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control/adder/coroadder.py

@@ -0,0 +1,87 @@
+"""
+
+    >>> adder = adder_coro()
+    >>> next(adder)
+    0
+    >>> adder.send(10)
+    10
+    >>> adder.send(20)
+    30
+    >>> adder.send(30)
+    60
+    >>> try:
+    ...     next(adder)
+    ... except StopIteration as exc:
+    ...     result = exc.value
+    ...
+    >>> result
+    Result(sum=60, terms=3, average=20.0)
+
+
+Closing a coroutine:
+
+    >>> adder = adder_coro()
+    >>> next(adder)
+    0
+    >>> adder.send(1)
+    1
+    >>> adder.send(10)
+    11
+    >>> adder.close()
+    >>> try:
+    ...     next(adder)
+    ... except StopIteration as exc:
+    ...     exc.value is None
+    ...
+    True
+
+"""
+
+import sys
+import collections
+
+Result = collections.namedtuple('Result', 'sum terms average')
+
+
+def adder_coro(initial=0):
+    total = initial
+    num_terms = 0
+    while True:
+        try:
+            term = yield total
+        except GeneratorExit:
+            break
+        if term is None:
+            break
+        total += term
+        num_terms += 1
+    return Result(total, num_terms, total/num_terms)
+
+
+def prompt():
+    while True:
+        try:
+            term = float(input('+ '))
+        except ValueError:
+            break
+        yield term
+
+
+def main(get_terms):
+    adder = adder_coro()
+    next(adder)
+    for term in get_terms:
+        adder.send(term)
+    try:
+        next(adder)
+    except StopIteration as exc:
+        result = exc.value
+    print(result)
+
+
+if __name__ == '__main__':
+    if len(sys.argv) > 1:
+        get_terms = (float(n) for n in sys.argv[1:])
+    else:
+        get_terms = prompt()
+    main(get_terms)

control/adder/coroadder_deco.py

@@ -0,0 +1,96 @@
+"""
+
+    >>> adder = adder_coro()
+    >>> next(adder)
+    0
+    >>> adder.send(10)
+    10
+    >>> adder.send(20)
+    30
+    >>> adder.send(30)
+    60
+    >>> try:
+    ...     next(adder)
+    ... except StopIteration as exc:
+    ...     result = exc.value
+    ...
+    >>> result
+    Result(sum=60, terms=3, average=20.0)
+
+
+Closing a coroutine:
+
+    >>> adder = adder_coro()
+    >>> next(adder)
+    0
+    >>> adder.send(1)
+    1
+    >>> adder.send(10)
+    11
+    >>> adder.close()
+    >>> try:
+    ...     next(adder)
+    ... except StopIteration as exc:
+    ...     exc.value is None
+    ...
+    True
+
+"""
+
+import sys
+import collections
+
+
+def coroutine(func):
+    def primed_coroutine(*args, **kwargs):
+        coro = func(*args, **kwargs)
+        next(coro)
+        return coro
+    return primed_coroutine
+
+
+Result = collections.namedtuple('Result', 'sum terms average')
+
+
+@coroutine
+def adder_coro(initial=0):
+    total = initial
+    num_terms = 0
+    while True:
+        try:
+            term = yield total
+        except GeneratorExit:
+            break
+        if term is None:
+            break
+        total += term
+        num_terms += 1
+    return Result(total, num_terms, total/num_terms)
+
+
+def prompt():
+    while True:
+        try:
+            term = float(input('+ '))
+        except ValueError:
+            break
+        yield term
+
+
+def main(get_terms):
+    adder = adder_coro()
+    for term in get_terms:
+        adder.send(term)
+    try:
+        adder.send(None)
+    except StopIteration as exc:
+        result = exc.value
+    print(result)
+
+
+if __name__ == '__main__':
+    if len(sys.argv) > 1:
+        get_terms = (float(n) for n in sys.argv[1:])
+    else:
+        get_terms = prompt()
+    main(get_terms)

control/adder/soma.py

@@ -0,0 +1,39 @@
+
+if 'raw_input' in dir(__builtins__):
+    input = raw_input  # para funcionar com Python 2
+
+def ler_num():
+    num = input('+: ')
+    try:
+        num = float(num)
+    except ValueError:
+        return 0
+    return num
+
+def somadora():
+    qt_parcelas = 0
+    total = 0
+    try:
+        while True:
+            parcela = yield
+            qt_parcelas += 1
+            total += parcela
+            print('parcelas: %d  total: %d' % (qt_parcelas, total))
+
+    finally:
+        print('parcelas: %d  total: %d  media: %d' % (qt_parcelas, total, total/qt_parcelas))
+
+def main():
+    coro = somadora()
+    next(coro)
+    while True:
+        item = ler_num()
+        if item:
+            coro.send(item)
+        else:
+            print('Fechando corotina...')
+            coro.close()
+            break
+
+if __name__=='__main__':
+    main()

control/adder/soma_deco.py

@@ -0,0 +1,47 @@
+
+if 'raw_input' in dir(__builtins__):
+    input = raw_input  # para funcionar com Python 2
+
+def ler_parcela():
+    parcela = input('+: ')
+    try:
+        parcela = float(parcela)
+    except ValueError:
+        return 0
+    return parcela
+
+# decorator
+def coro(func):
+    def start(*args, **kwargs):
+        g = func(*args, **kwargs)
+        next(g)
+        return g
+    return start
+
+@coro
+def somadora():
+    qt_parcelas = 0
+    total = 0
+    try:
+        while True:
+            parcela = yield
+            qt_parcelas += 1
+            total += parcela
+
+            print('parcelas: %d  total: %d' % (qt_parcelas, total))
+    finally:
+        print('parcelas: %d  total: %d  media: %d' % (qt_parcelas, total, total/qt_parcelas))
+
+def main():
+    coro = somadora()
+    while True:
+        parcela = ler_parcela()
+        if parcela:
+            coro.send(parcela)
+        else:
+            print('Fechando corotina...')
+            coro.close()
+            break
+
+if __name__=='__main__':
+    main()