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If no file matching key is found, the constructor will raise
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The constructor will raise ValueError if a Key must be in the form of a relative, normalized POSIX path, with no Key, the following assertion will always be true:Ī = ZoneInfo ( key ) b = ZoneInfo ( key ) assert a is b Calls to the primary constructor willĪlways return objects that compare identically put another way, barringĬache invalidation via ZoneInfo.clear_cache(), for all values of ZoneInfo ( key ) ¶Ī concrete datetime.tzinfo subclass that represents an IANA time Specific time zone path (or require disabling access to the system time zones). Though it is reasonable to use it in test functions that require the use of a This is generally not an advisable operation, The TZ search path can also be configured at runtime using the To set the system to ignore the system data and use the tzdata package
#AMERICA TIME ZONES FREE#
Other implementations are free to silently ignore the erroneous component Implementation-defined CPython will raise InvalidTZPathWarning, but Relative components specified in PYTHONTZPATH will not be used,īut otherwise the behavior when a relative path is specified is It must consist of only absolute rather than relative This is an os.pathsep-separated string containing the time zone Use the environment variable PYTHONTZPATH, if it exists, to set the search Reset_tzpath() is called with no arguments), the zoneinfo module will When initializing TZPATH (either at import time or whenever On all platforms, the configured value is available as the TZPATH key in The compile-time option TZPATH (or, more likely, the configure flag -with-tzpath), which should be a string delimited by Time zone data is deployed may change the default time zone path by specifying Those building Python from source who know where their system
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On POSIX systems, downstream distributors and Time zone database (except on Windows, where there are no “well-known” The default TZPATH includes several common deployment locations for the Manipulated using the reset_tzpath() function. TZPATH can be configured using an environment variable. The default TZPATH when not otherwise specified can be configured at When ZoneInfo(key) is called, the constructor first searches theĭirectories specified in TZPATH for a file matching key, and onįailure looks for a match in the tzdata package. Tzdata are available, all calls to ZoneInfo will raise Is recommended to declare a dependency on tzdata. Projects targeting cross-platform compatibility that require time zone data, it
#AMERICA TIME ZONES WINDOWS#
Notably Windows systems, do not have an IANA database available, and so for Pulls time zone information from the system time zone database or theįirst-party PyPI package tzdata, if available. The zoneinfo module does not directly provide time zone data, and instead astimezone ( LOS_ANGELES )) 01:00:00-07:00 > # After the PDT -> PST transition > print (( dt_utc + timedelta ( hours = 1 )). utc ) > # Before the PDT -> PST transition > print ( dt_utc.
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from datetime import timezone > LOS_ANGELES = ZoneInfo ( "America/Los_Angeles" ) > dt_utc = datetime ( 2020, 11, 1, 8, tzinfo = timezone.