Python–从混合矩阵中提取字符串元素
原文:https://www . geesforgeks . org/python-extract-string-elements-from-mixed-matrix/
给定一个矩阵，提取所有字符串数据类型的元素。
输入 : test_list = [[5，6，3]，[“Gfg”，3]，[9，“best”，4]] 输出:[‘Gfg’，‘best’] 解释:提取所有字符串。
输入:test _ list =[[“Gfg”，3]，[9，“best”，4]] 输出:[“Gfg”，“best”] 解释:提取所有字符串。
方法一:使用列表理解+ isinstance()
上述功能的组合可以用来解决这个问题。在本文中，我们使用列表理解迭代嵌套列表，并使用 isinstance() 检查字符串实例。
Python 3
# Python3 code to demonstrate working of
# Extract String elements from Mixed Matrix
# Using list comprehension + isinstance()
# initializing lists
test_list = [[5, 6, 3], ["Gfg", 3, "is"], [9, "best", 4]]
# printing original list
print("The original list : " + str(test_list))
# strings are extracted using isinstance()
res = [ele for sub in test_list for ele in sub if isinstance(ele, str)]
# printing result
print("The String instances : " + str(res))
Output
The original list : [[5, 6, 3], ['Gfg', 3, 'is'], [9, 'best', 4]]
The String instances : ['Gfg', 'is', 'best']
方法 2:使用 chain.from_iterables() +列表理解+ isinstance()
这是执行这项任务的另一种方式。将整个矩阵展平，然后将应用于其上，以检查展平列表中的字符串元素。
Python 3
# Python3 code to demonstrate working of
# Extract String elements from Mixed Matrix
# Using chain.from_iterables + list comprehension + isinstance()
from itertools import chain
# initializing lists
test_list = [[5, 6, 3], ["Gfg", 3, "is"], [9, "best", 4]]
# printing original list
print("The original list : " + str(test_list))
# strings are extracted using isinstance()
# using chain.from_iterables()
res = [ele for ele in chain.from_iterable(test_list) if isinstance(ele, str)]
# printing result
print("The String instances : " + str(res))
Output
The original list : [[5, 6, 3], ['Gfg', 3, 'is'], [9, 'best', 4]]
The String instances : ['Gfg', 'is', 'best']
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