How to get part of string and pass it to other function in python?

Question

My task is to verify whether string is valid date and time or not.

\"2013-01-01W23:01:01\"

The date and the time are separated with

Answer 1

If you are not sure whether it is a valid date or time, you should use regular expressions to validate the string, then you don't even need to call is_time and is_date.

import re
pattern = re.compile("^(\d{4}-\d{2}-\d{2})[W ](\d{2}:\d{2}:\d{2})$")
# ...
value = "2013-01-01W23:01:01"
match = pattern.findall(value)
if match:
  pass #is valid

This will test whether something looks like a date&time.

You can of course use more advanced regexes.

^(\d{4}-(11|12|0\d)-(3[10]|[12]\d))[W ]((2[0-3]|[01]\d):[0-5]\d:[0-5]\d)$

This one tests for valid date and time values (so it doesn't match 27:99:01 anymore), but still matches invalid dates, like 2014-02-31. If you want to exclude those cases, you can access the relevant parts of the match as items of the match variable and test for things like number of days of a month and leap years.