Python use variable as object attribute-CodePudding

I am trying to use the following code:

def find_unknown_val(field, value, unknown_val):
temp_df = get_frame(field, value)
return temp_df.iloc[0].str(unknown_val)

print(find_unknown_val('Member_Name','McCarron,John','Supervisor_Name'))

This brings an error ans says TypeError: 'StringMethods' object is not callable, however it works when I use

def find_unknown_val(field, value, unknown_val):
temp_df = get_frame(field, value)
return temp_df.iloc[0].Supervisor_Name

In other words I need to pass a variable to be used as an object attribute, any Idea how to do this?

CodePudding user response：

The dot for attribute access is syntax, not an operator. You need an identifier following the dot, not an arbitrary expression.

Use getattr instead:

return getattr(temp_df.iloc[0], unknown_val)

CodePudding user response：

You can use f strings

def find_unknown_val(field, value, unknown_val):
    temp_df = get_frame(field, value)
    return temp_df.iloc[0][f"{unknown_val}"]