count = counts[i] if count > max_count: longest_name = name max_count = count assert longest_name == 'Cecilia' # Example 4 longest_name = None max_count = 0 for name, count in zip(names, counts): if count > max_count: longest_name = name max_count = count assert longest_name == 'Cecilia' # Example 5 names.append('Rosalind') for name, count in zip(names, counts): print(name) # Example 6 import itertools for name, count in itertools.zip_longest(names, counts): print(f'{name}: {count}')