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Hajipur, Bihar, 844101
Python
Introduction to Python
Python Basics
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Python Syntax
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Python Comments
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Python Variables
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Python Data Types
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Python Casting
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Python I/O
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Python Operators
Cotrol Structures
Data Structures
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Python Strings
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Python Lists
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Python Tuples
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Python Dictionaries
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Python Sets
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Python Arrays
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Python Bytes and Bytearray
Date and Time
Functions and Module
File Handling
Python OOP
Advanced Concepts
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Python Scope
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Python Modules
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Python JSON
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Python RegEx
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Python PIP
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Python Try...Except
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Python String Formatting
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Python User Input
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Python VirtualEnv
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Python Math
Python DSA
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Python DSA
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Lists and Arrays
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Python Stacks
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Python Queues
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Linked Lists
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Python Hash Tables
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Python Trees
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Python Binary Trees
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Binary Search Trees
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Python AVL Trees
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Python Graphs
Searching Algorithms
Sorting Algorithms
Python File Modes (r, w, a, x)
Python allows you to read, write, append, and create files using different modes with the open() function.
open("filename", "mode")
🔹 "r" – Read (Default Mode)
f = open("file.txt", "r")
print(f.read())
f.close()
✅ Opens file for reading only.
❌ Raises error if the file doesn’t exist.
🔹 "w" – Write (Overwrite)
f = open("file.txt", "w")
f.write("Hello, World!")
f.close()
✅ Creates the file if it doesn't exist.
⚠️ Overwrites the file if it exists.
🔹 "a" – Append
f = open("file.txt", "a")
f.write("\nNew line added.")
f.close()
✅ Adds new content to the end of the file.
✅ Keeps existing content untouched.
🔹 "x" – Create
f = open("newfile.txt", "x")
f.write("This file was created.")
f.close()
✅ Creates the file.
❌ Raises error if file already exists.
🔹 "t" – Text Mode (Default)
f = open("file.txt", "rt") # same as "r"
✅ Used for text files.
🔹 "b" – Binary Mode
f = open("file.jpg", "rb")
data = f.read()
f.close()
✅ Used for binary files like images, PDFs, etc.
🔹 Combine Modes
| Mode | Description |
|---|---|
"rb" |
Read binary |
"wb" |
Write binary |
"ab" |
Append binary |
"rt" |
Read text (default) |
"wt" |
Write text |
Practice Questions
Q1. Write a Python program to open a file in read ("r") mode and print its content.
Q2. Write a Python program to write "Good Morning" to a file using "w" mode (overwrites existing content).
Q3. Write a Python program to append a message to a file using "a" mode without deleting previous content.
Q4. Write a Python program to create a file using "x" mode and add some text (error if file already exists).
Q5. Write a Python program to handle error if a file does not exist in "r" mode using try-except.
Q6. Write a Python program to use "wb" mode to write binary data like b'010101' to a file.
Q7. Write a Python program to open a text file using "rt" mode and read its content.
Q8. Write a Python program to try opening a non-existing file in "x" mode and handle the error.
Q9. Write a Python program to check what happens if "w" mode is used on an existing file (observe overwritten content).
Q10. Write a Python program to read image data using "rb" mode and print the type of the data (should be bytes).
Python
Introduction to Python
Python Basics
-
Python Syntax
-
Python Comments
-
Python Variables
-
Python Data Types
-
Python Casting
-
Python I/O
-
Python Operators
Cotrol Structures
Data Structures
-
Python Strings
-
Python Lists
-
Python Tuples
-
Python Dictionaries
-
Python Sets
-
Python Arrays
-
Python Bytes and Bytearray
Date and Time
Functions and Module
File Handling
Python OOP
Advanced Concepts
-
Python Scope
-
Python Modules
-
Python JSON
-
Python RegEx
-
Python PIP
-
Python Try...Except
-
Python String Formatting
-
Python User Input
-
Python VirtualEnv
-
Python Math
Python DSA
-
Python DSA
-
Lists and Arrays
-
Python Stacks
-
Python Queues
-
Linked Lists
-
Python Hash Tables
-
Python Trees
-
Python Binary Trees
-
Binary Search Trees
-
Python AVL Trees
-
Python Graphs
Searching Algorithms
Sorting Algorithms
