I've develope a "simple" function to calculate the difference between 2
dates, and the time that they are interpolated.
I need it to: I arrive to a site at a hour (my_from), I go out from the site
at a hour (my_to). Some friend arrive at the site at a hour (his_from) and
let it at a hour (his_to)
If I stay in the site after he arrives and before he goes out, the
"probability" of match is 1, if I let the site after he arrives, the
probability of match is 0... You can see the samples in the documentation.
I need to know if this is a good way to do, and if compare all the kinds of
matching (I've found 6). This is the code:
def time_match(self, my_from, my_to, his_from, his_to):
"""
I've found 6 general kinds of time matching. It's better to
explain it with graphics:
(my_from)--A--(my_to)
-------------------------
(his_from)--B--(his_to)
"""
# |-A-| |-A-|
# -------------------- or --------------------
# |--B--| |--B--|
if my_to < his_from or his_to < my_from:
return 0
# |--A--|
# --------------------
# |------B-------|
elif my_from >= his_from and my_to <= his_to:
return 1
# |-----A-------|
# --------------------
# |-B-|
elif my_from < his_from and my_to > his_to:
my_diff_to_reuse = diff_in_seconds(my_from, my_to)
diff = my_diff_to_reuse - self.diff_in_seconds(his_from, his_to)
return (diff / my_diff_to_reuse)
# |---A---|
# --------------------
# |---B---|
elif my_from <= his_from and my_to <= his_to:
diff = self.diff_in_seconds(his_from, my_to)
return (diff / self.diff_in_seconds(my_from, my_to))
# |---A---|
# --------------------
# |---B---|
elif my_from >= his_from and my_to >= his_to:
diff = self.diff_in_seconds(my_from, his_to)
return (diff / self.diff_in_seconds(my_from, my_to))
# If I'm here I have a problem
return 0
def diff_in_seconds(date1, date2):
# Initial from: http://www.bytemycode.com/snippets/snippet/304/
timedelta = date2 - date1
diff = timedelta.days*24*3600 + timedelta.seconds
return abs(float(diff))
Thanks!
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and/or .pptx
http://mirblu.com
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