CODEWITHSUNDEEP
pythonpython-3.x
Bogdan
Bogdan

Reputation: 185

How to access the key values in a nested python dictionary with variables?

I am cleaning up some ROS robot code using the method in this QA. This is not ROS related.

Here is the original code:

 data = []
 data.append(sensor[thermo].data.thermo)
 data.append(sensor[imu].data.imu.x)
 data.append(sensor[imu].data.imu.rotation.x)

Now I have a list of tuples containing all the topics so I can loop around:

topics = [('thermo', 'thermo'),
          ('imu', 'imu.x')
          ('imu', 'imu.rotation.x')]

and:

for sensor, topic in topics:
    data.append(getattr[sensor].data, topic)

This works for thermo, but not for imu, and I am getting the following error:

AttributeError: 'imu' object has no attribute 'x'

How can I fix the getattr statement to achieve the goal here?

Upvotes: 0

Views: 132

Answers (1)

machine424
machine424

Reputation: 155

The function reduce of functools can be used:

reduce(getattr, "att1.att2.att3".split('.'), sensor[imu])

Upvotes: 1

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