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Here are a few ways you can check if a list is empty: a = [] #the list 1) The pretty simple pythonic way: if not a: print("a is empty") In Python, empty containers such as lists,tuples,sets,dicts,variables etc are seen as False. One could simply treat the list as a predicate (returning a Boolean value).
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BetaIn article we will explore the different ways to check if a list is empty with simple examples. The simplest way to check if a list is empty is by using Python's not operator. Using not operator. The not operator is the simplest way to see if a list is empty. It returns True if the list is empty and False if it has any items. Python
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BetaLearn different methods to check if a list or a NumPy array is empty in Python, such as using not, len, bool, or size. See examples, use cases, and edge cases with explanations.
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BetaLearn three methods to check if a list is empty in Python using the not operator, the len() function, and comparison. See examples and explanations for each method.
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BetaLearn how to check if a list, tuple, or NumPy array is empty in Python using len() function, boolean evaluation, or size attribute. Find out common practices, error handling, and performance implications for empty arrays.
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BetaLet's explore how to use the not keyword to check if a list is empty. my_list = [] if not my_list: print ("The list is empty") else: print ("The list is not empty") Method 2: Using the len() Function. len() returns the number of elements in a list. When the list is empty, it will return 0. Here is an example of how to use len() to check if the ...
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BetaMethod 2: Using the len() function. Here we will use the len() function to check whether the list is empty or not. So, first create a variable to store the input empty list. Check whether the length of the list is equal to 0 using the len() function in an if conditional statement.
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BetaTo check if a NumPy array is empty, we can simply examine its size attribute. The size attribute returns the total number of elements in the array, so if the array is empty, its size will be 0. See also Find Indexes of Sorted Values in Numpy
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Beta[/python] And we check each one again, this will be the result: [python] >>>is_empty(d) Structure is not empty. False [/python] As you can see, all the default data structures are detected as empty by treating the structure like a boolean in the if statement. If the data structure is empty, it "returns" False when used in a
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BetaTo use the bool() function to check if a Python list is empty, you can pass the list as an argument to the bool() function. ... While you can still use many of the Python-native methods to check if a numpy array is empty, numpy offers a more efficient and idiomatic way to handle this. You can use the size attribute of the numpy array, which returns the number of elements in the array. If the size is 0, the array is empty.
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