Re: Python question
- From: "Richard Dinger" <rrdinger@xxxxxxxxxx>
- To: <programmingblind@xxxxxxxxxxxxx>
- Date: Mon, 23 Nov 2009 14:24:53 -0800
Edward,
A few notes about your problem:
1. The signature for your isAfter method should look something like this:
def isAfter(self, other):
then inside the body of the method you can refer to the attributes of each
object like this:
if self.hour > other.hour:
and so forth to make whatever comparisons you like.
2. Outside the class then, you call your isAfter function something like this
for two objects named t1 and t2:
t1.isAfter(t2)
3. Your problem of comparing may be simplified if you pick a better abstraction
for your time. Consider keeping the hour, minute and second in a container
object such as a tuple, which can be compared directly.
4. You can also format your string representation directly from a tuple using
the string formatting operator.
"the time is %02d:%02d:%02d" % hr_min_sec_tuple
5. In your initialization (constructor) method, you do not check for valid
input. As a result negative or too large values may be entered. Consider
using an assertion to control input value errors:
assert hour >= 0
assert hours <= 24
etc.
the assertion will halt execution if an error occurs.
6. Finally, you can overload the "<" and ">" operators in your class and then
compare MakeTime objects directly such as:
if t1 > t2:
Richard
----- Original Message -----
From: edward
To: programmingblind@xxxxxxxxxxxxx
Sent: Saturday, November 21, 2009 4:48 PM
Subject: Python question
hello all
I am trying to check if one time comes immediately after another. I wrote a
method called isAfter. the problem is how do I use it. meaning to use a
method in python the syntax is x.isAfter but I have two variables not one. so
I need to x's.
edward
code starts
class WhatTime:
def __init__(self, hour,minute,second):
self.second=second
self.minute=minute
self.hour=hour
def isAfter(self,t1,t2):
check=t2-t1
return 1 in check
def __str__(self):
return "the time is: "+str(self.hour)+":"+str(self.minute)+"
"+str(self.second)
t=WhatTime(10,25,43)
print t
t1=WhatTime(10,12,13)
t2=WhatTime(10,12,14)
isAfter
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