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effectivepython/example_code/item_15.py at master · AISTLAB/effectivepython · GitHub
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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
def
sort_priority
(
values
,
group
):
def
helper
(
x
):
if
x
in
group
:
return
(
0
,
x
)
return
(
1
,
x
)
values
.
sort
(
key
=
helper
)
# Example 2
numbers
=
[
8
,
3
,
1
,
2
,
5
,
4
,
7
,
6
]
group
=
{
2
,
3
,
5
,
7
}
sort_priority
(
numbers
,
group
)
print
(
numbers
)
# Example 3
def
sort_priority2
(
numbers
,
group
):
found
=
False
def
helper
(
x
):
if
x
in
group
:
found
=
True
# Seems simple
return
(
0
,
x
)
return
(
1
,
x
)
numbers
.
sort
(
key
=
helper
)
return
found
# Example 4
found
=
sort_priority2
(
numbers
,
group
)
print
(
'Found:'
,
found
)
print
(
numbers
)
# Example 5
def
sort_priority2
(
numbers
,
group
):
found
=
False
# Scope: 'sort_priority2'
def
helper
(
x
):
if
x
in
group
:
found
=
True
# Scope: 'helper' -- Bad!
return
(
0
,
x
)
return
(
1
,
x
)
numbers
.
sort
(
key
=
helper
)
return
found
# Example 6
def
sort_priority3
(
numbers
,
group
):
found
=
False
def
helper
(
x
):
nonlocal
found
if
x
in
group
:
found
=
True
return
(
0
,
x
)
return
(
1
,
x
)
numbers
.
sort
(
key
=
helper
)
return
found
# Example 7
found
=
sort_priority3
(
numbers
,
group
)
print
(
'Found:'
,
found
)
print
(
numbers
)
# Example 8
class
Sorter
(
object
):
def
__init__
(
self
,
group
):
self
.
group
=
group
self
.
found
=
False
def
__call__
(
self
,
x
):
if
x
in
self
.
group
:
self
.
found
=
True
return
(
0
,
x
)
return
(
1
,
x
)
sorter
=
Sorter
(
group
)
numbers
.
sort
(
key
=
sorter
)
assert
sorter
.
found
is
True
print
(
'Found:'
,
found
)
print
(
numbers
)
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