[Python] Retrieve the main key by using part of the sub value in a dictionary

I have a dictionary which has subkeys and sub values. I want to print a list of the main keys that contain a certain value in the subkey. I hope the example makes it clear:

cssStyleDict= {'.c13':{'color':'#000',
'font-family':'"Arial"',
'font-weight':'700',
'vertical-align':'baseline'},
'.c6':{'font-weight':'700'},
'.c7':{'color':'#000',
'font-size':'11pt',
'font-weight':'700',
'text-decoration':'none'},
'.c2':{'background-color':'#ff0'}}


I want to print a list of all keys that contain {'font-weight':'700'}. I have tried this:

def getKeysByValue(dictOfElements, valueToFind):
listOfKeys = list()
listOfItems = dictOfElements.items()
for item in listOfItems:
if item[1] == valueToFind:
listOfKeys.append(item[0])
return listOfKeys

listOfKeys = getKeysByValue(cssStyleDict, {'font-weight':'700'} )
for key in listOfKeys:
print(key)


But of course this only gives me an exact match. I've also tried using a regex expression, but to no avail. The output should be a list containing .c13 .c6 .c7

Thanks in advance if anyone can help.

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