File Handling || Notes || Sumita Arora || Class 12 || Computer science || Information practices




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Note = All given notes are based on Sumita Arora book class 12


File Handling

 

Data Files: - The data files are the files that store data pertaining to specific application, for later use. The data files can be store in two ways:
• Text files
• Binary files

OPENING AND CLOSING FILES

Opening files: -
In data file handling through Python, the first thing that you do is open the file. It is done using open() function as per one of the following syntax:

<file object name>=open(<file name>)
<file object name>=open(<file name>,<mode>)

For example:

stu = open ("students.txt")
The above statement open file "students.txt" in file mode as read mode (default mode) and attaches it to file object namely stu.

Consider another statement:

stu = open ("students.txt","r")
The above statement opens the file "students.txt" in read mode (because of "r" given as mode) and attaches it to file object namely stu.

Consider one more file open statement: -

stu = open ("e:\\main\\students.txt","w")
The above statement open file "students.txt"(stored in folder e:\main) in write mode (because of "w" given as mode) and attaches it to file object namely stu.

Please note that when you open a file in read mode, the given file must exist in folder, otherwise Python will raise error.




File Object/ File Handle: - A file object is a reference to a file on disk. It opens and makes it available for a number of different tasks.

File Access Modes: -




• A file-mode governs the type of operations (e.g., read/write/append) possible in the opened file i.e., it refers to how the file will be used once it's opened.


 

Closing File: -

A close () function breaks the link of file object and the file on the disk. After close (), no tasks can be performed on that file through the file object (or file handle).

READING AND WRITING FILES: -

Reading from Files: -







Writing onto Files: -



PATHNAME: - The full name of a file or a file directory is called pathname.

For example: -
E:\work\project

 

 

 




 

 

Thankyou!!!!!

 

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