检查数据框列值中是否存在用户输入

Question

Example SQL query: my_query = SELECT a.fruits, a.colors FROM table1

Table

    a.fruits    a.colors

     apple      red

     grapes     purple

     mango      yellow

DF

       fruits    colors

1      apple      red

2      grapes    purple

3      mango     yellow

cursor = conn.cursor()
cursor.execute(my_query)
df = pd.DataFrame(cursor.fetchall(),columns(['fruits','colors']))

user = args.add.lower()
conn.close()

<How can I query the dataframe, to check if the user input exists in the df?>

parser = argparse.ArgumentParser()
group = parser.add_mutually_exclusive_group(required=True)
group.add_argument('-a','--add')
args = parser.parse_args()

User input python3 -a grapes

Expected output if it exist: grapes, purple

Answer 1

Are you looking for something like:

import argparse
import pandas as pd
from sqlalchemy import create_engine

parser = argparse.ArgumentParser()
group = parser.add_mutually_exclusive_group(required=True)
group.add_argument('-a','--add', dest='fruit')
args = parser.parse_args()

qs = "SELECT fruits,colors FROM table1 WHERE fruits = :fruit"

engine = create_engine('sqlite:///data.db')
df = pd.read_sql(qs, engine, params=vars(args))
print(df)

Output:

[...]$ python db.py -a grapes
   fruits  colors
0  grapes  purple