python - Python3 中的条件合并

Question

我正在尝试将变量合并到字典中现有的键。规则如下:

1. If key already exists, then increment the value counter by one.
2. If partial match to key exists: a. If variable length is smaller than key but re.search is not None, increment the value counter by one b. If variable length is larger than key and re.search is not None, replace key by variable and increment counter by one
3. If variable exists after this but still has no match in dictionary, add variable to dictionary

我已经能够完成 1、2a 和 2b，但我不确定如何添加 3。任何帮助/建议将不胜感激。这是目前形式的脚本:我还想在词典中看到“turtle”。

Animals = ["phant", "eleph", "tiger", "turtle", "zebra", "ostrich"]
Dict = {"horse":1, "elephant":1, "iger":1, "ostrich":1}

for name in Animals:
     if name in Dict:
             Dict[name]=Dict[name]+1
     else:
             for key, val in Dict.items():
                     if len(name) < len(key):
                             m = re.search (name, key)
                             if m != None:
                                     print ("Found match!", name)
                                     Dict[key] = Dict[key] + 1
                                     break
                     elif len(name) > len(key):
                              m = re.search (key, name)
                              if m != None:
                                     print ("Found match!", name)
                                     Dict[name] = Dict.pop(key) + 1
                                     Dict[name] = Dict[name] + 1
                                     break

Answer 1

查看代码后描述情况 #3 的一种方法是“如果 break 语句均未执行”。您可以通过在 for 循环后面放置 else 语句来处理这种情况。仅当 for 循环运行完成时才会执行此 block 中的代码(或者换句话说，循环内没有运行 break 语句):

Animals = ["phant", "eleph", "tiger", "turtle", "zebra", "ostrich"]
Dict = {"horse":1, "elephant":1, "iger":1, "ostrich":1}

for name in Animals:
    if name in Dict:
        Dict[name]=Dict[name]+1
    else:
        for key, val in Dict.items():
            if len(name) < len(key):
                m = re.search (name, key)
                if m != None:
                    print ("Found match!", name)
                    Dict[key] = Dict[key] + 1
                    break
            elif len(name) > len(key):
                m = re.search (key, name)
                if m != None:
                    print ("Found match!", name)
                    Dict[name] = Dict.pop(key) + 1
                    Dict[name] = Dict[name] + 1
                    break
        else:                 # this line and the one below it are new
            Dict[name] = 1