In this tutorial, you will learn about Python File Handling. Before going to code and definition let’s understand the need or what it is. Think about you have a Notepad where you can write, read, edit, and delete content (text or words or sentences), even Notepad can open text files. So now think you have an application that has to read data from a file (excel sheet, doc file, text file, cv, etc) or add. That time you needed an open a file with a program.
Here we will learn and see examples of how to Create, Open, Read, Write, and Delete files in Python, which is called Python File Handling.
The Python program that does the file handling. These are built-in functions, so you don’t need third-party libraries.
|Create a File||Creates a new file with the given filename in write mode.|
|Open a File||Opens an existing file with the given filename in the specified mode.|
|Write to a File||Writes the specified text to the file.|
|Close a File||Closes the file, releasing system resources.|
|Delete a File||Deletes the specified file.|
Note: Replace “filename” with the actual name of the file you want to create, open, or delete. Replace “mode” with the desired file mode, such as
"r" (read mode),
"w" (write mode), or
"a" (append mode).
Python File Handling
The Main function for working with files (folders) in Python is the
open() the function takes two parameters first filename and another mode. The filename will be a file path with name and mode per the required operation on the file.
Modes in File Handling
wwrite mode – if the file doesn’t exist create it and open it in write mode. The stream is positioned at the beginning of the file.
rread mode – (Only read the file ) is a default in the open function. The stream is positioned at the beginning of the file.
aappend mode (if the file doesn’t exist create it and open it in append mode). The stream is positioned at the end of the file.
w+create a file – if it doesn’t exist and open it in write mode.
r+open an existing file in read+write mode.
a+– if it doesn’t exist and opens it in append mode.
We are using w mode to create the file. If the file doesn’t exist create it and open it.
f = open("cFile.txt", "w")
A complete tutorial about how to create a file read this tutorial: Python Create File (Empty Text File)
Assume we have the empty “testFile.txt” file, located in the same folder as Python. (if the file does not exist, then it will create)
Now writing the file.
‘w’ – Write mode
f = open("testFile.txt", "w") f.write("Hello file")
For a Detailed tutorial about Writing a File in Python read this post: Python Write to Text File
Read File & Open a File
Assume we have the “testFile.txt” file, located in the same folder as Python. Reading the file use
‘r’ – Read mode
Reading the file and print() all data in the console.
f = open("testFile.txt", "r") print(f.read())
A complete tutorial of the Reading file in photon must read this tutorial: Python Read File | Python File Open
The Python delete methods for files and folders.
os.remove()– Remove (delete) the file path.
os.rmdir()will remove an empty directory.
shutil.rmtree()will delete a directory and all its contents.
First, check whether the file or folder exists or not then only delete that file.
We assume have filed in project “cFile.txt.”.
import os if os.path.exists("cFile.txt"): os.remove("cFile.txt") else: print('File does not exists')
For all Delete methods and examples with explanations follow this tutorial: Python Delete File | Remove File
Note: This example (Project) is developed in PyCharm 2018.2 (Community Edition)
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
All Python File Handling Examples are in Python 3, so it may change its different from python 2 or upgraded versions.