格式化条件语句的最佳方式

Question

我有以下条件语句：

  if(action == 'actionA'):
     if(collection == 'collectionA'):
       doActionA(collectionA)
     elif(collection == 'collectionB'):
       doActionA(collectionB)
  if(action == 'actionB'):
     if(collection == 'collectionA'):
       doActionB(collectionA)
     elif(collection == 'collectionB'):
       doActionB(collectionB)

这段代码看起来设计得很糟糕，有没有更好的 pythonic 方法来实现它？

Answer 1

如果是这样，即没有其他可能的操作和收集，请结合您的陈述：

if(
    action == 'actionA' and
    collection == 'collectionA'
):
    doActionA(collectionA)
elif(
    collection == 'collectionB'
):
    doActionA(collectionB)
if(
    action == 'actionB' and
    collection == 'collectionA'
):
    doActionB(collectionA)
elif(
    collection == 'collectionB'
):
    doActionB(collectionB)

Answer 2

根据名称“选择”元素的经典方法是使用字典。字典可以包含任何类型的对象，包括函数。

collections = {'collectionA': collectionA; 'collectionB': collectionB}
doActions = {'actionA': doActionA; 'actionB': doActionB}

# do action, without error checking
doActions[action](collections[collection])

# do action, with default value
doActions.get(action, doDefaultAction)(collections.get(collection, defaultCollection))

# do action, only if values are correct
if action in doActions and collection in collections:
    doActions[action](collections[collection])

格式化条件语句的最佳方式

Best way to format conditionnal statement

python

algorithm

design-patterns

conditional-statements

python-3.x