File I/O

Save and load data as JSON.

File I/O: read with with

In this lesson you will read from a file-like object with the with statement. io.StringIO makes a string behave like a file:

from io import StringIO
with StringIO("kiraz") as f:
    print(f.read())

The starting code includes the previous solutions. You will add from io import StringIO and the with block. StringIO is useful for testing file operations.

This is the skeleton of real file-reading code.

Exercise Write a with block with StringIO

Write from io import StringIO. Inside a with StringIO("kiraz") as f: block write print(f.read()).

Show example solution

words = ["elma", "armut", "elma"]
print(len(words))
def say(words):
    return len(set(words))
print(say(words))
def uret(words):
    for w in words:
        yield w
for w in uret(words):
    print(w)
from io import StringIO
with StringIO("kiraz") as f:
    print(f.read())

Next step: putting it together

File I/O is ready — you can read from file-like objects with with. In the final lesson you will combine everything into a class: you will define and use a Sayac class. This final layer will make the code modular and reusable.

Classes keep data and methods together; this makes the code organised and testable. All the pieces of the project now come together.

Test yourself

Complete the StringIO import

from io import ____

with StringIO("kiraz") as f:
    print(f.read())

Show answer

from io import StringIO

with StringIO("kiraz") as f:
    print(f.read())

What happens to the StringIO object when the with block ends?
- Stays open
- Is deleted
- Raises an error
- Auto-closes
Show answer

Auto-closes — When the with block ends the object auto-closes.
Match file I/O

from io import StringIO

Import
with StringIO

Starts the block
f.read()

Reads
with end

Auto-closes

Next lesson: Putting it together

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