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August 21, 2024 02:25
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python - extract date from string (and return the format of matching)
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| from dataclasses import dataclass | |
| from datetime import datetime | |
| # This is basically a draft | |
| # it works, it's just very simplistic | |
| # looks for a single occurrence; match; return | |
| # The main goal it's just parse the date and have control of | |
| # the format I matched. | |
| # Example: read autocomplete field and trigger a search when | |
| # the search term match at least the dd/mm (%d/%m) format. | |
| # if format_key == "day_month": search database for day month | |
| # if format_key == "day_month_year": search database for day month year | |
| def extract_date(text, formats=None): | |
| """Try to parse a date from a string given a list of formats. | |
| >>> extract_date("22/06") | |
| >>> extract_date.<locals>.Date(day=22, month=6, year=1900, format_key='day_month') | |
| >>> date = extract_date("22/06") | |
| >>> date.day | |
| >>> 22 | |
| >>> date.month | |
| >>> 6 | |
| >>> date.year | |
| >>> 1900 | |
| >>> date.date() | |
| >>> datetime.date(1900, 6, 22) | |
| >>> date.format_key | |
| >>> 'day_month' | |
| >>> if date and date.format_key == "day_month": | |
| print("filter by day and month only") | |
| filter by day and month only | |
| """ | |
| @dataclass | |
| class Date: | |
| day: int | |
| month: int | |
| year: int = None | |
| format_key: str = None | |
| def date(self): | |
| return datetime(self.year, self.month, self.day).date() | |
| if not formats: | |
| formats = {"day_month": "%d/%m", "day_month_year": "%d/%m/%Y"} | |
| for key in formats.keys(): | |
| try: | |
| date = datetime.strptime(text.strip(), formats[key]) | |
| return Date(date.day, date.month, date.year, key) | |
| except ValueError: | |
| pass | |
| return None |
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