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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

import random

with open('my_file.txt', 'w') as f:

for _ in range(10):

f.write('a' * random.randint(0, 100))

f.write('\n')

value = [len(x) for x in open('my_file.txt')]

print(value)

# Example 2

it = (len(x) for x in open('my_file.txt'))

print(it)

# Example 3

print(next(it))

print(next(it))

# Example 4

roots = ((x, x**0.5) for x in it)

# Example 5

print(next(roots))