Python interacts with files loaded in primary memory or main memory through “file handlers” ( This is how your operating system gives access to python to interact with the file you opened by searching the file in its memory if found it returns a file handler and then you can work with the file ). So when you need to change any text file or just to work with them in python you need to load that file into primary memory. Primary and Secondary memory every file that you saved or anyone saved is on secondary memory cause any data in primary memory is deleted when the computer is powered off. There are two kinds of memory in a computer i.e. The data being written will be inserted at the end, after the existing data. The handle is positioned at the end of the file. The file is created if it does not exist. Append and Read (‘a+’) : Open the file for reading and writing.Append Only (‘a’): Open the file for writing.The handle is positioned at the beginning of the file. For an existing file, data is truncated and over-written.
Write and Read (‘w+’) : Open the file for reading and writing.Creates the file if the file does not exist. For the existing files, the data is truncated and over-written. Write Only (‘w’) : Open the file for writing.Raises I/O error if the file does not exist. Read and Write (‘r+’): Open the file for reading and writing.This is also the default mode in which a file is opened. If the file does not exists, raises the I/O error. Read Only (‘r’) : Open text file for reading.File handle is like a cursor, which defines from where the data has to be read or written in the file. These modes also define the location of the File Handle in the file. It refers to how the file will be used once its opened. In this article, we will be focusing on opening, closing, reading, and writing data in a text file.Īccess modes govern the type of operations possible in the opened file. Binary files: In this type of file, there is no terminator for a line, and the data is stored after converting it into machine-understandable binary language.Text files: In this type of file, Each line of text is terminated with a special character called EOL (End of Line), which is the new line character (‘\n’) in python by default.There are two types of files that can be handled in python, normal text files and binary files (written in binary language, 0s, and 1s). Python provides inbuilt functions for creating, writing, and reading files. ISRO CS Syllabus for Scientist/Engineer Exam.
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