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�<<bHK�@s�dZddlmZmZmZddlmZzeWney%ddlm	ZYnwddl
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d�ZGdd�de�ZGdd�de�ZGdd�de�Zddd�ZdS)zBBase classes and helpers for building zone specific tzinfo classes�)�datetime�	timedelta�tzinfo)�bisect_right)�SetN)�AmbiguousTimeError�NonExistentTimeErrorcCs4zt|WStyt|d�}|t|<|YSw)z3Create only one instance of each distinct timedelta��seconds)�_timedelta_cache�KeyErrorr)r
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��rcCs|j|jdddS)zConvert a timedelta to seconds��<)r
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zStaticTzInfo.localizecCs*|j|ur|S|jdurtd��|�|�S)aCorrect the timezone information on the given datetime.

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        >>> from pytz import timezone
        >>> gmt = timezone('GMT')
        >>> isinstance(gmt, StaticTzInfo)
        True
        >>> dt = datetime(2011, 5, 8, 1, 2, 3, tzinfo=gmt)
        >>> gmt.normalize(dt) is dt
        True

        The supported method of converting between timezones is to use
        datetime.astimezone(). Currently normalize() also works:

        >>> la = timezone('America/Los_Angeles')
        >>> dt = la.localize(datetime(2011, 5, 7, 1, 2, 3))
        >>> fmt = '%Y-%m-%d %H:%M:%S %Z (%z)'
        >>> gmt.normalize(dt).strftime(fmt)
        '2011-05-07 08:02:03 GMT (+0000)'
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ddd�Zddd�Zdd�Zdd�ZdS)�	DstTzInfoz�A timezone that has a variable offset from UTC

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zDstTzInfo.fromutccCs8|jdur	td��|jj}|jdd�}||}|�|�S)aICorrect the timezone information on the given datetime

        If date arithmetic crosses DST boundaries, the tzinfo
        is not magically adjusted. This method normalizes the
        tzinfo to the correct one.

        To test, first we need to do some setup

        >>> from pytz import timezone
        >>> utc = timezone('UTC')
        >>> eastern = timezone('US/Eastern')
        >>> fmt = '%Y-%m-%d %H:%M:%S %Z (%z)'

        We next create a datetime right on an end-of-DST transition point,
        the instant when the wallclocks are wound back one hour.

        >>> utc_dt = datetime(2002, 10, 27, 6, 0, 0, tzinfo=utc)
        >>> loc_dt = utc_dt.astimezone(eastern)
        >>> loc_dt.strftime(fmt)
        '2002-10-27 01:00:00 EST (-0500)'

        Now, if we subtract a few minutes from it, note that the timezone
        information has not changed.

        >>> before = loc_dt - timedelta(minutes=10)
        >>> before.strftime(fmt)
        '2002-10-27 00:50:00 EST (-0500)'

        But we can fix that by calling the normalize method

        >>> before = eastern.normalize(before)
        >>> before.strftime(fmt)
        '2002-10-27 01:50:00 EDT (-0400)'

        The supported method of converting between timezones is to use
        datetime.astimezone(). Currently, normalize() also works:

        >>> th = timezone('Asia/Bangkok')
        >>> am = timezone('Europe/Amsterdam')
        >>> dt = th.localize(datetime(2011, 5, 7, 1, 2, 3))
        >>> fmt = '%Y-%m-%d %H:%M:%S %Z (%z)'
        >>> am.normalize(dt).strftime(fmt)
        '2011-05-06 20:02:03 CEST (+0200)'
        Nr=r0)rr1r+r2r3)r&r�offsetrrrr?�s
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s�|jdur	td��t�}tdd�tdd�fD]1}||}tdt|j|�d�}|j|}|j|}|�	|j
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        This method should be used to construct localtimes, rather
        than passing a tzinfo argument to a datetime constructor.

        is_dst is used to determine the correct timezone in the ambigous
        period at the end of daylight saving time.

        >>> from pytz import timezone
        >>> fmt = '%Y-%m-%d %H:%M:%S %Z (%z)'
        >>> amdam = timezone('Europe/Amsterdam')
        >>> dt  = datetime(2004, 10, 31, 2, 0, 0)
        >>> loc_dt1 = amdam.localize(dt, is_dst=True)
        >>> loc_dt2 = amdam.localize(dt, is_dst=False)
        >>> loc_dt1.strftime(fmt)
        '2004-10-31 02:00:00 CEST (+0200)'
        >>> loc_dt2.strftime(fmt)
        '2004-10-31 02:00:00 CET (+0100)'
        >>> str(loc_dt2 - loc_dt1)
        '1:00:00'

        Use is_dst=None to raise an AmbiguousTimeError for ambiguous
        times at the end of daylight saving time

        >>> try:
        ...     loc_dt1 = amdam.localize(dt, is_dst=None)
        ... except AmbiguousTimeError:
        ...     print('Ambiguous')
        Ambiguous

        is_dst defaults to False

        >>> amdam.localize(dt) == amdam.localize(dt, False)
        True

        is_dst is also used to determine the correct timezone in the
        wallclock times jumped over at the start of daylight saving time.

        >>> pacific = timezone('US/Pacific')
        >>> dt = datetime(2008, 3, 9, 2, 0, 0)
        >>> ploc_dt1 = pacific.localize(dt, is_dst=True)
        >>> ploc_dt2 = pacific.localize(dt, is_dst=False)
        >>> ploc_dt1.strftime(fmt)
        '2008-03-09 02:00:00 PDT (-0700)'
        >>> ploc_dt2.strftime(fmt)
        '2008-03-09 02:00:00 PST (-0800)'
        >>> str(ploc_dt2 - ploc_dt1)
        '1:00:00'

        Use is_dst=None to raise a NonExistentTimeError for these skipped
        times.

        >>> try:
        ...     loc_dt1 = pacific.localize(dt, is_dst=None)
        ... except NonExistentTimeError:
        ...     print('Non-existent')
        Non-existent
        Nr;���)rrrr0�)�hoursT�r5Fcs g|]}t|jj��kr|�qSr)�boolrrH)�.0�prVrr�
<listcomp>osz&DstTzInfo.localize.<locals>.<listcomp>)rr1�setrrOrrPrIrGr?r2�add�len�poprr<r�listr+�min)
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zDstTzInfo.localizecC�0|durdS|j|ur|�||�}|jjS|jS)aLSee datetime.tzinfo.utcoffset

        The is_dst parameter may be used to remove ambiguity during DST
        transitions.

        >>> from pytz import timezone
        >>> tz = timezone('America/St_Johns')
        >>> ambiguous = datetime(2009, 10, 31, 23, 30)

        >>> str(tz.utcoffset(ambiguous, is_dst=False))
        '-1 day, 20:30:00'

        >>> str(tz.utcoffset(ambiguous, is_dst=True))
        '-1 day, 21:30:00'

        >>> try:
        ...     tz.utcoffset(ambiguous)
        ... except AmbiguousTimeError:
        ...     print('Ambiguous')
        Ambiguous

        N)rr<r+r4rrrr6�s
zDstTzInfo.utcoffsetcCrg)a�See datetime.tzinfo.dst

        The is_dst parameter may be used to remove ambiguity during DST
        transitions.

        >>> from pytz import timezone
        >>> tz = timezone('America/St_Johns')

        >>> normal = datetime(2009, 9, 1)

        >>> str(tz.dst(normal))
        '1:00:00'
        >>> str(tz.dst(normal, is_dst=False))
        '1:00:00'
        >>> str(tz.dst(normal, is_dst=True))
        '1:00:00'

        >>> ambiguous = datetime(2009, 10, 31, 23, 30)

        >>> str(tz.dst(ambiguous, is_dst=False))
        '0:00:00'
        >>> str(tz.dst(ambiguous, is_dst=True))
        '1:00:00'
        >>> try:
        ...     tz.dst(ambiguous)
        ... except AmbiguousTimeError:
        ...     print('Ambiguous')
        Ambiguous

        N)rr<rHr4rrrr9�s
z
DstTzInfo.dstcCs2|dur|jS|j|ur|�||�}|jjS|jS)a�See datetime.tzinfo.tzname

        The is_dst parameter may be used to remove ambiguity during DST
        transitions.

        >>> from pytz import timezone
        >>> tz = timezone('America/St_Johns')

        >>> normal = datetime(2009, 9, 1)

        >>> tz.tzname(normal)
        'NDT'
        >>> tz.tzname(normal, is_dst=False)
        'NDT'
        >>> tz.tzname(normal, is_dst=True)
        'NDT'

        >>> ambiguous = datetime(2009, 10, 31, 23, 30)

        >>> tz.tzname(ambiguous, is_dst=False)
        'NST'
        >>> tz.tzname(ambiguous, is_dst=True)
        'NDT'
        >>> try:
        ...     tz.tzname(ambiguous)
        ... except AmbiguousTimeError:
        ...     print('Ambiguous')
        Ambiguous
        N)r$rr<r,r4rrrr:�s
zDstTzInfo.tznamecCsF|jrd}nd}|jtkrd|j|j|j|fSd|j|j|j|fS)N�DST�STDz<DstTzInfo %r %s+%s %s>z<DstTzInfo %r %s%s %s>)rHr+r8r$r,)r&r9rrrr@�s
��zDstTzInfo.__repr__cCs"tj|jt|j�t|j�|jffSr")rArBr$rr+rHr,r%rrrrCs�zDstTzInfo.__reduce__)NNrDr")r(r)r*rErPrIr$rGrHrMr3r?r<r6r9r:r@rCrrrrrF�s"	


7


'&rFcCs�t�|�}|dur|St|�}t|�}z	|j|||fWSty%Ynw|j��D]}|j|kr;|j|kr;|Sq+|||f}|�||j�|j|<|j|S)a%Factory function for unpickling pytz tzinfo instances.

    This is shared for both StaticTzInfo and DstTzInfo instances, because
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    N)	rA�timezonerrGr�valuesr+rHrJ)r$r6�	dstoffsetr:�tz�localized_tzrLrrr�	unpicklers$

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ro)NNN)rErrr�bisectrr[�	NameError�setsrrA�pytz.exceptionsrr�__all__rr�utcfromtimestamprrrrrr8rr r-rFrorrrr�<module>s4�
	

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