ProgrammingError: ('Expected 0 parameters, supplied 391', 'HY000') with 391 columns using dynamic approach - pandas

Question

I have a dataframe that contains 391 columns and a number of rows. I am trying to push this to a database via pyodbc and using the following command:
cursor = conn.cursor()
cursor.fast_executemany = True
cursor.executemany(
f"INSERT INTO db.tble({', '.join(df.columns.tolist())}) VALUES ({('?,' * len(df.columns))[:-1]})",
list(df.itertuples(index=False, name=None))
)
cursor.commit()
I would have thought this method would be dynamic for a dataframe of any size yet I get the following error:
ProgrammingError: ('Expected 0 parameters, supplied 391', 'HY000')
I am struggling to understand this as the syntax looks correct, ? has been used instead of %s like other answers. Can someone please help.
Thanks

Answer 1

I once wrote a piece of code, where I wanted to create the insert statement dynamically based on number of columns in the data frame:
here is how the insert query would be passed to the database:
INSERT INTO dbo.Table (column1,columns2,column3) VALUES (?,?,?)
and again, the number of columns and values '?' would be required to be created dynamically at runtime based upon the number of columns the data frame had
I wrote the below piece to just write a string (of ?,?,?) and concatenate it with the insert query,
here
df is the dataframe,
symbol_counter would hold the number of columns in the dataframe,
sym_string would be the final string i.e. (?,?,?,?...n) based on the number of columns
symbol = ['?']
sym_string = ''
symbol_counter = int(df.shape[1])-1
word = 0
for word in range(symbol_counter):
# sym_string += str(symbol)
symbol.insert(word, "?")
word+=1
sym_string = (','.join(symbol))
#and then use this variable and concatenate it with the rest of the query as shown below
query = Variable_holding_first_partofthequery + " VALUES (" +sym_string+")"
I know, it's the big way, but that's how I got it to work. Good Luck!