Fix function argument data type as dataframe python-CodePudding

Let say I have a function

def func(data:str):  
   pass

what i want to make it accept dataframe as well along with string. How can i do? It mean if string passed it accept and if dataframe it also accept that.

CodePudding user response：

import typing
import pandas as pd
def func(data:typing.Union[str, pd.DataFrame]):  
   pass

or, if you use python 3.10 or newer:

def func(data:str | pd.DataFrame):  
   print(type(data))

for more information and future reader:

this is type-hinting and does not do anything about accept or deny any type even if you specify only one type. for more strictness and that the function can't accpet any other types, you must use raise:

def func(data):  
    if type(data) not in [str, pd.DataFrame]:
        raise RuntimeError("This is not good")

even this lenient let you to use strings as type-hinting, for example:

def func(data: "str"):  
    print(data)

and, also as you can see in first example, you can use any class for type-hinting, and this is a good practice.