How do you read and write files in Python?

Python >   Work with Files >   Open Read and Write  

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Answer:

Reading and writing files in Python is straightforward and can be done using the built-in open function. The open function opens a file, and returns a file object that can be used to read or write the contents of the file.

Here is an example of how to read the contents of a text file in Python:

# Open the file in read mode
with open("filename.txt", "r") as file:
    # Read the contents of the file
    contents = file.read()
    # Print the contents of the file
    print(contents)

And here is an example of how to write to a text file in Python:

# Open the file in write mode
with open("filename.txt", "w") as file:
    # Write some text to the file
    file.write("Hello, World!")

It is important to use the with statement when working with files, as this ensures that the file is properly closed and released after it is no longer needed, even if an exception is raised.

When opening a file in write mode, any existing contents of the file will be overwritten. To append to an existing file, you can open the file in append mode by using the "a" mode when calling the open function.

In addition to reading and writing text files, Python also provides ways to work with binary files, such as images and audio files. The basic concepts are the same, but the methods used to read and write the contents of the file may be different, depending on the type of file and the library used to work with it.

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