Answer: The empty string in Python can be checked by the len() function, strip() function, and comparison operator ==.
Empty strings are usually found in the input given by the user, the data taken from an external source, and during the string manipulation process. An empty string is usually considered a ‘false’ meaning in a boolean context. Empty checks are most common in programming languages even in Python.
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Methods to Check if the String is Empty in Python
Python provides various methods to check if a string is empty or not. Following are some of these methods explained with the help of examples:
Method 1: Using len() Function to Check if a String is Empty in Python
The len() method verifies the characters in strings; if the length is zero, the string is said to be empty.
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Method 2: Using Comparison Operator ‘==’ to Check if a String is Empty in Python
When compared to other methods, it is the most straightforward. All we are doing is applying the equality check, which yields true if they are equal and false otherwise.
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Method 3: Using the ‘not’ Operator to Check if a String is Empty in Python
In this method, if the string is evaluated as false, the string is considered to be empty. It is an alternative to the direct comparison method.
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Method 4: Using __eq__ attribute to Check if a String is Empty in Python
It compares the two items’ equality and it is a special method. Internally, it functions similarly to the comparator operator “==” returns an empty string if the string is empty.
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Method 5: Using isspace() Function to Check if a String is Empty in Python
The isspace() function returns “True” if the string contains only whitespace characters (e.g., spaces, tabs, newlines).
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Method 6: Using bool() Function to Check if a String is Empty in Python
The boolean value is returned by the built-in value, bool(). If the string is not empty, it returns true; if it is, it returns false.
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Method 7: Using strip() Function to Check if a String is Empty in Python
You could be left with blank spaces when working with strings, which should also be regarded as an empty string. The Python function strip() will handle this.
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Conclusion
Finding the empty string in your code base using the above-mentioned methods can be useful when working with strings. Every method provides a unique way of finding empty string and you can choose methods according to the use case.