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🐍 Daily Python Problem: Find a Simple Repeat 💖

Today we meet the Daily Python Problem: find a duplicate! ✨

The problem is to write the find _ common _ elements function (list1, list2) that will be returned as a new list that only appears on both lists.

There are three ways to write the code:

1. Basic (Loop): This method is easy and straightforward for beginners.

2.Pythonic (Use List Comprehension): Short, concise, popular for Python writers!

3. Pro (Use Set): This method is the fastest (especially with big lists) because it uses the Set feature to find the Intersection (duplicate part) with a sign & then convert it back to list!

Let's take a few examples:

• Input: find _ common _ elements ([1, 2, 3, 4], [3, 4, 5, 6])

• Output: [3, 4]

Try to practice writing together. Finding the duplicate part is used very often! 👩‍💻

Keep going. 🥰

# python # programmer # data aanalyst # ai # learnonlemon8

2025/11/9 Edited to

... Read moreการหาค่าที่ซ้ำกันใน list สองชุดถือเป็นโจทย์พื้นฐานที่สำคัญใน Python รวมถึงการจัดการข้อมูลอย่างมีประสิทธิภาพ ในบทความนี้เราจะพูดถึงฟังก์ชัน find_common_elements ที่ช่วยให้คุณสามารถส่งค่า list สองชุดเข้าไป แล้วจะได้ list ใหม่ที่มีสมาชิกที่พบในทั้งสอง list เท่านั้น ซึ่งเหมาะสำหรับการวิเคราะห์ข้อมูล การจัดการชุดข้อมูล หรืองานทั่วไปที่ต้องการหาส่วนที่ทับซ้อนกันของข้อมูล วิธีที่แนะนำมี 3 แบบด้วยกัน: แบบพื้นฐานใช้ loop และ if ซ้อนกัน ซึ่งเป็นวิธีที่เข้าใจง่ายสำหรับมือใหม่ การใช้ list comprehension ที่ทำให้โค้ดสั้นและอ่านง่ายขึ้น รวมถึงวิธีโปรหากใช้ set เพราะ set จะจัดการเรื่องการหาค่าที่ซ้ำซ้อนอย่างรวดเร็ว โดยใช้ Intersection (&) และแปลงกลับเป็น list ทำให้การทำงานกับ list ที่มีข้อมูลเยอะมีประสิทธิภาพสูงสุด นอกจากนี้ ยังควรเข้าใจข้อดีข้อเสียของแต่ละวิธี เช่น การใช้ loop อาจช้าเมื่อ list ใหญ่ ในขณะที่ set อาจสูญเสียลำดับของข้อมูล แต่เร็วในการคำนวณ ส่วน list comprehension รวมข้อดีของความกระชับและอ่านง่าย เหมาะสำหรับงานทั่วไป ตัวอย่างเช่น Input: find_common_elements([1, 2, 3, 4], [3, 4, 5, 6]) Output: [3, 4] โค้ดง่าย ๆ ช่วยเสริมความเข้าใจและพัฒนาทักษะการเขียน Python ให้ดียิ่งขึ้น คุณสามารถนำฟังก์ชันนี้ไปประยุกต์ใช้ในโปรแกรมอื่น ๆ ได้หลากหลาย เช่น การกรองข้อมูล การจัดการข้อมูลจากฐานข้อมูล หรือการทำ Data Analysis อย่าลืมฝึกฝนเขียนโค้ดอย่างสม่ำเสมอ และลองใช้ฟังก์ชัน find_common_elements กับชุดข้อมูลหลายรูปแบบ จะช่วยให้คุณเข้าใจนิยามของ set, list และการทำงานของ loop มากขึ้น ทั้งนี้ การเลือกวิธีใช้ขึ้นกับความเหมาะสมของการใช้งานแต่ละงานและลักษณะข้อมูลที่ต้องประมวลผล

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