Pierre Neidhardt <ambrevar@gmail.com> writes:

> electrum yields the following error on startup:
>
> 	> electrum
> 	Error: No module named 'qrcode'. Try 'sudo pip install <module-name>'
>
> python-qrcode is correctly specified as input in the package's
> declaration:
>
> --8<---------------cut here---------------start------------->8---
>> guix package --show=electrum
> name: electrum
> version: 3.0.5
> outputs: out
> systems: x86_64-linux i686-linux armhf-linux aarch64-linux
> dependencies: python-dnspython-1.15.0 python-ecdsa-0.13 python-jsonrpclib-pelix-0.3.1 python-pbkdf2-1.3 python-protobuf-3.5.2 python-pyaes-1.6.1 python-pyqt-5.9 python-pysocks-1.6.7
> + python-qrcode-6.0 python-requests-2.13.0 python-sip-4.19.3
> location: gnu/packages/finance.scm:275:2
> homepage: https://electrum.org/
> license: Expat
> synopsis: Bitcoin wallet
> description: Electrum is a lightweight Bitcoin client, based on a client-server protocol.  It supports Simple Payment Verification (SPV) and deterministic key generation from a seed.  Your
> + secret keys are encrypted and are never sent to other machines/servers.  Electrum does not download the Bitcoin blockchain.
> --8<---------------cut here---------------end--------------->8---
>
> Any clue?

There was an issue with the upgrade of the python-qrcode package from
version 5.3 to 6.0 [1], which meant that the output didn't actually
contain any code [2], hence the error you are seeing.

I've just pushed a fix to the package [3], so if you update Guix (by
running guix pull, or otherwise) and then upgrade electrum, that should
resolve the issue.

1: d1f1a7a0b15bddb05ac4b0e817e9ad855982df11: gnu: python-qrcode: Update
to 6.0.

2:
/gnu/store/i1s4hay6sxl4rfagk12d1i89za432vyb-python-qrcode-6.0
├── lib
│   └── python3.6
│       └── site-packages
│           └── UNKNOWN-0.0.0-py3.6.egg-info
│               ├── dependency_links.txt
│               ├── PKG-INFO
│               ├── SOURCES.txt
│               └── top_level.txt
└── share
    ├── doc
    │   └── python-qrcode-6.0
    │       └── LICENSE
    └── man
        └── man1
            └── qr.1.gz

9 directories, 6 files

3: d6ed49ba3fbcb6ae522acb3757f93ca8da01648f: gnu: python-qrcode: Use a
newer version of setuptools.