← Back
Editing: tzinfo.cpython-38.pyc
U ���]HK � @ s� d Z ddlmZmZmZ ddlmZ ze W n ek rL ddlm Z Y nX ddl Z ddl m Z m Z g Zi Zdd� Ze�d�ZdeiZd d � Zi Zd d � Zed�Zd d� ZG dd� de�ZG dd� de�ZG dd� de�Zddd�Z dS )zBBase classes and helpers for building zone specific tzinfo classes� )�datetime� timedelta�tzinfo)� bisect_right)�SetN)�AmbiguousTimeError�NonExistentTimeErrorc C s: z t | W S tk r4 t| d�}|t | < | Y S X dS )z3Create only one instance of each distinct timedelta��secondsN)�_timedelta_cache�KeyErrorr )r �delta� r �-/usr/lib/python3/dist-packages/pytz/tzinfo.py�memorized_timedelta s r c C s> z t | W S tk r8 tt| d� }|t | < | Y S X dS )z2Create only one instance of each distinct datetimer N)�_datetime_cacher �_epochr )r �dtr r r �memorized_datetime s r c G sN z t | W S tk rH t| d �t| d �| d f}|t | < | Y S X dS )z/Create only one instance of each distinct tupler � � N)� _ttinfo_cacher r )�argsZttinfor r r �memorized_ttinfo- s �r c C s | j | jd d d S )z Convert a timedelta to seconds� �< )r �days)Ztdr r r � _to_seconds= s r c @ s e Zd ZdZdZdZdd� ZdS )� BaseTzInfoNc C s | j S �N��zone��selfr r r �__str__H s zBaseTzInfo.__str__)�__name__� __module__� __qualname__� _utcoffset�_tznamer! r$ r r r r r B s r c @ sZ e Zd ZdZdd� Zddd�Zddd�Zdd d �Zdd d �Zddd�Z dd� Z dd� Z dS )� StaticTzInfoz�A timezone that has a constant offset from UTC These timezones are rare, as most locations have changed their offset at some point in their history c C s. |j dk r |j | k r td��|| j j| d�S )�See datetime.tzinfo.fromutcN� fromutc: dt.tzinfo is not self�r )r � ValueErrorr( �replace)r# r r r r �fromutcR s zStaticTzInfo.fromutcNc C s | j S )z�See datetime.tzinfo.utcoffset is_dst is ignored for StaticTzInfo, and exists only to retain compatibility with DstTzInfo. )r( �r# r �is_dstr r r � utcoffsetX s zStaticTzInfo.utcoffsetc C s t S )z�See datetime.tzinfo.dst is_dst is ignored for StaticTzInfo, and exists only to retain compatibility with DstTzInfo. )�_notimer1 r r r �dst` s zStaticTzInfo.dstc C s | j S )z�See datetime.tzinfo.tzname is_dst is ignored for StaticTzInfo, and exists only to retain compatibility with DstTzInfo. )r) r1 r r r �tznameh s zStaticTzInfo.tznameFc C s |j dk rtd��|j| d�S )z Convert naive time to local timeN�*Not naive datetime (tzinfo is already set)r- )r r. r/ r1 r r r �localizep s zStaticTzInfo.localizec C s* |j | kr|S |j dkr td��|�| �S )a Correct the timezone information on the given datetime. This is normally a no-op, as StaticTzInfo timezones never have ambiguous cases to correct: >>> 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)' N�Naive time - no tzinfo set)r r. Z astimezoner1 r r r � normalizev s zStaticTzInfo.normalizec C s d| j f S )Nz<StaticTzInfo %r>r r" r r r �__repr__� s zStaticTzInfo.__repr__c C s t j| jffS r )�pytz�_pr! r" r r r � __reduce__� s zStaticTzInfo.__reduce__)N)N)N)F)F) r% r& r' �__doc__r0 r3 r5 r6 r8 r: r; r> r r r r r* L s r* c @ sv e Zd ZdZdZdZdZdZdZddd�Z dd� Z dd� Z dd d �Z dd d �Z ddd�Zddd�Zdd� Zdd� ZdS )� DstTzInfoz�A timezone that has a variable offset from UTC The offset might change if daylight saving time comes into effect, or at a point in history when the region decides to change their timezone definition. Nc C sz |r || _ |\| _| _| _nZi }|| _ | jd \| _| _| _| || jd < | jdd � D ] }||krX| �||�||< qXd S )Nr r )�_tzinfosr( �_dstr) �_transition_info� __class__)r# Z_infrA �infr r r �__init__� s �zDstTzInfo.__init__c C sl |j dk r&t|j dd�| jk r&td��|jdd�}tdt| j|�d �}| j| }||d j| j| d�S )r+ NrA r, r- r r ) r �getattrrA r. r/ �maxr �_utc_transition_timesrC )r# r �idxrE r r r r0 � s � zDstTzInfo.fromutcc C s8 |j dkrtd��|j j}|jdd�}|| }| �|�S )aI Correct 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)' Nr9 r- )r r. r( r/ r0 )r# r �offsetr r r r: � s - zDstTzInfo.normalizeFc s� |j dk rtd��t� }tdd�tdd�fD ]b}|| }tdt| j|�d �}| j| }| j| }|� |j |d��}|j dd�|kr,|� |� q,t |�dkr�|� � S t |�dk�r � dkr�t|��nH� r�| j|tdd � d d �tdd � S | j|tdd � d d �tdd � S � dk�r t|��� fd d�|D �} t | �dk�rF| d S t | �dk�r\t|�} i } | D ]0} | j dd�| j j } | | k�s�t�| | | < �qd| ttg� | � S )a� Convert naive time to local time. 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 Nr7 ���)r r r r- � )ZhoursT�r2 Fc s g | ]}t |jj�� kr|�qS r )�boolr rB )�.0�prN r r � <listcomp>o s z&DstTzInfo.localize.<locals>.<listcomp>)r r. �setr rH r rI rC rA r: r/ �add�len�popr r8 r �listr( �AssertionError�min) r# r r2 Zpossible_loc_dtr Zloc_dtrJ rE r Zfiltered_possible_loc_dtZdatesZlocal_dtZutc_timer rN r r8 sd ; �� �� �� � � zDstTzInfo.localizec C s4 |dkr dS |j | k r*| �||�}|j jS | jS dS )aL See 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)r r8 r( r1 r r r r3 � s zDstTzInfo.utcoffsetc C s4 |dkr dS |j | k r*| �||�}|j jS | jS dS )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)r r8 rB r1 r r r r5 � s z DstTzInfo.dstc C s6 |dkr| j S |j| k r,| �||�}|jjS | jS dS )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! r r8 r) r1 r r r r6 � s zDstTzInfo.tznamec C sJ | j r d}nd}| jtkr0d| j| j| j|f S d| j| j| j|f S d S )NZDSTZSTDz<DstTzInfo %r %s+%s %s>z<DstTzInfo %r %s%s %s>)rB r( r4 r! r) )r# r5 r r r r; � s � �zDstTzInfo.__repr__c C s" t j| jt| j�t| j�| jffS r )r< r= r! r r( rB r) r" r r r r> s �zDstTzInfo.__reduce__)NN)F)N)N)N)r% r& r' r? rI rC r! rA rB rF r0 r: r8 r3 r5 r6 r; r> r r r r r@ � s 7 ' &r@ c C s� t �| �}|dkr|S t|�}t|�}z|j|||f W S tk rL Y nX |j�� D ] }|j|krX|j|krX| S qX|||f}|�||j�|j|< |j| S )a% Factory function for unpickling pytz tzinfo instances. This is shared for both StaticTzInfo and DstTzInfo instances, because database changes could cause a zones implementation to switch between these two base classes and we can't break pickles on a pytz version upgrade. N) r< �timezoner rA r �valuesr( rB rD )r! r3 Z dstoffsetr6 ZtzZ localized_tzrE r r r � unpickler s" � r\ )NNN) r? r r r Zbisectr rS � NameErrorZsetsr r< Zpytz.exceptionsr r �__all__r r Zutcfromtimestampr r r r r r4 r r r* r@ r\ r r r r �<module> s0 P w
Save File
Cancel