Explain file handling, file modes, file built in functions and built in methods

File Handling: File handling is an important part of any web application. Python has several functions for creating, reading, updating, and deleting files.

File Modes: File modes determine the type of operations allowed on the file. The most commonly used file modes are:

• 'r': Read mode which is used when the file is only being read.
• 'w': Write mode which is used to edit and write new information to the file.
• 'a': Appending mode, which is used to add new data to the end of the file.
• 'r+': Special read and write mode, which is used to handle both actions when working with a file.

File Built-in Functions: Python provides several built-in functions to work with files. Some of them are:

• open(): This function is used to open a file in the respective mode.
• close(): This function is used to close an already opened file.
• write(): This function is used to write data into the file.
• read(): This function is used to read data from the file.

Built-in Methods: Python provides several built-in methods to work with files. Some of them are:

• read(): This method reads the entire file.
• readline(): This method reads a file line by line.
• write(): This method writes a string to an open file.
• writelines(): This method writes a list of strings to the file.
• close(): This method closes the opened file. A closed file cannot be read or written any more.
• flush(): This method flushes the write buffer of the file stream.
• seek(offset[, from]): This method changes the current file position. The offset argument indicates the number of bytes to be moved. The from argument specifies the reference position from where the bytes are to be moved.
• tell(): This method returns the current file position.