What's the good of that?

1. Cast the string representation of simple objects to the desired type.
2. Safe type casting. The exception will not be thrown. The function returns status and result.

install

pip install try-parse

import

from try_parse.utils import ParseUtils

try_parse_date

Parse object to date

status, target = ParseUtils.try_parse_date('2018-11-23')
self.assertTrue(status)
self.assertIsInstance(target, date)
self.assertEqual(target, date(2018, 11, 23))

# See format https://docs.python.org/3/library/datetime.html#strftime-strptime-behavior
status, target = ParseUtils.try_parse_date('23.11.2018', format='%d.%m.%Y')
self.assertTrue(status)
self.assertIsInstance(target, date)
self.assertEqual(target, date(2018, 11, 23))

status, target = ParseUtils.try_parse_date('Invalid')
self.assertFalse(status)
self.assertIsNone(target)

try_parse_datetime

Parse object to datetime

status, target = ParseUtils.try_parse_datetime('2018-11-23 01:45:59')
self.assertTrue(status)
self.assertIsInstance(target, datetime)
self.assertEqual(target, datetime(2018, 11, 23, 1, 45, 59))

# See format https://docs.python.org/3/library/datetime.html#strftime-strptime-behavior
status, target = ParseUtils.try_parse_datetime('23.11.2018T01:45:59', format='%d.%m.%YT%H:%M:%S')
self.assertTrue(status)
self.assertIsInstance(target, datetime)
self.assertEqual(target, datetime(2018, 11, 23, 1, 45, 59))

status, target = ParseUtils.try_parse_datetime('Invalid')
self.assertFalse(status)
self.assertIsNone(target)

try_parse_int

Parse object to int

status, target = ParseUtils.try_parse_int('19')
self.assertTrue(status)
self.assertIsInstance(target, int)
self.assertEqual(target, 19)

status, target = ParseUtils.try_parse_int('Invalid')
self.assertFalse(status)
self.assertIsNone(target)

try_parse_float

Parse object to float

status, target = ParseUtils.try_parse_float('19.00')
self.assertTrue(status)
self.assertIsInstance(target, float)
self.assertEqual(target, 19.00)

status, target = ParseUtils.try_parse_float('Invalid')
self.assertFalse(status)
self.assertIsNone(target)

try_parse_decimal

Parse object to decimal

status, target = ParseUtils.try_parse_decimal('19.00')
self.assertTrue(status)
self.assertIsInstance(target, Decimal)
self.assertEqual(target, Decimal(19))

status, target = ParseUtils.try_parse_decimal('Invalid')
self.assertFalse(status)
self.assertIsNone(target)

try_parse_bool

Parse object to bool

for p in ["yes", "true", "t", "1", 1]:
    status, target = ParseUtils.try_parse_bool(p)
    self.assertTrue(status)
    self.assertIsInstance(target, bool)
    self.assertTrue(target)

status, target = ParseUtils.try_parse_bool('Invalid')
self.assertFalse(status)
self.assertIsNone(target)

Mypy

Mypy can be installed using pip:

pip install -U mypy

Testing

mypy ./try_parse/utils.py

Run unittest from console

python -m unittest discover -p "*_tests.py"