Is there anyway to way to use an input variable as a function call?

Question

In my current situation, I am trying to build an application that utilizes the Web3.py Python module. The main issue that I am encountering when trying to turn my script into a full stack application is that the function calls in Web3 contracts are not all the same.

For Example:

w3 = Web3(Web3.HTTPProvider('https://mainnet.infura.io'))
abi_endpoint = 'https://api.etherscan.io/api?module=contract&action=getabi&address='
project_address = '0x8a90CAb2b38dba80c64b7734e58Ee1dB38B8992e'

url = ABI_ENDPOINT + project_address
response = requests.get(url)
response = response.json()
abi = json.loads(response['result'])  

contract = w3.eth.contract(address=project_address, abi=abi)

total_supply = contract.functions.totalSupply().call()

I am wanting to be able to put an input variable when I call totalSupply(). The main reason I need to do this is since a lot of the contracts do not have the same function names. For instance, it could be totalApes(), MAX_SUPPLY(), or anything similar. I am just looking for a way to be able to change these things on the front-end rather than having to go change the code every time I am trying to use it.

Answer 1

I'm not really addressing your sample code but by the sounds of your question I think looking at this may help?

def func1():
    print("foo")

def func2():
    print("bar")

def func3(f):
    f()

func3(func1)#prints foo
func3(func2)#prints bar

#A little more risky

def func4(s):
    f = eval(s)
    f()

func4("func1")#prints foo
func4("func2")#prints bar

Note that using eval is generally considered a security vulnerability and should only be used in select circumstances.

Answer 2

You need to use get_function_by_name() method together with the exec statement.

For example if you want to loop on the state function doFoo() doBar() doBaz() you would do:

for i in ['doFoo','doBar','doBaz']:
    exec(f"var{i} = contract.get_function_by_name('{i}')")

You'll get your results in var_doFoo, var_doBar and var_doBaz