CODEWITHSUNDEEP
arrayspython-3.x
Keir Finlow-Bates
Keir Finlow-Bates

Reputation: 1053

Convert bytearray to bytes-like object

In Python 3 I'm getting error TypeError: a bytes-like object is required, not 'bytearray'

I have a bytearray, which looks like this:

print(my_ba)     # bytearray(b'}\x0e\x15/ow4|-')

If I enter this in the console it works:

>>> print(base58.b58encode(b'}\x0e\x15/ow4|-'))
2bKmhuGiGP7t8

But this gives an error, and I can't find out how to get the b'' string from the bytearray:

>>> print(base58.b58encode(my_ba))
TypeError: a bytes-like object is required, not 'bytearray'

I'm sure it's obvious, but how do I convert the bytearray to a string with a b prefix?

Upvotes: 37

Views: 64418

Answers (3)

JamesTheAwesomeDude
JamesTheAwesomeDude

Reputation: 1051

This was a bug.

It was fixed in version 2.0.0 of base58, released in January 2020.

And of course, as previously noted, the workaround you can apply when this happens in other situations is just "casting" to bytes:

buggy_function(bytes(my_byteslike))

Note: this has the overhead of copying all the data, when the data isn't already exactly the bytes type

Upvotes: 2

cottontail
cottontail

Reputation: 23439

Concatenation between bytes and bytearray takes the type of the first item, so concatenating a bytearray to an empty byte string also converts it into bytes.

my_ba = bytearray(b'}\x0e\x15/ow4|-')
my_ba = b"" + my_ba
print(type(my_ba))    # <class 'bytes'>

With that being said, this error probably doesn't show up in the recent versions of whatever library you're using because bytearray is a bytes-like type. For example, base58 accepts bytearray as is since version 1.0.3..

Upvotes: 2

jsbueno
jsbueno

Reputation: 110696

As Coldspeed put it in the comments, just pass a bytearray to a bytes call:

bytes(my_ba)

Upvotes: 73

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