LookupError: unknown encoding: future_fstrings

[AlixAbbasi]

I get the following error when I am trying to install it:

`
ubuntu@ubuntu:~/heap$ sudo pip3 install ./libptmalloc/
Processing ./libptmalloc
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error
  
  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [17 lines of output]
      Traceback (most recent call last):
        File "/usr/lib/python3.10/tokenize.py", line 344, in find_cookie
          codec = lookup(encoding)
      LookupError: unknown encoding: future_fstrings
      
      During handling of the above exception, another exception occurred:
      
      Traceback (most recent call last):
        File "<string>", line 2, in <module>
        File "<pip-setuptools-caller>", line 28, in <module>
        File "/usr/lib/python3.10/tokenize.py", line 396, in open
          encoding, lines = detect_encoding(buffer.readline)
        File "/usr/lib/python3.10/tokenize.py", line 373, in detect_encoding
          encoding = find_cookie(first)
        File "/usr/lib/python3.10/tokenize.py", line 352, in find_cookie
          raise SyntaxError(msg)
      SyntaxError: unknown encoding for '/home/ubuntu/heap/libptmalloc/setup.py': future_fstrings
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.
ubuntu@ubuntu:~/heap$ python3 --version
Python 3.10.6

`

Installing or uninstalling future_fstrings package does not seem like affecting the outcome.

[saidelike]

Hi,

Thanks for your report.

It is weird that it complains about fstrings missing since you use Python 3.10 which should have native support for f-strings.

You could always try to install future_fstrings as detailed in https://github.com/nccgroup/libptmalloc/blob/master/docs/InstallGuide.md#libptmalloc-installation to see if that fixes the problem?

Another idea would be to try the following instead to see if you still have the error?

cd libptmalloc
sudo python3 setup.py install

On a final note, you should be able to use libptmalloc even without installing it as detailed in https://github.com/nccgroup/libptmalloc/blob/master/docs/InstallGuide.md#use-without-installation

[AlixAbbasi]

Thank you for the reply. It is indeed weird. I tried to follow your recommendation but I got the same result.

ubuntu@ubuntu:~/heap$ pip3 install -r libptmalloc/requirements.txt
Defaulting to user installation because normal site-packages is not writeable
Requirement already satisfied: hexdump==3.3 in /home/ubuntu/.local/lib/python3.10/site-packages (from -r libptmalloc/requirements.txt (line 1)) (3.3)
Requirement already satisfied: future-fstrings==1.2.0 in /home/ubuntu/.local/lib/python3.10/site-packages (from -r libptmalloc/requirements.txt (line 3)) (1.2.0)

ubuntu@ubuntu:~/heap$ cd libptmalloc/

ubuntu@ubuntu:~/heap/libptmalloc$ sudo python3 setup.py install
SyntaxError: encoding problem: future_fstrings
ubuntu@ubuntu:~/heap/libptmalloc$ 

As you see I already have future strings. I tried to then delete it and install it via installation script:

ubuntu@ubuntu:~/heap/libptmalloc$ pip3 uninstall future-fstrings
Found existing installation: future-fstrings 1.2.0
Uninstalling future-fstrings-1.2.0:
  Would remove:
    /home/ubuntu/.local/bin/future-fstrings-show
    /home/ubuntu/.local/lib/python3.10/site-packages/aaaaa_future_fstrings.pth
    /home/ubuntu/.local/lib/python3.10/site-packages/future_fstrings-1.2.0.dist-info/*
    /home/ubuntu/.local/lib/python3.10/site-packages/future_fstrings.py
Proceed (Y/n)? Y
  Successfully uninstalled future-fstrings-1.2.0
ubuntu@ubuntu:~/heap/libptmalloc$ cd ..
ubuntu@ubuntu:~/heap$ pip3 install -r libptmalloc/requirements.txt
Defaulting to user installation because normal site-packages is not writeable
Requirement already satisfied: hexdump==3.3 in /home/ubuntu/.local/lib/python3.10/site-packages (from -r libptmalloc/requirements.txt (line 1)) (3.3)
Collecting future-fstrings==1.2.0
  Using cached future_fstrings-1.2.0-py2.py3-none-any.whl (6.1 kB)
Installing collected packages: future-fstrings
Successfully installed future-fstrings-1.2.0
ubuntu@ubuntu:~/heap$ 
ubuntu@ubuntu:~/heap$ cd libptmalloc/
ubuntu@ubuntu:~/heap/libptmalloc$ sudo python3 setup.py install
SyntaxError: encoding problem: future_fstrings
ubuntu@ubuntu:~/heap/libptmalloc$ 

Which unfortunately yield the same result. Here is system info (note ARM 64)

ubuntu@ubuntu:~/heap/libptmalloc$ uname -a
Linux ubuntu 5.15.0-52-generic #58-Ubuntu SMP Thu Oct 13 08:04:57 UTC 2022 aarch64 aarch64 aarch64 GNU/Linux
ubuntu@ubuntu:~/heap/libptmalloc$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 22.04.1 LTS
Release:	22.04
Codename:	jammy

[saidelike]

I guess it is due to ARM64 as I might have not tried to install it on ARM64. I have just tried to install it on a AMD64 Ubuntu system and it worked fine.

Can you use libptmalloc without installing it, just by importing it, following https://github.com/nccgroup/libptmalloc/blob/master/docs/InstallGuide.md#use-without-installation ?