TypeError: 'bytes' object is not callable

Question

Edit:

I made the very trivial mistake of having bound bytes to something else previous to executing the following code. This question is now entirely trivial and probably doesn't help anyone. Sorry.

Original question:

Code:

import sys
print(sys.version)
b = bytes([10, 20, 30, 40])
print(b)

Output:

3.5.1 (v3.5.1:37a07cee5969, Dec  5 2015, 21:12:44) 
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)]
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-38-21fec5626bc3> in <module>()
      1 import sys
      2 print(sys.version)
----> 3 b = bytes([10, 20, 30, 40])
      4 print(b)

TypeError: 'bytes' object is not callable

Documentation:

Type:        bytes
String form: b'hello world'
Length:      11
Docstring:
bytes(iterable_of_ints) -> bytes
bytes(string, encoding[, errors]) -> bytes
bytes(bytes_or_buffer) -> immutable copy of bytes_or_buffer
bytes(int) -> bytes object of size given by the parameter initialized with null bytes
bytes() -> empty bytes object

Construct an immutable array of bytes from:
  - an iterable yielding integers in range(256)
  - a text string encoded using the specified encoding
  - any object implementing the buffer API.
  - an integer

What am I doing wrong?

This helped me. I did the same thing. :)

skelliam
– skelliam

2020-01-07 16:01:56 +00:00
Commented Jan 7, 2020 at 16:01 — skelliam
– skelliam, Commented Jan 7, 2020 at 16:01

Martijn Pieters · Accepted Answer · 2016-09-02 12:05:24Z

5

You have assigned a bytes value to the name bytes:

>>> bytes([10, 20, 30, 40])
b'\n\x14\x1e('
>>> bytes = bytes([10, 20, 30, 40])
>>> bytes([10, 20, 30, 40])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'bytes' object is not callable

bytes is now bound to the value b'\n\x14\x1e(', which is not callable. This global is shadowing the built-in. Delete it:

del bytes

to reveal the built-in again.

answered Sep 2, 2016 at 12:05

Martijn Pieters

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2 Comments

Ray Over a year ago

Oh wow that's the stupidest thing I've done. Please down-vote me some more.

user1717828 Over a year ago

@Ray In 1999, someone at Lockheed Martin crashed a $125M spacecraft into Mars because they used imperial units instead of metric ones. Don't feel too bad about this!

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