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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

matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

flat = [x for row in matrix for x in row]

print(flat)

# Example 2

squared = [[x**2 for x in row] for row in matrix]

print(squared)

# Example 3

my_lists = [

[[1, 2, 3], [4, 5, 6]],

[[7, 8, 9], [10, 11, 12]],

]

flat = [x for sublist1 in my_lists

for sublist2 in sublist1

for x in sublist2]

print(flat)

# Example 4

flat = []

for sublist1 in my_lists:

for sublist2 in sublist1:

flat.extend(sublist2)

print(flat)

# Example 5

a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

b = [x for x in a if x > 4 if x % 2 == 0]

c = [x for x in a if x > 4 and x % 2 == 0]

print(b)

print(c)

assert b and c

assert b == c

# Example 6

matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

filtered = [[x for x in row if x % 3 == 0]

for row in matrix if sum(row) >= 10]

print(filtered)