从列表中提取关键字的Python程序

给定 List of 字符串，提取所有作为关键字的单词。

Input : test_list = [“Gfg is True”, “Its a global win”, “try Gfg”], 
Output : [‘is’, ‘True’, ‘global’, ‘try’] 
Explanation : All strings in result list is valid Python keyword.

Input : test_list = [“try Gfg”], 
Output : [‘try’] 
Explanation : try is used in try/except block, hence a keyword. 

方法 #1：使用 iskeyword() + split() + 循环

这是可以执行此任务的方法之一。在这里，我们使用 iskeyword() 检查关键字并使用 split() 将字符串转换为单词。扩展到所有字符串的逻辑使用循环发生。

Python3

# Python3 code to demonstrate working of
# Extract Keywords from String List
  
# Using iskeyword() + loop + split()
import keyword
  
# initializing list
test_list = ["Gfg is True", "Gfg will yield a return",
             "Its a global win", "try Gfg"]
  
# printing original list
print("The original list is : " + str(test_list))
  
  
# iterating using loop
res = []
for sub in test_list:
   for word in sub.split():
  
       # check for keyword using iskeyword()
       if keyword.iskeyword(word):
           res.append(word)
  
# printing result
print("Extracted Keywords : " + str(res))

输出：

The original list is : [‘Gfg is True’, ‘Gfg will yield a return’, ‘Its a global win’, ‘try Gfg’]
Extracted Keywords : [‘is’, ‘True’, ‘yield’, ‘return’, ‘global’, ‘try’]

方法#2：使用列表理解

这是可以执行此任务的另一种方式。与上述方法类似，但在纸面上更紧凑，使用与上述方法类似的功能。

蟒蛇3

# Python3 code to demonstrate working of
# Extract Keywords from String List
  
# Using list comprehension
import keyword
  
# initializing list
test_list = ["Gfg is True", "Gfg will yield a return",
             "Its a global win", "try Gfg"]
  
# printing original list
print("The original list is : " + str(test_list))
  
# One-liner using list comprehension
res = [ele for sub in test_list for ele in sub.split() if keyword.iskeyword(ele)]
  
# printing result
print("Extracted Keywords : " + str(res))

输出：

The original list is : [‘Gfg is True’, ‘Gfg will yield a return’, ‘Its a global win’, ‘try Gfg’]
Extracted Keywords : [‘is’, ‘True’, ‘yield’, ‘return’, ‘global’, ‘try’]