CODEWITHSUNDEEP
pythonclassmethods
jmdeamer
jmdeamer

Reputation: 335

Constructing a method name

How do I construct a method name to use with an instantiated class? I'm trying to run a method in a class 'jsonmaker' where the method corresponds to the datatype specified in the filein string.

for filein in filein_list:
    datatype = filein[(filein.find('_')):-8]
    method_name = pjoin(datatype + 'populate')
    instantiated_class.method_name(arg1, arg2, arg3)

When I try the above code I get the error message 

'AttributeError: 'jsonmaker' object has no attribute 'method_name''

There is in fact a method in jsonmaker that matches pjoin(datatype + 'populate') so how do I tell the class to recognize that? Sorry if I'm not explaining this well.

Upvotes: 1

Views: 44

Answers (1)

Moses Koledoye
Moses Koledoye

Reputation: 78564

You can't reference the attribute of a class instance by putting a variable directly behind a dot reference. Not even when the variable references a string which is same as the name of the attribute.

You could instead use getattr to get the method from the string and then call it with those parameters:

getattr(instantiated_class, method_name)(arg1, arg2, arg3)

Upvotes: 2

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