使用这3种简单的技巧在Python中检查列表是否为空

使用这3种简单的技巧在Python中检查列表是否为空

作者姚伟斌

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1. Using the len() function: The len() function returns the number of items in a list. If the length of the list is 0, it means the list is empty.

2. Using the not operator: The not operator can be used to check if a list is empty or not. If the list is empty, it will return True; otherwise, it will return False.

3. Using the bool() function: The bool() function can be used to check whether a list is empty or not. If the list is empty, it will return False; otherwise, it will return True.

4. Using a conditional statement: You can use an if statement with the condition of checking if the list is empty or not. If the list is empty, the code inside the if statement will be executed; otherwise, it will be skipped.

5. Using slicing: You can use slicing to check if a list is empty or not. If the list is empty, slicing it will return an empty list; otherwise, it will return a non-empty list.

6. Using the any() function: The any() function can be used to check if any element in the list is True. If the list is empty, it will return False; otherwise, it will return True.

7. Using the list comprehension: You can use list comprehension to check if a list is empty or not. If the list is empty, the comprehension will return an empty list; otherwise, it will return a non-empty list.