PyQt4 and Python 3.4 from conda-forge

In a fresh environment, I am getting an ImportError with PyQt4 and Python 3.4. The same error does not occur in a fresh environment with PyQt4 and Python 3.5. It would appear that icu is not properly being included in dependencies somewhere for the Python 3.4 version. Is this a simple (hah, “simple”) fix, where we just need to add icu to the run requirements of one of these packages?

condarc:

$ cat ~/.condarc
always_yes: true
binstar_upload: false
channels: 
- conda-forge
#- lightsource2-dev
#- lightsource2
- defaults
show_channel_urls: true
allow_softlinks: False

track_features:
- nomkl

Python 3.4

$ conda create -p /tmp/qt34 python=3.4 pyqt
Using Anaconda Cloud api site https://api.anaconda.org
Fetching package metadata .........
Solving package specifications: ..........

Package plan for installation in environment /tmp/qt34:

The following NEW packages will be INSTALLED:

    ca-certificates: 2016.2.28-1   conda-forge (copy)
    fontconfig:      2.11.1-3      conda-forge (copy)
    freetype:        2.6.3-1       conda-forge (copy)
    libiconv:        1.14-2        conda-forge (copy)
    libpng:          1.6.21-1      conda-forge (copy)
    libxml2:         2.9.2-0       defaults    (copy)
    ncurses:         5.9-7         conda-forge (copy)
    openssl:         1.0.2h-0      conda-forge (copy)
    pip:             8.1.2-py34_0  defaults    (copy)
    pyqt:            4.11.4-py34_3 defaults    (copy)
    python:          3.4.4-5       defaults    (copy)
    qt:              4.8.7-3       defaults    (copy)
    readline:        6.2-0         conda-forge (copy)
    setuptools:      23.0.0-py34_0 defaults    (copy)
    sip:             4.18-py34_0   conda-forge (copy)
    sqlite:          3.13.0-1      conda-forge (copy)
    tk:              8.5.18-0      defaults    (copy)
    wheel:           0.29.0-py34_0 defaults    (copy)
    xz:              5.2.2-0       conda-forge (copy)
    zlib:            1.2.8-3       conda-forge (copy)

Linking packages ...
[      COMPLETE      ]|###########################################################################################################################################| 100%
#
# To activate this environment, use:
# $ source activate /tmp/qt34
#
# To deactivate this environment, use:
# $ source deactivate
#

activate it

$ source activate /tmp/qt34
prepending /tmp/qt34/bin to PATH

try to import qtgui and get the failure

$ python -c "from PyQt4 import QtGui"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: libicui18n.so.56: cannot open shared object file: No such file or directory

install icu

$ conda install icu
Using Anaconda Cloud api site https://api.anaconda.org
Fetching package metadata .........
Solving package specifications: ..........

Package plan for installation in environment /tmp/qt34:

The following NEW packages will be INSTALLED:

    icu: 56.1-3 conda-forge (copy)

Linking packages ...
[      COMPLETE      ]|###########################################################################################################################################| 100%

and no more error

$ python -c "from PyQt4 import QtGui"

Python 3.5

create the fresh environment

$ conda create -p /tmp/qt35 python=3.5 pyqt
Using Anaconda Cloud api site https://api.anaconda.org
Fetching package metadata .........
Solving package specifications: ..........

Package plan for installation in environment /tmp/qt35:

The following NEW packages will be INSTALLED:

    ca-certificates: 2016.2.28-1   conda-forge (copy)
    fontconfig:      2.11.1-3      conda-forge (copy)
    freetype:        2.6.3-1       conda-forge (copy)
    icu:             56.1-3        conda-forge (copy)
    libiconv:        1.14-2        conda-forge (copy)
    libpng:          1.6.21-1      conda-forge (copy)
    libxml2:         2.9.3-8       conda-forge (copy)
    ncurses:         5.9-7         conda-forge (copy)
    openssl:         1.0.2h-0      conda-forge (copy)
    pip:             8.1.2-py35_0  defaults    (copy)
    pyqt:            4.11.4-py35_3 defaults    (copy)
    python:          3.5.1-0       conda-forge (copy)
    qt:              4.8.7-3       defaults    (copy)
    readline:        6.2-0         conda-forge (copy)
    setuptools:      23.0.0-py35_0 defaults    (copy)
    sip:             4.18-py35_0   conda-forge (copy)
    sqlite:          3.9.2-0       conda-forge (copy)
    tk:              8.5.19-0      conda-forge (copy)
    wheel:           0.29.0-py35_0 defaults    (copy)
    xz:              5.0.5-1       conda-forge (copy)
    zlib:            1.2.8-3       conda-forge (copy)

Linking packages ...
[      COMPLETE      ]|###########################################################################################################################################| 100%
#
# To activate this environment, use:
# $ source activate /tmp/qt35
#
# To deactivate this environment, use:
# $ source deactivate
#

activate the fresh environment

$ sa /tmp/qt35
prepending /tmp/qt35/bin to PATH

and import qtgui with no problem

$ python -c "from PyQt4 import QtGui"

[ericdill]

Nope. Things are working just fine now.

$ conda create -p /tmp/qt34 pyqt python=3.4

<snip> 

The following NEW packages will be INSTALLED:

    ca-certificates: 2017.1.23-0      conda-forge
    cairo:           1.14.6-4         conda-forge
    certifi:         2017.1.23-py34_0 conda-forge
    fontconfig:      2.12.1-4         conda-forge
    freetype:        2.7-1            conda-forge
    gettext:         0.19.7-1         conda-forge
    glib:            2.51.4-0         conda-forge
    graphite2:       1.3.9-0          conda-forge
    harfbuzz:        1.4.3-0          conda-forge
    icu:             58.1-1           conda-forge
    jpeg:            9b-0             conda-forge
    libffi:          3.2.1-3          conda-forge
    libiconv:        1.14-4           conda-forge
    libpng:          1.6.28-0         conda-forge
    libtiff:         4.0.6-7          conda-forge
    libxml2:         2.9.4-4          conda-forge
    ncurses:         5.9-10           conda-forge
    openssl:         1.0.2h-3         conda-forge
    pango:           1.40.4-0         conda-forge
    pcre:            8.39-0           conda-forge
    pip:             9.0.1-py34_0     conda-forge
    pixman:          0.34.0-0         conda-forge
    pyqt:            4.11.4-py34_2    conda-forge
    python:          3.4.5-2          conda-forge
    qt:              4.8.7-7          conda-forge
    readline:        6.2-0            conda-forge
    setuptools:      32.3.1-py34_0    conda-forge
    sip:             4.18-py34_1      conda-forge
    sqlite:          3.13.0-1         conda-forge
    tk:              8.5.19-1         conda-forge
    wheel:           0.29.0-py34_0    conda-forge
    xz:              5.2.2-0          conda-forge
    zlib:            1.2.11-0         conda-forge

<snip>

$ source activate /tmp/qt34
$ python -c "import PyQt4"

Works just fine now.

[ericdill]

IIUC…

• The problem with PyQt4 is a pinning problem with libxml2
• icu is behaving properly on linux