Read and write files.
✍️ 3 exercises + code challenge in this lessonUse open(filename, mode) to work with files. Modes:
"r": read (default); error if the file does not exist."w": write; creates the file or overwrites it."a": append to the end."x": create; error if it already exists.Always use a with block: it closes the file automatically, even if an error occurs.
Mastering Python File Handling helps you write clean and reliable Python code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
with open("notes.txt", "w") as f:
f.write("Line 1: Learn Python\n")
f.write("Line 2: Build projects\n")
with open("notes.txt", "a") as f:
f.write("Line 3: Get hired\n")
with open("notes.txt") as f:
for line in f:
print(line.strip())
import os
print("Exists?", os.path.exists("notes.txt"))
os.remove("notes.txt")
print("Exists after delete?", os.path.exists("notes.txt"))Check what you learned in “Python File Handling”.
Open a file for appending.
with open("log.txt", "") as f:
Why use a with block when opening files?
Write "Hello file" to notes.txt, then read it back and print the content.
Free sign-in required · Google login available
Stuck on something?
Ask the community in the CodesInTech forum.
Need a developer?
Learning on your own is great — and when you need professional help, our team builds custom software, websites and mobile apps for clients worldwide.
Explore Our Services