Generator layer

Set up data flow with generators and itertools.

Generator layer: produce with yield

In this lesson you will write the uret generator function. This function produces words one by one with yield:

def uret(words):
    for w in words:
        yield w

for w in uret(words):
    print(w)

The starting code includes the previous solutions. You will add the uret function and the for loop. A generator produces values one by one without loading the whole list into memory.

This saves memory with large data.

Exercise Write and consume the uret generator

Define def uret(words): with for w in words: yield w in the body. Then write for w in uret(words): print(w).

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)

Next step: file I/O

The generator layer is ready — you can produce words one by one. In the next lesson you will add a file I/O layer: reading from a file-like object with with. This layer will show the safe way to read data from files.

The with statement opens the resource and auto-closes it at block end; this prevents resource leaks. It is the foundation of real file operations.

Test yourself

What does yield do?
- Breaks the loop
- Raises an error
- Returns a value and pauses
- Deletes a variable
Show answer

Returns a value and pauses — yield produces a value and pauses; it resumes on the next call.
Match the generator

def uret

Generator function
yield

Produces a value
for w in uret

Consumption
words

Source data

Complete the yield keyword

def uret(words):
    for w in words:
        ____

Show answer

def uret(words):
    for w in words:
        yield w

Next lesson: File I/O

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