Python–累积记录产品
有时，在处理记录形式的数据时，我们可能会遇到一个问题，即我们需要找到收到的所有记录的产品元素。这是数据科学领域中非常常见的应用。让我们讨论执行这项任务的某些方法。 方法#1:使用循环+生成器表达式 这是实现解决这个任务最基本的方法。在本文中，我们使用生成器表达式迭代整个嵌套列表，并使用显式乘积函数获得乘积元素。
Python 3
# Python3 code to demonstrate working of
# Cumulative Records Product
# using loop + generator expression
# getting Product
def prod(val) :
res = 1
for ele in val:
res *= ele
return res
# initialize list
test_list = [(2, 4), (6, 7), (5, 1), (6, 10), (8, 7)]
# printing original list
print("The original list : " + str(test_list))
# Cumulative Records Product
# using loop + generator expression
res = prod(int(j) for i in test_list for j in i)
# printing result
print("The Cumulative product of list is : " + str(res))
Output
The original list : [(2, 4), (6, 7), (5, 1), (6, 10), (8, 7)]
The Cumulative product of list is : 5644800
方法 2:使用 loop+map()+chain . from _ iterable() 以上方法的组合也可以用来执行这个任务。在这种情况下，通过 map()和 from_iterable()的组合来扩展查找乘积。
Python 3
# Python3 code to demonstrate working of
# Cumulative Records Product
# using product + map() + chain.from_iterable()
from itertools import chain
# getting Product
def prod(val) :
res = 1
for ele in val:
res *= ele
return res
# initialize list
test_list = [(2, 4), (6, 7), (5, 1), (6, 10), (8, 7)]
# printing original list
print("The original list : " + str(test_list))
# Cumulative Records Product
# using product + map() + chain.from_iterable()
res = prod(map(int, chain.from_iterable(test_list)))
# printing result
print("The cumulative product of list is : " + str(res))
Output
The original list : [(2, 4), (6, 7), (5, 1), (6, 10), (8, 7)]
The cumulative product of list is : 5644800
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