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What is the purpose of opening a file?

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The purpose of opening the file is to establish connection between file and the program. In python, there is a built-in function to open a file and this function returns a file object. Before using a file in a program, for file operations (like read, write or append etc.) it should be opened.

Syntax to open a file:

The following syntax is used to open a file:

variable_name = open("filename", "mode")

"variable_name" is the name of the variable for file object.

"open()" is a function used to open a file.

"filename" is a name of the file and it should be specified as a "string".

"mode" is used to specify the mode for performing file operations

such as read,write and append.

Examples of different operations:

The following line is used to open and write the contents into the file:

number_file = open('number_list.txt','w')

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