In Python : Write a function normaliseDate(s) which takes as input a string s and returns a date…

In Python :

Write a function normaliseDate(s) which takes as input a string s and returns a date string of the form YYYY-MM-DD. The function should accept the following input formats: YYYY-MM-DD, YYYY/MM/DD and DD.MM.YYYY, where DD and MM are integers with one or two digits (the day and/or month can be given with or without a leading 0), and YYYY is a four-digit integer. The function converts all of these formats to YYYY-MM-DD.

If the conversion of the format fails (i.e., it is not exactly in any of the formats specified above), the function raises a DateError exception.

Note that this function is only about conversion of formats, and there is no need to check whether the date YYYY-MM-DD actually exists.

Example: Both normaliseDate(‘08.5.2012’) and normaliseDate(‘2012/05/8’) should return the string 2012-05-08, while normaliseDate(‘8.5.212’) should raise a DateError exception.

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