Generator Yield and Return Interplay in Python
Prior to Python 3.3, combining return and yield within a function definition would result in an error. However, in Python 3.3 and later, this behavior has been updated.
Python 3.3 Behavior
In Python 3.3, the return statement within a generator function is now treated similarly to a raise StopIteration() statement. As a result, using both return and yield in a generator is now equivalent to raising a StopIteration exception with the specified value.
Example:
Consider the following code:
<code class="python">def f(): return 3 yield 2</code>
When the f() function is called, it will no longer raise a runtime error. Instead, the __next__() function of the generator object (x) will raise a StopIteration exception with the value 3:
<code class="python">x = f() try: print(x.__next__()) except StopIteration as e: print(e.value) # Prints "3"</code>
Yielding the Returned Value
If a generator function is delegated using the yield from syntax, the returned value of the return statement will be the result of the delegated generator.
Example:
<code class="python">def f(): return 1 yield 2 def g(): x = yield from f() print(x) # Iterate through the generator: for _ in g(): pass # Prints "1"</code>
In this example, the f() generator is delegated to the g() generator using yield from. As a result, the value returned by return 1 in the f() generator becomes the result of the g() generator.
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