# 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
def index_words(text):
result = []
if text:
result.append(0)
for index, letter in enumerate(text):
if letter == ' ':
result.append(index + 1)
return result
# Example 2
address = 'Four score and seven years ago...'
address = 'Four score and seven years ago our fathers brought forth on this continent a new nation, conceived in liberty, and dedicated to the proposition that all men are created equal.'
result = index_words(address)
print(result[:3])
[0, 5, 11]
# Example 3
def index_words_iter(text):
if text:
yield 0
for index, letter in enumerate(text):
if letter == ' ':
yield index + 1
### list? Think of memory!!
# Example 4
result = list(index_words_iter(address))
print(result[:3])
[0, 5, 11]
# Example 5
def index_file(handle):
offset = 0
for line in handle:
if line:
yield offset
for letter in line:
offset += 1
if letter == ' ':
yield offset
# Example 6
address_lines = """Four score and seven years
ago our fathers brought forth on this
continent a new nation, conceived in liberty,
and dedicated to the proposition that all men
are created equal."""
with open('address.txt', 'w') as f:
f.write(address_lines)
from itertools import islice
with open('address.txt', 'r') as f:
it = index_file(f)
results = islice(it, 0, 3)
print(list(results))
[0, 5, 11]