- Python Introduction
- Python - Overview
- Python - History and Evolution
- Python - Significance in Modern Development
- Python - Understanding Python's design philosophy and the Zen of Python
- Python - Installing Python and Setting up the Development Environment
- Python - Setting Up the Development Environment
- Python - Basic Syntax and Execution of Python Scripts
- Python - Getting Started to Python
- Python Basics
- Python - Control flow (If statements, Loops - For and While)
- Python - Operators (Arithmetic, Comparison, Logical, Assignment)
- Python - Arithmetic Operators
- Python - Comparison Operators
- Python - Logical Operators
- Python - Assignment Operators
- Python - Integers (int)
- Python - Floats (float)
- Python - Strings (str)
- Python - Loop Control Statements
- Python - Loops
- Python - If Statements
- Python - Python's built-in functions
- Python - Using Built-in Functions
- Python - Examples of Common Built-in Functions
- Python Data Structures
- Python - Understanding Lists, Tuples, Sets, and Dictionaries
- Python - Lists
- Python - Tuples
- Python - Sets
- Python - Dictionaries
- Python - Operations on Data Structures (Indexing, Slicing, Appending, Removing)
- Python - Advanced Usage
- Python - Advanced Data Manipulation Techniques (List Comprehension, Dictionary comprehension)
- Python - List Comprehensions
- Python - Dictionary Comprehensions
- Python Functions and Modules
- Python - Defining a Function
- Python - Function arguments and return values
- Python - Function Arguments
- Python - Return Values
- Python - Defining and calling functions
- Python - Using the Return Value
- Python - Calling the Function with Arguments
- Python - Creating a Module
- Python - Importing a Module
- Python - Creating a Package
- Python - Importing from a Package
- Python - Creating and importing modules and packages
- Python - Introduction to Python standard libraries.
- Python - File and Directory Access
- Python - Internet Data Handling
- Python - Networking
- Python - Data Persistence and Serialization
- Python - Data Compression and Archiving
- Python - Concurrent Execution
- Python - Mathematics
- Python - Date and Time
- Python - Development Tools
- Python Object-Oriented Programming
- Python - Understanding classes and objects
- Python - Understanding Classes
- Python - Understanding Objects
- Python - Inheritance, encapsulation, and polymorphism
- Python - The constructor, class variables, and instance variables
- Python - Magic methods and their importance
- Python Error Handling and Debugging
- Python - Exceptions
- Python - Working Code Sample Demonstrating Both
- Python - Handling exceptions with try-except blocks
- Python - Syntax Errors versus Exceptions
- Python - Using logging for Debugging and Error tracking
- Python Working with Files
- Python - Reading from and writing to files
- Python - Writing to a File
- Python - Reading from a File
- Python - Combined Example of Reading and Writing
- Python - Understanding file handling modes
- Python - Common File Handling Modes
- Python - Working with different file formats (text, CSV, JSON)
- Python - Working with Text Files
- Python - Working with JSON Files
- Python - Working with CSV Files
- Python Web Scraping
- Python - Introduction to Beautiful Soup and requests library
- Python - Beautiful Soup
- Python - Requests Library
- Python - Legality of Web Scraping
- Python - Overview of web scraping and its legality
- Python - Combined Example: Using Both Requests and Beautiful Soup
- Python - Conclusion
Python - Common File Handling Modes
Common File Handling Modes in Python
The different types of file control define how the file should be opened and what types of operations (read/write) can be performed. Here are the most common ways to handle files in Python:
- 'r': By default, read mode. allows you to read a file. If there is no file, an error will occur.
- 'w': stands for write mode. opens a file for writing, truncates it to zero length if it already exists, and creates the file if it doesn't.
- 'a': Mode of append. opens a file without trimming it at the end for appending. if the file doesn't already exist, create a new one.
- 'b': stands for binary mode. added to other modes (like "rb" and "wb") to manage binary files.
- '+': Mode of updating. permits writing to and reading from the same file. used together with other modes (such 'r+' and 'w+').
Example
In this example, we demonstrate and show how to read, write, and add to a file using various file modes:
# Write mode: Create a new file or overwrite the existing one
with open('sample.txt', 'w') as file:
file.write("Line 1: Written in write mode.\n")
# Read mode: Read the content of the file
with open('sample.txt', 'r') as file:
print("Reading content:", file.read())
# Append mode: Add new content without removing existing data
with open('sample.txt', 'a') as file:
file.write("Line 2: Appended in append mode.\n")
# Read+ mode: Read and write to the same file
with open('sample.txt', 'r+') as file:
content = file.read()
print("Before writing in r+ mode:", content)
file.write("Line 3: Added in read+ mode.\n")
# Final read to display all content
with open('sample.txt', 'r') as file:
print("Final content:", file.read())illustration of example
- First, the file sample.txt is opened in write mode ('w'), which adds a line to it and creates the file if it doesn't already exist.
- Next, the file is opened in read mode ('r') so that its contents can be seen.
- After that, a second line is added to the file without deleting the prior one while it is open in append mode ('a').
- After that, the file is opened in read+ mode ('r+'), enabling both writing and reading. After reading and displaying the contents of the file, a third line is appended.
- Ultimately, the file is reopened in read mode to show the whole contents, including the line that was added.
- By comprehending and utilizing file handling modes appropriately, you can guarantee that your file actions function as intended, avoiding data loss and guaranteeing data integrity.
