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To check if a Python string contains only digits, you can use the built-in isdigit() method. This method returns True if all characters in the string are digits, and False otherwise. Besides isdigit(), you can also use loops or regular expressions to verify this condition. Using the isdigit() Method The isdigit() method is used to check if a string contains only digits. It returns True only when every character is a digit. Example In this example, we define a string that contains only digits and use the isdigit() method to check it. The output confirms that the string contains only ... Read More
In Python, you can easily check whether a string or a substring ends with a specific suffix using the built-in endswith() method. This method returns True if the string ends with the specified suffix, otherwise it returns False. This method also allows to check multiple suffixes at once and can operate on substrings by specifying start and end positions. Using the endswith() Method The endswith() method in Python checks if a string ends with a specified suffix and returns True or False. It can also check for multiple suffixes when provided as a tuple. Following is the syntax of the ... Read More
In Python, arguments are passed to functions using call by object reference or call by sharing. This means that when you pass a variable to a function, you are actually passing a reference to the object in memory, not a separate copy. For mutable objects like lists and dictionaries, this reference allows the function to modify the original object directly. So, any changes made inside the function will be reflected outside the function as well, similar to pass-by-reference in other languages. However, for immutable objects like integers, strings, and tuples, the object itself cannot be changed. If you ... Read More
When we are working with string data in Python, it's sometimed necessary to check if certain patterns appear in a string. Python's re module contains many methods which are used for pattern matching in the given strings using regular expressions. What is match() function? The match() function in re module is used in the scenarios such as validating structured input, checking prefixes or extracting information from well-defined formats such as phone numbers or dates. Syntax Following is the syntax of using the match() function in Python - re.match(pattern, string, flags=0) Where, pattern: The regular ... Read More
In Python, pip is a standard tool which is used to install third-party packages in our system. By default, pip installs packages into the site-packages directory of the current Python environment but in some cases, such as restricted environments or creating portable apps, we may need to install packages into a different directory. Then we can use the pip's --target option. Syntax Following is the syntax of using the pip command while installing a python package in a different directory - pip install --target The above command tells pip to install the specified package and all its ... Read More
When we are working with directories in Python, a clutter of hidden files can be created. Hidden files are created with a dot (.) on Unix-like operating systems and we can filter them easily. In this article, we will explore different methods to ignore hidden files using the os module and pathlib. Using List Comprehension with os.listdir() In Python, when we use the os.listdir() method the hidden files i.e., the files those are starting with a dot . are also included in the result. To ignore those hidden files and list only visible files we need to pass a condition ... Read More
When we are working with Python files or directories, we may often need to delete them to perform tasks such as cleaning up temporary files. Deleting directories isn't an easy task when compared with deleting files. In this article, we will explore all the different methods to delete a Python directory. Using shutil.rmtree() for Recursive Deletion The shutil module in Python has the rmtree()function, which is used to recursively delete a directory and all its contents. This function takes the directory path as the input parameter. Example Following is the example which uses the function shutil.rmtree() to delete a directory ... Read More
In Python, a Dictionary is one of the data structures that contains key-value pairs enclosed in curly braces '{}'. It is a Mutable and unordered data structure. Before proceeding with adding new keys to a dictionary, first let's create a dictionary with key and values. Following is the example of creating a dictionary with specified key and values - dict1 = {'key1': 'Tutorials', 'key2': 'Point', 'key3': 'Python'} print("Created Dictionary:", dict1) Following is the output of the above example - Created Dictionary: {'key1': 'Tutorials', 'key2': 'Point', 'key3': 'Python'} Adding new keys to a Dictionary Once a Dictionary is ... Read More
XML is abbrivated as Extensible Markup Language which is used format to represent a structured data. It's is useful when we are exchanging information between two systems. In Python, the xml.etree.ElementTree module helps us to read and work with XML data. In this article, we will explore how to extract specific parts of an XML file using this library. Introduction to XML and ElementTree When we are working with XML files in Python, the xml.etree.ElementTree module is used for parsing and navigating XML structures. It reads an XML document and builds a tree of elements from it by allowing us ... Read More
When working with files in Python, it's often useful to sort them based on their creation time. For example, to find the most recently added file or to process files in the order they were created then we need sort them by the creation date. Python provides built-in methods such as os and os.path which makes it easy to retrieve file metadata and sort directory contents accordingly. In this article, we will explore all the different method to sort the directories based on the creation date in Python - Using os.listdir() with sorted() and os.path.getctime() ... Read More