Adding yield

Author: andrelbd1

README.md

@@ -54,6 +54,7 @@
 - [Format](python_utils/format/README.md)
 - [List Comprehension](https://htmlpreview.github.io/?https://github.com/andrelbd1/algorithms-practice/blob/master/python_utils/list_comprehension/list_comprehension.html)
 - [Walrus Operator](python_utils/walrus_operator/README.md)
+- [Yield](python_utils/yield/README.md)
 
 ### [Design Patterns](https://www.youtube.com/playlist?list=PLQhuS49baMUmiygUlBJexyHxpSghlId7g)
 - [Singleton](design_patterns/singleton/README.md)

python_utils/yield/README.md

@@ -0,0 +1,12 @@
+### Yield
+- Yield is a fairly simple statement. Its primary job is to control the flow of a generator function in a way that’s similar to return statements.
+- When you call a generator function or use a generator expression, you return a special iterator called a generator. You can assign this generator to a variable in order to use it. When you call special methods on the generator, such as next(), the code within the function is executed up to yield.
+- When the Python yield statement is hit, the program suspends function execution and returns the yielded value to the caller. When a function is suspended, the state of that function is saved. This includes any variable bindings local to the generator, the instruction pointer, the internal stack, and any exception handling.
+
+
+#### Examples
+- [Code 1](example_1.py)
+- [Code 2](example_2.py)
+
+
+### [Back](../../README.md)

python_utils/yield/example_1.py

@@ -0,0 +1,11 @@
+def random_numbers():
+    for i in range(10):
+        yield i
+
+gen = random_numbers()
+
+print(next(gen))
+print(next(gen))
+print(next(gen))
+print(next(gen))
+print(list(gen))

python_utils/yield/example_2.py

@@ -0,0 +1,19 @@
+def random_numbers():
+    for i in range(3):
+        yield i
+
+def random_numbers_100():
+    for i in range(100,105):
+        yield i
+
+def generator():
+    yield from random_numbers()
+    print('Next generator')
+    yield from random_numbers_100()
+
+if __name__ == '__main__':
+    gen = generator()
+    print(next(gen))
+    print(next(gen))
+    print(next(gen))
+    print(list(gen))