Web Reference: Definition and Usage The read() method returns the specified number of bytes from the file. Default is -1 which means the whole file. Sep 5, 2025 Β· Reading from a file in Python means accessing and retrieving contents of a file, whether it be text, binary data or formats like CSV and JSON. It is widely used in real-world applications such as reading configuration files, processing logs or handling datasets in data science. 1 day ago Β· To read a fileβs contents, call f.read(size), which reads some quantity of data and returns it as a string (in text mode) or bytes object (in binary mode). size is an optional numeric argument.
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