File Handling:
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What is file?
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==> to store the data permanently we can use "files".
==> two types of files:
	1) Text Files ==> .txt ==> character data
	2) Binary Files ==> binary data
		audio files, video files, image files etc.

File Handling:
===============
	Open the file
	read the file
	write the file
	close file etc.

How to Open the file:
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open():
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Syntax:
	file-pointer = open(filename, mode)

File Modes:
	w-mode ==> write mode
	r-mode ==> read mode
	a-mode ==> append mode
	w+-mode ==> write + read mode
	r+-mode ==> read + write mode
	a+-mode	==> read + write

w-mode:
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	1) w-mode can able to open the existing file by flushing (override) the whole data.
	2) w-mode can able to create the new file if the specified file-name is not exist.

r-mode:
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	1) r-mode can able to open the existing file without overriding of the data.
	2) r-mode cannot able to create the new file if the specified filename is not existed.

a-mode:
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	1) a-mode can able to open the existing file without overriding of the data.
	2) a-mode can able to create the new file if the specified file name is not existed.
	==> a == reading + writing

w-mode Vs a-mode:
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	1) w-mode can write the data into file by overriding.
	2) a-mode can write the data after the reading the old content (at the end of the old content).

w+-mode:
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	1) w+-mode can open the existing file without overriding the data.
	2) w+-mode while writing into an existing file, it can override the old content.
	3) w+-mode can create the new file if the specified file is not existed.

r+-mode:
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	1) r+-mode also can able to open the existing file only.
	2) r+-mode can overwrite the data.

a+-mode:
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x-mode:
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	same like w-mode
	can't be open the existing file.