Allowing modules to override same named functions

When constructing the Driver, we can import several modules:

from hamilton import driver
import module_A
import module_B

dr = driver.Builder().with_modules(module_A, module_B)

Now, it can happen that module_A and module_B both have a python function with the same name but performing different things:

# module_A
import pandas as pd


def weighted_average(data: pd.Series, weight: int) -> pd.Series:
    return weight * data.mean()

# module_B
import pandas as pd


def weighted_average(data: pd.Series, weight: int) -> pd.Series:
    return data.mean() / weight

In this case Apache Hamilton will raise an error since we cannot have two same named functions in the DAG.

We have a handy flag for you to allow the later imported module to overwrite the previous same-named functions:

dr = driver.Builder().with_modules(module_A, module_B).allow_module_overrides()

which will tell Apache Hamilton to use module_B.weighted_average() for the node and ignore the same-named function from module_A.