一文详解Python中Reduce函数轻松解决复杂数据聚合

from functools import reduce
# 二元操作函数：求两个数的和
def add(x, y):
 return x + y
 # 要进行操作的可迭代对象
numbers = [1, 2, 3, 4, 5]
# 使用reduce()函数求可迭代对象中所有元素的和
result = reduce(add, numbers)
print("Sum of numbers:", result)  # 输出：Sum of numbers: 15

from functools import reduce
import operator
numbers = [1, 2, 3, 4, 5]
# 使用reduce()函数求累加和
sum_result = reduce(operator.add, numbers)
print("Sum of numbers:", sum_result)  # 输出：Sum of numbers: 15
# 使用reduce()函数求累乘
product_result = reduce(operator.mul, numbers)
print("Product of numbers:", product_result)  # 输出：Product of numbers: 120

from functools import reduce
import operator
numbers = [1, 2, 3, 4, 5]
# 不指定初始值
result1 = reduce(operator.add, numbers)
print("Result without initial value:", result1)  # 输出：Result without initial value: 15
# 指定初始值为10
result2 = reduce(operator.add, numbers, 10)
print("Result with initial value:", result2)  # 输出：Result with initial value: 25

from functools import reduce
words = ["Hello", " ", "Python", "!"]
# 使用reduce()函数将列表中的元素连接成一个字符串
result = reduce(lambda x, y: x + y, words)
print("Concatenated string:", result)  # 输出：Concatenated string: Hello Python!

from functools import reduce
# 自定义函数：将列表中的奇数元素相乘
def multiply_odd_numbers(x, y):
 if y % 2 == 1:
     return x * y
 return x
numbers = [1, 2, 3, 4, 5]
# 使用reduce()函数结合自定义函数求奇数元素的乘积
result = reduce(multiply_odd_numbers, numbers)
print("Product of odd numbers:", result)  # 输出：Product of odd numbers: 15

from functools import reduce
numbers = [1, 2, 3, 4, 5]
# 使用reduce()函数结合lambda函数求累加和
sum_result = reduce(lambda x, y: x + y, numbers)
print("Sum of numbers:", sum_result)  # 输出：Sum of numbers: 15
# 使用reduce()函数结合lambda函数求累乘
product_result = reduce(lambda x, y: x * y, numbers)
print("Product of numbers:", product_result)  # 输出：Product of numbers: 120

from functools import reduce
numbers = [5, 8, 2, 10, 3]
# 使用reduce()函数结合lambda函数求列表中的最大值和最小值
max_value = reduce(lambda x, y: x if x > y else y, numbers)
min_value = reduce(lambda x, y: x if x < y else y, numbers)
print("Max value:", max_value)  # 输出：Max value: 10
print("Min value:", min_value)  # 输出：Min value: 2

from functools import reduce
words = ["Hello", " ", "Python", "!"]
# 使用reduce()函数结合lambda函数将字符串列表拼接成一个字符串
result = reduce(lambda x, y: x + y, words)
print("Concatenated string:", result)  # 输出：Concatenated string: Hello Python!

from functools import reduce
numbers = [1, 2, 3, 4, 5]
# 使用reduce()函数结合lambda函数将列表元素相加得到整数
result = reduce(lambda x, y: x * 10 + y, numbers)
print("Concatenated number:", result)  # 输出：Concatenated number: 12345