Files (Open;Close;Access Modes) Video Lecture | Crash Course for EmSAT Achieve

Ans. In Python programming, there are several file access modes available. The commonly used file access modes are: - "r" mode: Read mode, which allows reading from a file. - "w" mode: Write mode, which allows writing to a file. If the file does not exist, it creates a new file. If it exists, it truncates the file. - "a" mode: Append mode, which allows appending data to an existing file. If the file does not exist, it creates a new file. - "x" mode: Exclusive creation mode, which creates a new file but raises an error if the file already exists. - "t" mode: Text mode, which is the default mode and treats the file as a text file. - "b" mode: Binary mode, which treats the file as a binary file.

Ans. The "with" statement in Python provides a convenient way to open and close a file automatically. Here's an example of opening a file using the "with" statement: ```python with open("filename.txt", "r") as file: # Perform operations on the file data = file.read() print(data) ``` In the above code, the file named "filename.txt" is opened in read mode. The file is automatically closed when the code block inside the "with" statement is executed.

Ans. To read the contents of a file in Python, you can use the `read()` method. Here's an example: ```python with open("filename.txt", "r") as file: data = file.read() print(data) ``` In the above code, the `read()` method reads the entire content of the file and returns it as a string. The content is then printed to the console.

Ans. To write to a file in Python, you can use the `write()` or `writelines()` method. Here's an example using the `write()` method: ```python with open("filename.txt", "w") as file: file.write("Hello, World!") ``` In the above code, the `write()` method writes the specified string to the file. If the file doesn't exist, it creates a new file. If it exists, it truncates the file and writes the new content.

Ans. In Python, you can close a file using the `close()` method. Here's an example: ```python file = open("filename.txt", "r") # Perform operations on the file file.close() ``` In the above code, the `close()` method is called to close the file. It is important to close the file after performing operations to free up system resources. Alternatively, you can use the `with` statement, as shown in the previous questions, which automatically closes the file after the code block execution.