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import typing as t
class UserAgent:
"""Represents a parsed user agent header value.
The default implementation does no parsing, only the :attr:`string`
attribute is set. A subclass may parse the string to set the
common attributes or expose other information. Set
:attr:`werkzeug.wrappers.Request.user_agent_class` to use a
subclass.
:param string: The header value to parse.
.. versionadded:: 2.0
This replaces the previous ``useragents`` module, but does not
provide a built-in parser.
"""
platform: t.Optional[str] = None
"""The OS name, if it could be parsed from the string."""
browser: t.Optional[str] = None
"""The browser name, if it could be parsed from the string."""
version: t.Optional[str] = None
"""The browser version, if it could be parsed from the string."""
language: t.Optional[str] = None
"""The browser language, if it could be parsed from the string."""
def __init__(self, string: str) -> None:
self.string: str = string
"""The original header value."""
def __repr__(self) -> str:
return f"<{type(self).__name__} {self.browser}/{self.version}>"
def __str__(self) -> str:
return self.string
def __bool__(self) -> bool:
return bool(self.browser)
def to_header(self) -> str:
"""Convert to a header value."""
return self.string
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