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This module offers a parser for ISO-8601 strings

It is intended to support all valid date, time and datetime formats per the
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        :param sep:
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        Parse an ISO-8601 datetime string into a :class:`datetime.datetime`.

        An ISO-8601 datetime string consists of a date portion, followed
        optionally by a time portion - the date and time portions are separated
        by a single character separator, which is ``T`` in the official
        standard. Incomplete date formats (such as ``YYYY-MM``) may *not* be
        combined with a time portion.

        Supported date formats are:

        Common:

        - ``YYYY``
        - ``YYYY-MM`` or ``YYYYMM``
        - ``YYYY-MM-DD`` or ``YYYYMMDD``

        Uncommon:

        - ``YYYY-Www`` or ``YYYYWww`` - ISO week (day defaults to 0)
        - ``YYYY-Www-D`` or ``YYYYWwwD`` - ISO week and day

        The ISO week and day numbering follows the same logic as
        :func:`datetime.date.isocalendar`.

        Supported time formats are:

        - ``hh``
        - ``hh:mm`` or ``hhmm``
        - ``hh:mm:ss`` or ``hhmmss``
        - ``hh:mm:ss.ssssss`` (Up to 6 sub-second digits)

        Midnight is a special case for `hh`, as the standard supports both
        00:00 and 24:00 as a representation. The decimal separator can be
        either a dot or a comma.


        .. caution::

            Support for fractional components other than seconds is part of the
            ISO-8601 standard, but is not currently implemented in this parser.

        Supported time zone offset formats are:

        - `Z` (UTC)
        - `±HH:MM`
        - `±HHMM`
        - `±HH`

        Offsets will be represented as :class:`dateutil.tz.tzoffset` objects,
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        :param dt_str:
            A string or stream containing only an ISO-8601 datetime string

        :return:
            Returns a :class:`datetime.datetime` representing the string.
            Unspecified components default to their lowest value.

        .. warning::

            As of version 2.7.0, the strictness of the parser should not be
            considered a stable part of the contract. Any valid ISO-8601 string
            that parses correctly with the default settings will continue to
            parse correctly in future versions, but invalid strings that
            currently fail (e.g. ``2017-01-01T00:00+00:00:00``) are not
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