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From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: problem with eval and time
Date: Tue, 06 Nov 2012 00:06:30 -0500
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Xref: csiph.com comp.lang.python:32803

On Mon, 5 Nov 2012 19:32:41 -0800 (PST), Wincent
<ronggui.huang@gmail.com> declaimed the following in
gmane.comp.python.general:

> Dear all, I would like to convert tstr to representation of time, but encounter the following error. Is there a simple way to get what I want? Thanks.
>
	Well... you don't show an example of "what I want"...
 
> >>> import time
> >>> tstr = str(time.localtime())

	Did you look at what you are doing there?

>>> import time
>>> time.localtime()
time.struct_time(tm_year=2012, tm_mon=11, tm_mday=5, tm_hour=23,
tm_min=38, tm_sec=16, tm_wday=0, tm_yday=310, tm_isdst=0)
>>> str(time.localtime())
'time.struct_time(tm_year=2012, tm_mon=11, tm_mday=5, tm_hour=23,
tm_min=40, tm_sec=22, tm_wday=0, tm_yday=310, tm_isdst=0)'
>>> 

	You've created a struct_time object, then turned that into a string
representation.

> >>> eval(tstr)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "<string>", line 1, in <module>
> TypeError: structseq() takes at most 2 arguments (9 given)

	Now you are trying to evaluate that string representation. But the
constructor form uses a /tuple/ of values...

>>> time.struct_time((2012, 11, 5, 23, 47, 32, 0, 310, 0))
time.struct_time(tm_year=2012, tm_mon=11, tm_mday=5, tm_hour=23,
tm_min=47, tm_sec=32, tm_wday=0, tm_yday=310, tm_isdst=0)
>>> 

... not a bunch of position/keyword arguments.

	I'd consider it a wart -- commonly the representation is valid for
reconstructing the data...

>>> time.mktime((2012, 11, 5, 23, 47, 32, 0, 310, 0))
1352177252.0
>>> t2 = time.localtime()
>>> t2
time.struct_time(tm_year=2012, tm_mon=11, tm_mday=6, tm_hour=0,
tm_min=3, tm_sec=52, tm_wday=1, tm_yday=311, tm_isdst=0)
>>> time.mktime(t2)
1352178232.0
>>> 

	But really, what do you mean by "representation of time"?

>>> time.asctime()
'Tue Nov 06 00:05:39 2012'
>>> 
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/