Python Reduce函数的高级用法详解

from functools import reduce

result = reduce(function, sequence[, initial])

from functools import reduce

numbers = [1, 2, 3, 4, 5]

# 使用lambda函数和reduce计算总和
total = reduce(lambda x, y: x + y, numbers)

print("总和:", total)  # 输出: 15

from functools import reduce

numbers = [2, 3, 4, 5]

# 使用lambda函数和reduce计算乘积
product = reduce(lambda x, y: x * y, numbers)

print("乘积:", product)  # 输出: 120

from functools import reduce

numbers = [10, 3, 25, 7, 40]

# 使用lambda函数和reduce查找最大值
max_value = reduce(lambda x, y: x if x > y else y, numbers)

print("最大值:", max_value)  # 输出: 40

from functools import reduce

words = ["Python", "is", "awesome"]

# 使用lambda函数和reduce将字符串连接起来
sentence = reduce(lambda x, y: x + " " + y, words)

print("句子:", sentence)  # 输出: "Python is awesome"

from functools import reduce

def find_minimum(x, y):
    return x if x< y else y

numbers = [45, 12, 67, 8, 31]

min_value = reduce(find_minimum, numbers)

print("最小值:", min_value)  # 输出: 8

from functools import reduce

def remove_duplicates(result, item):
    if item not in result:
        result.append(item)
    return result

numbers = [1, 2, 2, 3, 4, 4, 5]

unique_numbers = reduce(remove_duplicates, numbers, [])

print("去重后的列表:", unique_numbers)  # 输出: [1, 2, 3, 4, 5]

from functools import reduce

def map_function(func, sequence):
    return reduce(lambda acc, item: acc + [func(item)], sequence, [])

numbers = [1, 2, 3, 4, 5]

# 使用map_function模拟map
squared_numbers = map_function(lambda x: x**2, numbers)

print("平方后的列表:", squared_numbers)  # 输出: [1, 4, 9, 16, 25]