Fw: Re: User input masks - Access Style

[linmq]

> On 2010-12-27, flebber  <flebber.c... at gmail.com > wrote:
>
>  > Is there anyay to use input masks in python? Similar to the function
>  > found in access where a users input is limited to a type, length and
>  > format.
>
>  > So in my case I want to ensure that numbers are saved in a basic
>  > format.
>  > 1) Currency so input limited to 000.00 eg 1.00, 2.50, 13.80 etc
>
> Some GUIs provide this functionality or provide callbacks for validation
> functions that can determine the validity of the input. ? don't know of
> any modules that provide "formatted input" in a terminal. ?ost terminal
> input functions just read from stdin (in this case a buffered line)
> and output that as a string. ?t is easy enough to validate whether
> terminal input is in the proper.
>
> Your example time code might look like:
>
> ... import re
> ... import sys
> ...
> ... # get the input
> ... print("Please enter time in the format 'MM:SS:HH': ", end="")
> ... timeInput = input()
> ...
> ... # validate the input is in the correct format (usually this would be in
> ... # loop that continues until the user enters acceptable data)
> ... if re.match(r'''^[0-9]{2}:[0-9]{2}:[0-9]{2}$''', timeInput) == None:
> ... ??print("I'm sorry, your input is improperly formated.")
> ... ??sys.exit(1)
> ...
> ... # break the input into its componets
> ... componets = timeInput.split(":")
> ... minutes = int(componets[0])
> ... seconds = int(componets[1])
> ... microseconds = int(componets[2])
> ...
> ... # output the time
> ... print("Your time is: " + "%02d" % minutes + ":" + "%02d" % seconds + ":" +
> ... ??"%02d" % microseconds)
>
> Currency works the same way using validating it against:
> r'''[0-9]+\.[0-9]{2}'''
>
>  > For sports times that is time duration not a system or date times
>  > should I assume that I would need to calculate a user input to a
>  > decimal number and then recalculate it to present it to user?
>
> I am not sure what you are trying to do or asking. ?ython provides time,
> date, datetime, and timedelta objects that can be used for date/time
> calculations, locale based formatting, etc. ?hat you use, if any, will
> depend on what you are actually tring to accomplish. ?our example doesn't
> really show you doing much with the time so it is difficult giving you any
> concrete recommendations.
> 
> yes you are right I should have clarified. The time is a duration over
> distance, so its a speed measure.  Ultimately I will need to store the
> times so I may need to use something likw sqlAlchemy but I am nowehere
> near the advanced but I know that most Db's mysql, postgre etc don't
> support time as a duration as such and i will probably need to store
> it as a decimal and convert it back for the user.
> -- 
> http://mail.python.org/mailman/listinfo/python-list

You can let a user to separately input the days, hours, minutes, etc.
And use the type timedelta to store the time duration:

datetime.timedelta([days[, seconds[, microseconds[, milliseconds[, minutes[, hours[, weeks]]]]]]])

Beyond 2.7, you can use timedelta.total_seconds() to convert the time 
duration to a number for database using. And later restore the number
back to timedelta by timedelta(seconds=?).

Refer to:
http://docs.python.org/library/datetime.html?highlight=timedelta#timedelta-objects

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