doesn't work in Flask

[mpourvali]

@app.route("/query", methods= ["GET", 'POST'])
def query():
pysqldf = lambda q: sqldf(q, locals())
csv_data = pd.read_csv('./for_download/for_query.csv', index_col=[0])
query = "select * from csv_data"
trows = pysqldf(query)

I can't get the table in this way, and face this error:
pandasql.sqldf.PandaSQLException: (sqlite3.OperationalError) no such table: csv_data

[mpourvali]

it also doesn't work with globals()