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ThinkRubyBuild/code/Time2_soln.py at master · learnbyexample/ThinkRubyBuild · GitHub
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"""This module contains a code example related to
Think Python, 2nd Edition
by Allen Downey
http://thinkpython2.com
Copyright 2015 Allen Downey
License: http://creativecommons.org/licenses/by/4.0/
"""
from
__future__
import
print_function
,
division
class
Time
:
"""Represents the time of day.
attributes: hour, minute, second
"""
def
__init__
(
self
,
hour
=
0
,
minute
=
0
,
second
=
0
):
"""Initializes a time object.
hour: int
minute: int
second: int or float
"""
minutes
=
hour
*
60
+
minute
self
.
seconds
=
minutes
*
60
+
second
def
__str__
(
self
):
"""Returns a string representation of the time."""
minutes
,
second
=
divmod
(
self
.
seconds
,
60
)
hour
,
minute
=
divmod
(
minutes
,
60
)
return
'%.2d:%.2d:%.2d'
%
(
hour
,
minute
,
second
)
def
print_time
(
self
):
"""Prints a string representation of the time."""
print
(
str
(
self
))
def
time_to_int
(
self
):
"""Computes the number of seconds since midnight."""
return
self
.
seconds
def
is_after
(
self
,
other
):
"""Returns True if t1 is after t2; false otherwise."""
return
self
.
seconds
>
other
.
seconds
def
__add__
(
self
,
other
):
"""Adds two Time objects or a Time object and a number.
other: Time object or number of seconds
"""
if
isinstance
(
other
,
Time
):
return
self
.
add_time
(
other
)
else
:
return
self
.
increment
(
other
)
def
__radd__
(
self
,
other
):
"""Adds two Time objects or a Time object and a number."""
return
self
.
__add__
(
other
)
def
add_time
(
self
,
other
):
"""Adds two time objects."""
assert
self
.
is_valid
()
and
other
.
is_valid
()
seconds
=
self
.
seconds
+
other
.
seconds
return
int_to_time
(
seconds
)
def
increment
(
self
,
seconds
):
"""Returns a new Time that is the sum of this time and seconds."""
seconds
+=
self
.
seconds
return
int_to_time
(
seconds
)
def
is_valid
(
self
):
"""Checks whether a Time object satisfies the invariants."""
return
self
.
seconds
>=
0
and
self
.
seconds
<
24
*
60
*
60
def
int_to_time
(
seconds
):
"""Makes a new Time object.
seconds: int seconds since midnight.
"""
return
Time
(
0
,
0
,
seconds
)
def
main
():
start
=
Time
(
9
,
45
,
00
)
start
.
print_time
()
end
=
start
.
increment
(
1337
)
end
.
print_time
()
print
(
'Is end after start?'
)
print
(
end
.
is_after
(
start
))
print
(
'Using __str__'
)
print
(
start
,
end
)
start
=
Time
(
9
,
45
)
duration
=
Time
(
1
,
35
)
print
(
start
+
duration
)
print
(
start
+
1337
)
print
(
1337
+
start
)
print
(
'Example of polymorphism'
)
t1
=
Time
(
7
,
43
)
t2
=
Time
(
7
,
41
)
t3
=
Time
(
7
,
37
)
total
=
sum
([
t1
,
t2
,
t3
])
print
(
total
)
if
__name__
==
'__main__'
:
main
()
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