Python程序在元组列表中查找具有正元素的元组

给定一个元组列表。任务是获取所有具有所有正元素的元组。

例子：

Input : test_list = [(4, 5, 9), (-3, 2, 3), (-3, 5, 6), (4, -6)] 
Output : [(4, 5, 9)] 
Explanation : Extracted tuples with all positive elements.

Input : test_list = [(-4, 5, 9), (-3, 2, 3), (-3, 5, 6), (4, -6)] 
Output : [] 
Explanation : No tuple with all positive elements. 

方法 #1：使用列表理解 + all()

在此，all() 用于检查所有元组，列表理解有助于元组的迭代。

Python3

# Python3 code to demonstrate working of
# Positive Tuples in List
# Using list comprehension + all()
 
# initializing list
test_list = [(4, 5, 9), (-3, 2, 3), (-3, 5, 6), (4, 6)]
 
# printing original list
print("The original list is : " + str(test_list))
 
# all() to check each element
res = [sub for sub in test_list if all(ele >= 0 for ele in sub)]
 
# printing result
print("Positive elements Tuples : " + str(res))

输出
原始列表是：[(4, 5, 9), (-3, 2, 3), (-3, 5, 6), (4, 6)]
正元素元组：[(4, 5, 9), (4, 6)]

方法 #2：使用 filter() + lambda + all()

在此，过滤任务是使用 filter() 和 lambda 函数执行的。

Python3

# Python3 code to demonstrate working of
# Positive Tuples in List
# Using filter() + lambda + all()
 
# initializing list
test_list = [(4, 5, 9), (-3, 2, 3), (-3, 5, 6), (4, 6)]
 
# printing original list
print("The original list is : " + str(test_list))
 
# all() to check each element
res = list(filter(lambda sub: all(ele >= 0 for ele in sub), test_list))
 
# printing result
print("Positive elements Tuples : " + str(res))

输出
原始列表是：[(4, 5, 9), (-3, 2, 3), (-3, 5, 6), (4, 6)]
正元素元组：[(4, 5, 9), (4, 6)]