with statement
- Python course
- Intermediate
- Lesson 106/116
- 5 min
Learn how the with statement works.
The with statement
The with statement opens a resource, uses it and closes it automatically. No matter how the block ends — even on error — cleanup always runs:
with open("dosya.txt") as f:
icerik = f.read()
# f auto-closedHere open opens the file; when the with block ends the file closes automatically. No need to write finally. This prevents resource leaks.
It is standard for resources like files, database connections and locks.
Naming the resource with as
The with ... as pattern gives the resource a name. This name is used inside the block:
with open("dosya.txt") as f:
print(f.read())Here f holds the file object. When the block ends f closes automatically; no need to call f.close().
This is the most common pattern for file operations.
Practice Use a simple context manager
The Kaynak class is already defined. Inside a with Kaynak(): block write print("içeride").
Starter code
class Kaynak:
def __enter__(self):
print("açtı")
return self
def __exit__(self, *args):
print("kapattı")
# open a with block and print içerideSample solution
with Kaynak():
print("içeride")Expected output
açtı içeride kapattı
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 What does the with block guarantee?
- The code runs faster
- No error is raised
- The resource is always closed Correct answer
- Variables are deleted
Explanation: The with block closes the resource even on error.
2 Complete the with statement
____ Kaynak():
print("içeride")with Kaynak():
print("içeride")Explanation: with Kaynak() starts a context manager.
3 Match with concepts
| Term | Meaning |
|---|---|
with |
Starts the block |
as |
Names the resource |
__enter__ |
Opening |
__exit__ |
Closing |