Unable to dynamically assign db collections path

[anbuchelva]

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I tried to get the existing values from the firebase db using this following code, which works fine.

existing_data = db.child('account_group').child(new_member).get().val()

However, if i change it to dynamically assign the path of db it doesn't work.

member_path = db.child('account_group')
existing_data = member_path.child(new_member).get().val()

Is there a way to fix?