[Python] How to pass a dataframe variable to a function in python

I have a spss dataset that i'm importing into python.

Next i want is to validate the data. I have written some function to do the same but when i pass the variable error occurs.

Can somebody please guide me through it.

df,meta=pyreadstat.read_sav("SL_2025.sav")

def single_check(single):
if df['single'].isnull():
print("Missing values")
if df['single'] not in range(18,121):
print("Range error")
else:
print("Data is correct")


single_check('hCurrAge')

Here hCurrAge is a variable with values ranging from 20 to 120

I want to know how do i pass a variable as a argument in a function

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