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Articles by SaiKrishna Tavva
Page 5 of 8
How to call a function of a module from a string with the function\\\'s name in Python?
In Python, you can dynamically call a function from a module by using its name as a string. This is useful in scenarios where function names are not known until runtime. Below are several methods to achieve this. Using getattr() Function Using globals() Function Using locals() Function Using importlib Module Using 'getattr()' Function The getattr() function is a built-in Python function that allows you to retrieve an attribute from an object using a string representing the attribute's name. This is particularly useful ...
Read MoreHow to delete multiple files in a directory in Python?
Python provides robust modules for file and directory manipulation, namely the OS and shutil modules. The 'OS' module provides functions for interacting with the operating system. It allows you to perform operations such as creating, removing, and manipulating files and directories, as well as retrieving information about them. On the other hand, the shutil module offers a higher-level interface for file operations, making tasks like copying, moving, and deleting entire directories straightforward. Below are several methods to delete files and folders. Deleting Multiple Files To delete multiple files, we have to loop over a list of filenames and apply the os.remove() function ...
Read MoreWhat is the difference between CHAR and NCHAR in MySQL?
In MySQL, both CHAR and NCHAR are ASCII character data types used for storing text data, but they differ significantly in terms of storage, data representation, and performance. CHAR and NCHAR columns can have different collations, determining how strings are compared and sorted. The CHAR type typically uses the collation associated with its specified character set. On the other hand, NCHAR is intended for Unicode data and typically uses a collation that can handle Unicode characters, ensuring proper sorting and comparison. Understanding 'CHAR' in MySQL The CHAR data type is primarily used to store ASCII character data. It is a ...
Read MoreHow we can import Python modules without installing?
In Python, there are several ways to import modules without requiring installation. This can be particularly useful when you do not have administrative privileges or need to manage different module versions. Below are some common approaches: Using 'sys.path' to Include Additional Directories Using 'virtualenv' for Isolated Environments Using 'importlib' for Dynamic Imports Using 'sys.path' to Include Additional Directories We can add directories to Python's search path at runtime using the sys.path list. This allows Python to look for modules in custom locations and include directories where ...
Read MoreUnix style pathname pattern expansion in Python (glob)
When working with files in Python, you often need to iterate through a list of files that match specific patterns. The 'glob' module provides a convenient way to accomplish this by using Unix-style pathname pattern expansion. It allows you to search for files based on their names, including wildcards, making managing files in your directory easier. Overview of the glob Module The glob module primarily offers three functions: glob(): Returns a list of files that match the specified pattern. iglob(): Returns an iterator (generator) for the matching files, which can be ...
Read MoreHow to open a binary file in append mode with Python?
In Python, to open a binary file in append mode, we can use the open() function with the mode set to ab. This allows us to open an existing file or create a new one. Using the open() function with the appropriate mode enables us to work with the file as needed. Mode 'ab' In the mode 'ab', the 'a' stands for append mode, which allows us to add new data to the end of the file without truncating its existing content. The 'b' stands for binary mode, used when handling files containing non-text data or non-readable characters. Binary files ...
Read MoreHow will you compare namespaces in Python and C++?
Namespaces help in organizing code, managing the scope of variables and preventing naming conflicts. Python and C++ use namespaces, but they do so in different ways. Below is an overview of namespaces in both. Namespaces in C++ In C++, namespaces are created using the keyword 'namespace'. They are mainly intended to organize code into logical groups and avoid name conflicts, particularly when working with multiple libraries. Example In the following example we are going to how to use a namespace by utilizing '::' to access functions within that namespace. #include using namespace std; // first namespace namespace first_space ...
Read MoreHow do we use re.finditer() method in Python regular expression?
The re.finditer() method in Python's 're' module finds all occurrences of a specified pattern in a string. It returns an iterator containing match objects for each occurrence. This method is especially useful when you need to determine the position of each match within the input string. Following is the syntax for re.finditer() method. re.finditer(pattern, string, flags=0) How to Use 're.finditer()' Method Following are the steps involved in using re.finditer() method. Import the re module: You need to import the regular expression module before using it. ...
Read MoreWhat are the modules available in Python for converting PDF to text?
Python offers several powerful libraries to convert PDF documents to plain text, such as PyPDF2 and PDFMiner which are two popular modules for text extraction from PDFs. Some of the common approaches (modules) for converting PDF to text are as follows- Using PyPDF2 Using PDFMiner Using PyMuPDF Using 'PyPDF2' Module PyPDF2 is a versatile library used for manipulating PDF files, focusing on functions such as merging, splitting, rotating pages, and extracting text. It offers a simple approach for performing basic PDF operations. To extract data using ...
Read MorePython Sequence Types
In Python programming, some basic sequence type classes are, Lists , Strings , Tuples, Range, etc, these data structures hold an ordered collection of items. They allow us to access their elements through indexing and iteration, there are additional sequence-type objects such as Byte sequences. Sequence Types In Python Sequence types in Python are categorized into two types they are mutable and immutable sequences. Mutable Sequence Types These Sequences can be changed after their creation, and also we can modify elements, adding new elements and removing existing ones. Lists: A list is a mutable, ordered ...
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