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import datetime
from decimal import BasicContext, Decimal
from email.utils import parsedate
from typing import Optional, Union
ISO8601_DATE_FORMAT = "%Y-%m-%d"
ISO8601_DATETIME_FORMAT = "%Y-%m-%dT%H:%M:%SZ"
def iso8601_date(s: str) -> Union[datetime.date, str]:
"""
Parses an ISO 8601 date string and returns a UTC date object or the string
if the parsing failed.
:param s: ISO 8601-formatted date string (2015-01-25)
:return:
"""
try:
return (
datetime.datetime.strptime(s, ISO8601_DATE_FORMAT)
.replace(tzinfo=datetime.timezone.utc)
.date()
)
except (TypeError, ValueError):
return s
def iso8601_datetime(
s: str,
) -> Union[datetime.datetime, str]:
"""
Parses an ISO 8601 datetime string and returns a UTC datetime object,
or the string if parsing failed.
:param s: ISO 8601-formatted datetime string (2015-01-25T12:34:56Z)
"""
try:
return datetime.datetime.strptime(s, ISO8601_DATETIME_FORMAT).replace(
tzinfo=datetime.timezone.utc
)
except (TypeError, ValueError):
return s
def rfc2822_datetime(s: str) -> Optional[datetime.datetime]:
"""
Parses an RFC 2822 date string and returns a UTC datetime object,
or the string if parsing failed.
:param s: RFC 2822-formatted string date
:return: datetime or str
"""
date_tuple = parsedate(s)
if date_tuple is None:
return None
return datetime.datetime(*date_tuple[:6]).replace(tzinfo=datetime.timezone.utc)
def decimal(d: Optional[str]) -> Union[Decimal, str]:
"""
Parses a decimal string into a Decimal
:param d: decimal string
"""
if not d:
return d
return Decimal(d, BasicContext)
def integer(i: str) -> Union[int, str]:
"""
Parses an integer string into an int
:param i: integer string
:return: int
"""
try:
return int(i)
except (TypeError, ValueError):
return i
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