อ่าน CSV ด้วย pandas

import pandas as pd
from io import StringIO

csv_text = "name,score\nAda,95\nLin,88\nSam,91"
students = pd.read_csv(StringIO(csv_text))

print(students)

import pandas as pd

sales = pd.read_csv(
    "sales.csv",
    usecols=["order_date", "product", "quantity", "revenue"],
    parse_dates=["order_date"],
    dtype={"product": "string", "quantity": "Int64"},
    na_values=["", "N/A", "unknown"],
)

sales = sales.dropna(subset=["order_date", "product"])
monthly_revenue = sales.groupby(
    sales["order_date"].dt.to_period("M")
)["revenue"].sum()

print(monthly_revenue)