effectivepython/example_code/item_06.py at master · AISTLAB/effectivepython · GitHub

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#!/usr/bin/env python3

# 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

a = ['red', 'orange', 'yellow', 'green', 'blue', 'purple']

odds = a[::2]

evens = a[1::2]

print(odds)

print(evens)

# Example 2

x = b'mongoose'

y = x[::-1]

print(y)

# Example 3

try:

w = '謝謝'

x = w.encode('utf-8')

y = x[::-1]

z = y.decode('utf-8')

except:

logging.exception('Expected')

else:

assert False

# Example 4

a = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']

a[::2] # ['a', 'c', 'e', 'g']

a[::-2] # ['h', 'f', 'd', 'b']

# Example 5

a[2::2] # ['c', 'e', 'g']

a[-2::-2] # ['g', 'e', 'c', 'a']

a[-2:2:-2] # ['g', 'e']

a[2:2:-2] # []

# Example 6

b = a[::2] # ['a', 'c', 'e', 'g']

c = b[1:-1] # ['c', 'e']

print(a)

print(b)

print(c)

effectivepython/example_code/item_06.py at master · AISTLAB/effectivepython · GitHub

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