Python String to dateTime转换

Question

I have a string like

a = "datetime.datetime(2009,04,01)"

I would like to convert this to a datetime object in python. How should I proceed?

Answer 1

The code in the previous answer would work, but using eval is considered risky, because an unexpected input could have disastrous consequences. ( Here 's more info on why eval can be dangerous.)

A better option here is to use Python's strptime method:

from datetime import datetime

datetime_string = "datetime.datetime(2017, 3, 31)"
format = "datetime.datetime(%Y, %m, %d)"
datetime_object = datetime.strptime(datetime_string, format)

There are lots of different formats you can use for parsing datetimes from strings. You may want to check out the docs: https://docs.python.org/2/library/datetime.html#strftime-strptime-behavior

Answer 2

you could use eval. eval lets run python code within python program

a = "datetime.datetime(2009,04,01)" 
import datetime
a = eval(a)
print a
print type(a)

will result in

2009-04-01 00:00:00
<type 'datetime.datetime'>

Answer 3

You can use eval

eval('datetime.datetime(2009, 1, 1)')

You'll have to make sure datetime is imported first

>>> import datetime
>>> d = datetime.datetime(2009, 1, 1)
>>> repr(d)
'datetime.datetime(2009, 1, 1, 0, 0)`
>>> eval(repr(d))
datetime.datetime(2009, 1, 1, 0, 0)