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effectivepython/example_code/item_05.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
a
=
[
'a'
,
'b'
,
'c'
,
'd'
,
'e'
,
'f'
,
'g'
,
'h'
]
print
(
'First four:'
,
a
[:
4
])
print
(
'Last four: '
,
a
[
-
4
:])
print
(
'Middle two:'
,
a
[
3
:
-
3
])
# Example 2
assert
a
[:
5
]
==
a
[
0
:
5
]
# Example 3
assert
a
[
5
:]
==
a
[
5
:
len
(
a
)]
# Example 4
print
(
a
[:
5
])
print
(
a
[:
-
1
])
print
(
a
[
4
:])
print
(
a
[
-
3
:])
print
(
a
[
2
:
5
])
print
(
a
[
2
:
-
1
])
print
(
a
[
-
3
:
-
1
])
# Example 5
a
[:]
# ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']
a
[:
5
]
# ['a', 'b', 'c', 'd', 'e']
a
[:
-
1
]
# ['a', 'b', 'c', 'd', 'e', 'f', 'g']
a
[
4
:]
# ['e', 'f', 'g', 'h']
a
[
-
3
:]
# ['f', 'g', 'h']
a
[
2
:
5
]
# ['c', 'd', 'e']
a
[
2
:
-
1
]
# ['c', 'd', 'e', 'f', 'g']
a
[
-
3
:
-
1
]
# ['f', 'g']
# Example 6
first_twenty_items
=
a
[:
20
]
last_twenty_items
=
a
[
-
20
:]
# Example 7
try
:
a
[
20
]
except
:
logging
.
exception
(
'Expected'
)
else
:
assert
False
# Example 8
b
=
a
[
4
:]
print
(
'Before: '
,
b
)
b
[
1
]
=
99
print
(
'After: '
,
b
)
print
(
'No change:'
,
a
)
# Example 9
print
(
'Before '
,
a
)
a
[
2
:
7
]
=
[
99
,
22
,
14
]
print
(
'After '
,
a
)
# Example 10
b
=
a
[:]
assert
b
==
a
and
b
is
not
a
# Example 11
b
=
a
print
(
'Before'
,
a
)
a
[:]
=
[
101
,
102
,
103
]
assert
a
is
b
# Still the same list object
print
(
'After '
,
a
)
# Now has different contents
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