Tag: Python qna
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Use of dictionary in python
In Python, a dictionary is a collection of key-value pairs, where each key is unique and corresponds to a value. Dictionaries are also known as associative arrays, hash tables, or maps in other programming languages. Here is an example of a dictionary in Python: In this example, the my_dict dictionary contains four key-value pairs, where…
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Using global variables in a Python function
In Python, a global variable is a variable that is defined outside of any function or class and is accessible to all functions and classes within the same module. Here is an example of the usage of a global variable: In this example, the my_global_var variable is defined outside the function and initialized with the…
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How to find the index of an item in a list?
In Python, you can find the index of an item in a list using the index() method. The index() method takes a single argument, which is the value you are searching for, and returns the index of the first occurrence of that value in the list. Here is an example: In this example, the index()…
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Understanding slicing in Python
Slicing in Python refers to the technique of selecting a range of elements from a sequence, such as a string, list, or tuple. Slicing is achieved by specifying a range of indices, separated by a colon, within square brackets following the sequence. Here’s the syntax for slicing: Let’s look at some examples: List of all…
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What is the difference between @staticmethod and @classmethod in Python?
In Python, the @staticmethod and @classmethod decorators are used to defining methods within a class. The difference between these two decorators lies in the way they handle the arguments passed to them. A @staticmethod is a method that belongs to the class and does not require an instance of the class to be called. This…
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How do I check whether a file exists without exceptions in Python?
In Python, you can check whether a file exists without raising any exceptions by using the os.path.exists() function from the built-in os module. This function takes a file path as its argument and returns True if the file exists, and False otherwise. Here’s an example of how to use os.path.exists() to check whether a file…
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Does Python have a ternary conditional operator?
Yes, Python has a ternary conditional operator. The ternary operator is a shorthand way of writing an if-else statement in a single line of code. The syntax for the ternary operator in Python is: Here, condition is the expression that is evaluated as either True or False. If condition is True, then the expression value_if_true…
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What does if __name__ == “__main__”: do in Python?
The line if __name__ == “__main__”: in Python is used to check whether the current module is being run as the main program or it is being imported as a module into some other program. This is a common technique used in Python to write code that can be used both as a standalone program…