Python File Handling | File Operations in Python | Learn python programming | Edureka

Jan 25, 201913 likes7,619 views

** Python Certification Training: https://www.edureka.co/python ** This Edureka PPT on File Handling with Python covers all the important aspects of using files in Python right from the introduction to what fields are, all the way till checking out the major aspects of working with files and using the code-first approach to understand them better. Python Tutorial Playlist: https://goo.gl/WsBpKe Blog Series: http://bit.ly/2sqmP4s Follow us to never miss an update in the future. Instagram: https://www.instagram.com/edureka_learning/ Facebook: https://www.facebook.com/edurekaIN/ Twitter: https://twitter.com/edurekain LinkedIn: https://www.linkedin.com/company/edureka

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Agenda
File Handling In Python

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Agenda
Introduction 01
Why need File Handling?
Getting Started 02
Concepts 03
Practical Approach 04
Types of Files
Looking at code to
understand theory
Python File Handling System

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Why need File Handling?
File Handling In Python

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Why Need File Handling?
Python Input
Arguments Standard Input
Files

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Types of Files
File Handling In Python

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Types Of Files
What you may know as a file is slightly different in Python
Text
BinaryImage Text
AudioExecutable

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What is File Handling?
File Handling In Python

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What Is File Handling?
File handling is an important part of any web application
Operations
Creating DeletionReading Updating
CRUD

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Python File Handling System
File Handling In Python

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Python File Handling System
The key function for working with files in Python is the open() function
open()
Filename Mode
Syntax open( filename, mode)
WORK
Create File
Open File
WORK
Close File

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Python File Handling System
Example Code
Example f = open(“demofile.txt”)
Example f = open(“demofile.txt”, “r”)
Note: Make sure file exists or else error!

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File Operations for Reading
File Handling In Python

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Reading Text File In Python
file.read()
Example
> file = open(“testfile.text”, “r”)
> print file.read()
Lots of ways to read a text file in Python
All characters Some characters

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Looping Over A File Object
Fast and efficient!
Example
> file = open(“testfile.text”, “r”)
> for line in file:
> print file.readline():
Looping over the object
Reading from files

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Python File Write Method
File Handling In Python

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File Write Method
Writing to an existing file
To write to an existing file, you must add a parameter to the open()
function:
"a" - Append - will append to the end of the file
"w" - Write - will overwrite any existing content
Example
> f = open("demofile.txt", "a")
> f.write(“ We love Edureka!")
Example
> f = open("demofile.txt", “w")
> f.write(“ We love Edureka!")
Note: the "w" method will
overwrite the entire file.

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File Write Method
Example
> file = open(“testfile.txt”, “w”)
> file.write(“This is a test”)
> file.write(“To add more lines.”)
> file.close()
I’m writing files!

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Creating a New File
File Handling In Python

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Creating A New File
open() method again
➢ file = open(“testfile.txt”, “x”)
➢ file = open(“testfile.txt”, “w”)
To create a new file in Python, use the open() method, with one of the following parameters:
"x" - Create - will create a file, returns an error if the file exist
"a" - Append - will create a file if the specified file does not exist
"w" - Write - will create a file if the specified file does not exist

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Deletion Operations
File Handling In Python

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Deleting A File
os.remove() function
To delete a file, you must import the OS module, and run its os.remove() function:
Example
> import os
> os.remove("demofile.txt")
Deleting a folder?
Example
> import os
> os.rmdir("myfolder")
Check if file exists
> import os
> if os.path.exists("demofile.txt"):
> os.remove("demofile.txt")
> else:
> print("The file does not exist")

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Conclusion
File Handling In Python

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Python File Handling | File Operations in Python | Learn python programming | Edureka

1. Python Certification Training https://www.edureka.co/python Agenda File Handling In Python

2. Python Certification Training https://www.edureka.co/python Agenda File Handling In Python

3. Python Certification Training https://www.edureka.co/python Agenda Introduction 01 Why need File Handling? Getting Started 02 Concepts 03 Practical Approach 04 Types of Files Looking at code to understand theory Python File Handling System

4. Python Certification Training https://www.edureka.co/python Why need File Handling? File Handling In Python

5. Python Certification Training https://www.edureka.co/python Why Need File Handling? Python Input Arguments Standard Input Files

6. Python Certification Training https://www.edureka.co/python Types of Files File Handling In Python

7. Python Certification Training https://www.edureka.co/python Types Of Files What you may know as a file is slightly different in Python Text BinaryImage Text AudioExecutable

8. Python Certification Training https://www.edureka.co/python What is File Handling? File Handling In Python

9. Python Certification Training https://www.edureka.co/python What Is File Handling? File handling is an important part of any web application Operations Creating DeletionReading Updating CRUD

10. Python Certification Training https://www.edureka.co/python Python File Handling System File Handling In Python

11. Python Certification Training https://www.edureka.co/python Python File Handling System The key function for working with files in Python is the open() function open() Filename Mode Syntax open( filename, mode) WORK Create File Open File WORK Close File

12. Python Certification Training https://www.edureka.co/python Python File Handling System The key function for working with files in Python is the open() function Syntax open( filename, mode) Any name that you want Different modes for opening a file "r" - Read - Default value. Opens a file for reading, error if the file does not exist "a" - Append - Opens a file for appending, creates the file if it does not exist "w" - Write - Opens a file for writing, creates the file if it does not exist "x" - Create - Creates the specified file, returns an error if the file exists "t" - Text - Default value. Text mode "b" - Binary - Binary mode (e.g. images) In addition you can specify if the file should be handled as binary or text mode

13. Python Certification Training https://www.edureka.co/python Python File Handling System Example Code Example f = open(“demofile.txt”) Example f = open(“demofile.txt”, “r”) Note: Make sure file exists or else error!

14. Python Certification Training https://www.edureka.co/python File Operations for Reading File Handling In Python

15. Python Certification Training https://www.edureka.co/python Reading Text File In Python file.read() Example > file = open(“testfile.text”, “r”) > print file.read() Lots of ways to read a text file in Python All characters Some characters

16. Python Certification Training https://www.edureka.co/python Reading Text File In Python file.read() Example > file = open(“testfile.text”, “r”) > print file.read() Example > file = open(“testfile.text”, “r”) > print file.read(5) This 5 indicates what?

17. Python Certification Training https://www.edureka.co/python Reading Text File In Python file.read() Example > file = open(“testfile.text”, “r”) > print file.readline(): Line by line output Example > file = open(“testfile.text”, “r”) > print file.readline(3): Read third line only Example > file = open(“testfile.text”, “r”) > print file.readlines(): Read lines separately

18. Python Certification Training https://www.edureka.co/python Looping Over A File Object Fast and efficient! Example > file = open(“testfile.text”, “r”) > for line in file: > print file.readline(): Looping over the object Reading from files

19. Python Certification Training https://www.edureka.co/python Python File Write Method File Handling In Python

20. Python Certification Training https://www.edureka.co/python File Write Method Writing to an existing file To write to an existing file, you must add a parameter to the open() function: "a" - Append - will append to the end of the file "w" - Write - will overwrite any existing content Example > f = open("demofile.txt", "a") > f.write(“ We love Edureka!") Example > f = open("demofile.txt", “w") > f.write(“ We love Edureka!") Note: the "w" method will overwrite the entire file.

21. Python Certification Training https://www.edureka.co/python File Write Method Example > file = open(“testfile.txt”, “w”) > file.write(“This is a test”) > file.write(“To add more lines.”) > file.close() I’m writing files!

22. Python Certification Training https://www.edureka.co/python Creating a New File File Handling In Python

23. Python Certification Training https://www.edureka.co/python Creating A New File open() method again ➢ file = open(“testfile.txt”, “x”) ➢ file = open(“testfile.txt”, “w”) To create a new file in Python, use the open() method, with one of the following parameters: "x" - Create - will create a file, returns an error if the file exist "a" - Append - will create a file if the specified file does not exist "w" - Write - will create a file if the specified file does not exist

24. Python Certification Training https://www.edureka.co/python Deletion Operations File Handling In Python

25. Python Certification Training https://www.edureka.co/python Deleting A File os.remove() function To delete a file, you must import the OS module, and run its os.remove() function: Example > import os > os.remove("demofile.txt") Deleting a folder? Example > import os > os.rmdir("myfolder") Check if file exists > import os > if os.path.exists("demofile.txt"): > os.remove("demofile.txt") > else: > print("The file does not exist")

26. Python Certification Training https://www.edureka.co/python Conclusion File Handling In Python

Python File Handling | File Operations in Python | Learn python programming | Edureka

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