ตัวกรอง isin() และ between()

ภาพรวมเมธอด isin()

import pandas as pd

df = pd.DataFrame({
    'country': ['USA', 'Germany', 'UK', 'France', 'USA'],
    'sales': [400, 200, 150, 300, 600]
})

# Check membership
mask = df['country'].isin(['USA', 'UK'])
print(mask.tolist())  # [True, False, True, False, True]

result = df[mask]
print(result)
#   country  sales
# 0     USA    400
# 2      UK    150
# 4     USA    600

การใช้ isin() กับเซตเพื่อเพิ่มความเร็ว

import pandas as pd

df = pd.DataFrame({
    'sku': ['A001', 'B002', 'A003', 'C004', 'B005'],
    'qty': [10, 5, 3, 8, 12]
})

# Use a set for fast membership check
allowed_skus = {'A001', 'A003', 'B005'}
result = df[df['sku'].isin(allowed_skus)]
print(result)
#     sku  qty
# 0  A001   10
# 2  A003    3
# 4  B005   12

การปฏิเสธ isin() ด้วย ~

import pandas as pd

df = pd.DataFrame({
    'status': ['active', 'cancelled', 'shipped', 'refunded', 'active'],
    'amount': [100, 200, 300, 150, 500]
})

bad_statuses = ['cancelled', 'refunded']
# Keep all rows NOT in the excluded list
result = df[~df['status'].isin(bad_statuses)]
print(result)
#     status  amount
# 0   active     100
# 2  shipped     300
# 4   active     500

การใช้คอลัมน์ของ DataFrame เป็นรายการให้ isin()

import pandas as pd

orders = pd.DataFrame({
    'order_id': [1, 2, 3, 4, 5],
    'revenue': [100, 200, 300, 400, 500]
})

vip_orders = pd.DataFrame({'order_id': [2, 4]})

# Keep orders whose ID appears in vip_orders
result = orders[orders['order_id'].isin(vip_orders['order_id'])]
print(result)
#    order_id  revenue
# 1         2      200
# 3         4      400

ภาพรวมเมธอด between()

import pandas as pd

df = pd.DataFrame({
    'age': [15, 22, 35, 67, 45, 8]
})

# Select working-age population
result = df[df['age'].between(18, 65)]
print(result)
#    age
# 1   22
# 2   35
# 4   45

การใช้ between() กับพารามิเตอร์ inclusive

import pandas as pd

df = pd.DataFrame({'score': [0, 50, 100, 75, 50]})

# Include only scores strictly between 50 and 100
strict = df[df['score'].between(50, 100, inclusive='neither')]
print(strict)
#    score
# 3     75

# Include 50 but not 100
left_closed = df[df['score'].between(50, 100, inclusive='left')]
print(left_closed)
#    score
# 1     50
# 3     75
# 4     50

การใช้ between() กับคอลัมน์วันที่

import pandas as pd

df = pd.DataFrame({
    'date': pd.to_datetime(['2024-01-01', '2024-06-15', '2024-11-20', '2025-03-01']),
    'value': [10, 20, 30, 40]
})

# Filter rows in the year 2024
result = df[df['date'].between('2024-01-01', '2024-12-31')]
print(result)
#         date  value
# 0 2024-01-01     10
# 1 2024-06-15     20
# 2 2024-11-20     30

การรวม isin() และ between()

import pandas as pd

df = pd.DataFrame({
    'region': ['North', 'South', 'East', 'North', 'West'],
    'revenue': [100, 500, 200, 300, 400]
})

# Rows in North or South regions AND revenue between 200 and 400
result = df[
    df['region'].isin(['North', 'South']) &
    df['revenue'].between(200, 400)
]
print(result)
#    region  revenue
# 3   North      300
# 1   South      500  <- actually excluded (500 > 400)
# 3   North      300

การใช้ isin() กับหลายคอลัมน์ด้วย Any

import pandas as pd

df = pd.DataFrame({
    'tag1': ['python', 'java', 'sql'],
    'tag2': ['sql', 'python', 'go'],
    'topic': ['Database', 'Backend', 'Infra']
})

target_langs = ['python', 'sql']
# Check if either tag column matches
mask = df[['tag1', 'tag2']].isin(target_langs).any(axis=1)
result = df[mask]
print(result)
#      tag1    tag2     topic
# 0  python     sql  Database
# 1    java  python   Backend
# 2     sql      go     Infra

เคล็ดลับด้านประสิทธิภาพ: isin() กับ == หลายเงื่อนไข

import pandas as pd
import numpy as np

# 1 million row DataFrame
df = pd.DataFrame({'id': np.random.randint(0, 10000, size=1_000_000)})

allowed = list(range(0, 500))  # 500 allowed IDs

# isin() is the right approach here — fast hash lookup
result = df[df['id'].isin(allowed)]
print(result.shape)  # around (50000, 1)

ตัวกรองจากโลกจริง: แค็ตตาล็อกสินค้า

import pandas as pd

products = pd.DataFrame({
    'name': ['Laptop', 'Mouse', 'Monitor', 'Keyboard', 'Webcam'],
    'category': ['Computing', 'Accessories', 'Displays', 'Accessories', 'Peripherals'],
    'price': [1200, 25, 300, 80, 150]
})

# Products in Accessories or Peripherals, priced 50-200
eligible = products[
    products['category'].isin(['Accessories', 'Peripherals']) &
    products['price'].between(50, 200)
]
print(eligible)
#        name     category  price
# 3  Keyboard  Accessories     80
# 4    Webcam  Peripherals    150

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