call member functions and pass arguments with map function in python

Question

Based on what I see in this post, I tried to write this piece of code but it gives me error.

ticklabels = ax.get_xticklabels()
set_color = operator.methodcaller('set_color("b")')
ticklabels[0].set_color('b') # this runs fine
map(set_color, ticklabels)   #error is here

Error code:

map(set_color, ticklabels) AttributeError: 'Text' object has no attribute 'set_color("b")'

Can't you pass argument to the function in methodcaller?

@halex, yes your code also works and it is mentioned in the referred post. I just did not want to use lambda. Thanks for mentioning that. — rowman
– rowman, Commented Oct 10, 2012 at 10:25
The lambda variant should be map(lambda x: x.set_color('b'), ticklabels) — Matthew Trevor
– Matthew Trevor, Commented Oct 11, 2012 at 0:37

Matthew Trevor · Accepted Answer · 2012-10-10 10:20:05Z

2

I think you need:

set_color = operator.methodcaller('set_color', 'b')

The first argument is the method to be called, subsequent arguments will be passed to the method when it is called.

You can then test it works by doing:

set_color(ticklabels[0])

edited Oct 10, 2012 at 10:20

answered Oct 10, 2012 at 10:13

Matthew Trevor

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1 Comment

rowman Over a year ago

Yes, did not read the documentation for the methodcaller. It is mentioned there.

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