Substituting Variable' values in Python during function call.

Question

In my python program, I have to call a function like this one:

driver_name.project.paired_config_L1_M_10g()

What function I call depends on the value that I have stored in three variables, namely:

varA == M 
varB == L1 
varC = 10g

varA, varB, and varC can have about 20 different values each, and I don't want to write a function call for each one of them (Albeit the actual function definition exists.) Typically I want to function call to be:

driver_name.project.paired_config_$varA_$varB_$varC()

But this does not seem to work. Suggestions?

Does this object really have 8000 methods on it? It looks like these methods should just be 1 method that takes 3 arguments. — user2357112
– user2357112, Commented Apr 13, 2014 at 6:29

zaquest · Accepted Answer · 2014-04-13 06:26:26Z

1

You can use getattr. It takes object and attribute name as a string and returns the attribute. Here the returned value is a method, that could be immediately called.

getattr(driver_name.project, 'project_config_%s_%s_%s' % (varA, varB, varC))()

answered Apr 13, 2014 at 6:26

zaquest

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Jay Atkinson · Accepted Answer · 2014-04-13 06:25:10Z

0

Have you considered a dictionary as one possible solution?

Just initialize the dictionary with the proper keys (varA,varB,varC) and the define functions. Then call it.

driver_func_dict['ML110g'] = driver_name.project.paired_config_M_L1_10g
#init more dictionary items here
...

#call function
driver_funct_dict[str(varA)+str(varB)+str(varC)]()

answered Apr 13, 2014 at 6:25

Jay Atkinson

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