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10个常用的python lambda函数（python的lambda函数用法）

off999 2024-09-27 13:51 30 浏览 0 评论

在Python中，lambda函数因其简洁性常用于简单的、即用即抛的场景，尤其是配合高阶函数如map()、filter()、sorted()等使用。下面是10个常用的lambda函数示例：

加倍每个元素:
Python1double = lambda x: x * 2
2numbers = [1, 2, 3, 4]
3doubled = list(map(double, numbers))
字符串转大写:
Python1to_upper = lambda s: s.upper()
2texts = ["hello", "world"]
3uppercase_texts = list(map(to_upper, texts))
计算平方:
Python1square = lambda x: x ** 2
2squares = list(map(square, range(5)))
筛选偶数:
Python1is_even = lambda x: x % 2 == 0
2even_numbers = list(filter(is_even, range(10)))
按长度排序字符串列表:
Python1sort_by_length = lambda s: len(s)
2sorted_texts = sorted(["apple", "fig", "banana"], key=sort_by_length)
计算两个数之和:
Python1add = lambda x, y: x + y
2sum_of_two = add(3, 4)
取绝对值:
Python1absolute_value = lambda x: abs(x)
2abs_values = list(map(absolute_value, [-2, -1, 0, 1, 2]))
判断素数:
Python1is_prime = lambda n: all(n % i for i in range(2, int(n**0.5) + 1)) and n > 1
2primes = list(filter(is_prime, range(2, 20)))
字符串拼接:
Python1concat = lambda x, y: x + y
2combined = list(map(concat, ["Hello ", "World ", "from "], ["Python!", "Lambda.", ""]))
计算平均值:
Python1avg = lambda iterable: sum(iterable) / len(iterable) if iterable else 0
2numbers_avg = avg([10, 20, 30])