How to build a function to add items to different tables - variables

Question

I currently have several functions that do the same thing. Each function add a value to a different table. I have a subject table, a format table, a studio table, a language table etc.. Each has its own function to add to it. These tables are then used to pull their values into separate dropdowns (GUI).
I would like to create a single function that insert values into each of these tables. I use lambda to pass the name of the column. With this I add an 's' to name the table (each table have the same name as the column but plural). Then I use the variable in different place in the function.
If I take the "subject" function. The database table is called "subjects," the column is called "subject" and the input box on the GUI is called "subject_add." Therefore to pull the value from the input box I use "subject_add.get()" Same for all other dropdowns but with different wording.
What I don't know is how to make the "subject_add.get()" work if I use a variable for the word "subject." I have here the function I am currently working on.
def add_to_dropdown(column):
table_name = column + "s"
element = column + "_add.get()"
if element:
conn = sqlite3.connect(conndb.data_source)
c = conn.cursor()
c.execute(f'INSERT INTO {table_name}({column}) VALUES (?)', (element,))
messagebox.showinfo("Interest", f"A new {column} has been added to the database")
conn.commit()
c.close()
conn.close()
else:
messagebox.showwarning("Warning", f"{column} field is empty!")
column_add.delete(0, tk.END)
The table_name variable looks fine. The element variable looks fine, but the "if element:" won't work, as well as the "element" in the SQL INSERT command.
Here is the button with it's lambda command that passes the word "subject" to the function.
subject_add_btn = ttk.Button(frame_add_items, text="add ", style='a.TButton', image=arrow, compound=tk.RIGHT, command=lambda: add_to_dropdown("subject"))
subject_add_btn.place(x=480, y=50, height=35, width=90)
Hopefully, this makes sense to you. It's not very easy to explain in words. It's easier to show the code.

Answer 1

To resolve the issue is used the eval() functions. Here are the changes I made for it to work well:
def add_to_dropdown(column):
# This function handle all dropdown
table_name = column + "s"
element = column + "_add.get()"
if eval(element):
conn = sqlite3.connect(conndb.data_source)
c = conn.cursor()
c.execute(f'INSERT INTO {table_name}({column}) VALUES (?)', (eval(element),))