Reading File in Python

Opening a file in read mode:

• After working with any resource(file, database, server…) from the application must be released manually(closing statements)
• Improper shutdown of resources results loss of data.

Code:

class Process:
    file = None
    def main():
        try :
            Process.file = open("./script.py", "r")
            print("File opened in read mode")

        except FileNotFoundError:
            print("Exception : No such file to open")

        finally:
            if Process.file != None:
                Process.file.close()
                print("File closed")
        return
Process.main()

Reading information from the file:

• read() method is belongs to File object.
• Once the file has opened successfully, we need to call read() method on file object.
• read() method returns the complete content of file as an object.
• We can display the complete content of that data object in a single instance

class Process:
    file = None
    def main():
        try:
            Process.file = open("./script.py", "r")
            print("File opened")

            data = Process.file.read()
            print(data)

        except FileNotFoundError:
            print("Exception : No such file")

        finally:
            if Process.file != None:
                Process.file.close()
                print("File closed")
        return

Process.main()