Question

在以下代码中，yield命令用于生成返回值。我想避免使用它，用迭代操作替换它。我该怎么办？

def triangulations(p):
    n = len(p)
    if n == 2:
         yield []
    elif n == 3:
        yield [p]
    else:
        for k in range(1, n - 1):
            for u, v in product(triangulations(p[:k + 1]), triangulations(p[k:])):
                yield u + [(p[0], p[k], p[-1])] + v

print(list(triangulations(tuple("abcde"))))

Answer 1

Constructor

更多解释：

def triangulations(p):
    result = []
    n = len(p)
    if n == 2:
         result.append([])
    elif n == 3:
         result.append([p])
    else:
        for k in range(1, n - 1):
            for u, v in product(triangulations(p[:k + 1]), triangulations(p[k:])):
                result.append( u + [(p[0], p[k], p[-1])] + v)
    return result

for i in triangulations([1, 2, 3]):
    print(i)

输出：

def triangulations(p):
    result = []
    n = len(p)
    print ("execute triangulations")
    if n == 2:
         result.append([])
    elif n == 3:
         result.append([p])
    else:
        for k in range(1, n - 1):
            for u, v in product(triangulations(p[:k + 1]), triangulations(p[k:])):
                result.append( u + [(p[0], p[k], p[-1])] + v)
    return result



triangulationsResult = triangulations([1, 2, 3])
for i in triangulationsResult:
    print(i)
for i in triangulationsResult:
    print(i)

def triangulationsYield(p):
    n = len(p)
    print ("execute triangulationsYield")
    if n == 2:
         yield []
    elif n == 3:
        yield [p]
    else:
        for k in range(1, n - 1):
            for u, v in product(triangulations(p[:k + 1]), triangulations(p[k:])):
                yield u + [(p[0], p[k], p[-1])] + v

triangulationsResultYield = triangulationsYield(["a", "b", "c"])
for i in triangulationsResultYield:
    print(i)
for i in triangulationsResultYield:
    print(i)

如何在python代码中避免yield命令

1 个答案: