在python中使用正则表达式检测子字符串

我有一本字典如下

myfood = {'yummy tim tam': 1, 'tasty chips': 3, 'yummy': 10, 'a loaf of bread': 5}

myset = {'yummy', 'a', 'tasty', 'of', 'delicious', 'yum'}

myfood = {'tim tam': 1, 'chips': 3, 'yummy': 10, 'loaf bread':5}

for word in myfood.keys():
      if word in myset:
           #Do nothing
      else:
          ######Find the substring part and remove it

我还有一套如下

myfood = {'yummy tim tam': 1, 'tasty chips': 3, 'yummy': 10, 'a loaf of bread': 5}

myset = {'yummy', 'a', 'tasty', 'of', 'delicious', 'yum'}

myfood = {'tim tam': 1, 'chips': 3, 'yummy': 10, 'loaf bread':5}

for word in myfood.keys():
      if word in myset:
           #Do nothing
      else:
          ######Find the substring part and remove it

现在，我想在

myfood

的子字符串中识别

myset

的元素并将其删除。因此，我最后的

myfood

字典应该如下所示

myfood = {'yummy tim tam': 1, 'tasty chips': 3, 'yummy': 10, 'a loaf of bread': 5}

myset = {'yummy', 'a', 'tasty', 'of', 'delicious', 'yum'}

myfood = {'tim tam': 1, 'chips': 3, 'yummy': 10, 'loaf bread':5}

for word in myfood.keys():
      if word in myset:
           #Do nothing
      else:
          ######Find the substring part and remove it

注意：如果元素是完整字符串，我不想删除

myset

元素。例如，

'yummy'：myfood

中的10不会被删除，因为它不是子字符串，而是完整字符串

我目前的代码如下

myfood = {'yummy tim tam': 1, 'tasty chips': 3, 'yummy': 10, 'a loaf of bread': 5}

myset = {'yummy', 'a', 'tasty', 'of', 'delicious', 'yum'}

myfood = {'tim tam': 1, 'chips': 3, 'yummy': 10, 'loaf bread':5}

for word in myfood.keys():
      if word in myset:
           #Do nothing
      else:
          ######Find the substring part and remove it

---

请帮助我。

使用

re.sub

仅替换作为子字符串的键：

pat = re.compile(r'|'.join([r'(\s|\b){}\b'.format(x) for x in myset]))

dct = {}
for k, v in myfood.items():
   if k not in myset: # exclude full strings
      k = pat.sub('', k).strip()
   dct[k] = v

print(dct)
# {'yummy': 10, 'loaf bread': 5, 'tim tam': 1, 'chips': 3}