feat: python

20-24/lianxi-Lambda.py

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+# Lambda函数，也称为匿名函数，是Python中一种轻量级、简洁的函数定义方式。与常规的def函数不同，Lambda函数没有名字，可以在需要短小函数的地方直接使用。
+
+# 基本特点：
+
+# 匿名性：Lambda函数没有函数名
+# 简洁性：通常用于简单的单行表达式
+# 临时性：适合临时使用的功能
+# 函数式编程：与高阶函数配合使用
+
+add = lambda x, y: x + y
+print(add(1, 2))
+
+square = lambda x: x**2
+print(square(2))
+
+# 应用
+# 排序
+words = ["apple", "banana", "cherry", "date", "elderberry"]
+words.sort(key=lambda x: len(x))
+print(words)
+
+# 按字符创长度降序拍
+words = ["apple", "banana", "cherry", "date", "elderberry"]
+words.sort(key=lambda x: len(x), reverse=True)
+print(words)
+
+students = [
+    {"name": "Alice", "age": 20, "grade": 85},
+    {"name": "Bob", "age": 19, "grade": 92},
+    {"name": "Charlie", "age": 21, "grade": 78},
+]
+# 按年龄排序
+students_by_age = sorted(students, key=lambda x: x["age"])
+print(students_by_age)
+# 按成绩排序
+students_by_grade = sorted(students, key=lambda x: x["grade"], reverse=True)
+print(students_by_grade)
+
+
+# 在列表中使用lambda
+numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+squared_numbers = [(lambda x: x**2)(item) for item in numbers]
+print(squared_numbers)
+
+# 进行条件过滤
+large_numbers = [num for num in numbers if (lambda x: x > 5)(num)]
+print(large_numbers)
+
+# 转大写
+texts = ["hello", "world", "python", "programming"]
+upper_texts = [(lambda x: x.upper())(w) for w in texts]
+print(upper_texts)