How to put string for attribute to function

Question

I need help with function attribute in Python. I have the data which look like this: exch1 = data['Info']['Exchange1'] and this equals for example poloniex. I need to get exch1_object which must look like this ccxt.poloniex(), But when I try to do it I get the error:

AttributeError: module 'ccxt' has no attribute 'str'

import ccxt
exch1 = data['Info']['Exchange1']
exch2 = data['Info']['Exchange2']
exch1_object = exch1.lower()
exch1_object = ccxt.str(exch1_object)()

Answer 1

You could try to use getattr():

# 'exch1_object' should be a string
func = getattr(ccxt, exch1_object)
exch1_object = func()

This will get the function from the module ccxt that has the name that is currently inside the variable exch1_object (which should be a string).

This can also be shortened to this:

exch1_object = getattr(ccxt, exch1_object)()

you will have to decide which is clearer and more readable for your case.

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So, for example, these lines:

exch1_object = 'poloniex'
exch1_object = getattr(ccxt, exch1_object)()

will yield the same results as:

exch1_object = ccxt.poloniex()