I have got this value
{'_id'
{'_data': 825FABE6C1000000012B022C0100296E5A100422555F0A203C4F84A0150B250434473D46645F696400645FABE6C1786E540BB69619380004
}
}
I retrieve this value using change['_id']['_data'] which is of type string.
How do I convert it to bytes like object in python?
I tried this
base64.b64encode(change['_id']['_data']).decode()
But still I get the error
TypeError: a bytes-like object is required, not 'str'
Note
As pointed out by @SGT, your data happens to be a valid base 16 string, which makes it a bit unlikely that it has actually been encoded with base 64. It is crucial that you know the actual encoding - decoding with a different codec is going to just yield garbage.
/Note
In your code you're calling base64.b64encode rather than base64.b64decode but for decoding a base-64 str to bytes you need the latter.
>>> import base64
>>> s = "825FABE6C1000000012B022C0100296E5A100422555F0A203C4F84A0150B250434473D46645F696400645FABE6C1786E540BB69619380004"
>>> base64.b64decode(s)
b'\xf3nE\x00\x11:\x0b]4\xd3M4\xd3]\x81\xd3m\x82\xd3]4\xdb\xde\x84\xe4\rt\xd3\x8d\xb6\xe7\x9eE\xd0\r\xb4\xdc.\x05\xf3\x804\xd7\x9d\x01\xdb\x9d8\xdf\x8e;\xdc>:\xeb\x8eE\xeb\xde\xb8\xd3N\xb8\xe4P\x01\x13\xa0\xb5\xef\xce\x84\xe7\x8d\x01\x07\xafz\xd7\xdd\xfc\xd3M8'
>>> bytes.fromhex(s)
b'\x82_\xab\xe6\xc1\x00\x00\x00\x01+\x02,\x01\x00)nZ\x10\x04"U_\n <O\x84\xa0\x15\x0b%\x044G=Fd_id\x00d_\xab\xe6\xc1xnT\x0b\xb6\x96\x198\x00\x04'
>>> bytearray.fromhex(s)
bytearray(b'\x82_\xab\xe6\xc1\x00\x00\x00\x01+\x02,\x01\x00)nZ\x10\x04"U_\n <O\x84\xa0\x15\x0b%\x044G=Fd_id\x00d_\xab\xe6\xc1xnT\x0b\xb6\x96\x198\x00\x04')
If your data is a hexstring then can use
byteArray = bytes.fromhex(change['_id']['_data'])
If you want the base64 encoded version of your string, you can the encode method of the string with base64.b64encode() to get the your data as base64 encoded bytes:
In [65]: data = "825FABE6C1000000012B022C0100296E5A100422555F0A203C4F84A0150B250434473D46645F696400645FABE6C1786E540BB6
...: 9619380004"
In [66]: base64.b64encode(data.encode('utf-8'))
Out[66]: b'ODI1RkFCRTZDMTAwMDAwMDAxMkIwMjJDMDEwMDI5NkU1QTEwMDQyMjU1NUYwQTIwM0M0Rjg0QTAxNTBCMjUwNDM0NDczRDQ2NjQ1RjY5NjQwMDY0NUZBQkU2QzE3ODZFNTQwQkI2OTYxOTM4MDAwNA=='
then, this can be converted to base64 encoded string with the decode() method:
In [67]: base64.b64encode(data.encode('utf-8')).decode()
Out[67]: 'ODI1RkFCRTZDMTAwMDAwMDAxMkIwMjJDMDEwMDI5NkU1QTEwMDQyMjU1NUYwQTIwM0M0Rjg0QTAxNTBCMjUwNDM0NDczRDQ2NjQ1RjY5NjQwMDY0NUZBQkU2QzE3ODZFNTQwQkI2OTYxOTM4MDAwNA=='
str can be converted to bytes with str.encode()bytes can be converted to base64 encoded bytes with base64.b64encode()bytes can be converted to base64 encoded string by calling the decode() method of that object.