ImportError: No module named numpy

[romdos]

Hello everyone! I have the next trouble:
when I run rqt_bag bag-file
I get the next error:
RosPluginProvider.load(rqt_bag_plugins/BagPlotPlugin) exception raised in builtin.import(rqt_bag_plugins.plot_plugin, [PlotPlugin]):
Traceback (most recent call last):
File "/opt/ros/kinetic/lib/python2.7/dist-packages/rqt_gui/ros_plugin_provider.py", line 77, in load
module = builtin.import(attributes['module_name'], fromlist=[attributes['class_from_class_type']], level=0)
File "/opt/ros/kinetic/lib/python2.7/dist-packages/rqt_bag_plugins/plot_plugin.py", line 35, in
from .plot_view import PlotView
File "/opt/ros/kinetic/lib/python2.7/dist-packages/rqt_bag_plugins/plot_view.py", line 77, in
from rqt_plot.data_plot import DataPlot
File "/opt/ros/kinetic/lib/python2.7/dist-packages/rqt_plot/data_plot/init.py", line 34, in
import numpy
ImportError: No module named numpy

How can I fix it? I tried pip install numpy but no luck. Any help!

[romdos]

sudo pip install numpy solved this issue

[dirk-thomas]

Thanks for the report. It looks like that numpy was added in #239 but the dependency was not declared in the manifest. I created #396 to fix that.

In general you should not install dependencies using pip but via apt instead (in this case python-numpy). Simply because your apt packages can be updated as part of a declared dependency and the pip packages won't get updated and even overlay a potentially newer version installed from Debian packages. So using pip package is asking for trouble in the future.