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我正在创建一个将几个列表合并为一个字符串的函数，并且遇到以下错误。

Traceback (most recent call last):
  File "TraditionalRoute\BioKeywords.py", line 65, in <module>
    print(PrintKeyDefs())
  File "TraditionalRoute\BioKeywords.py", line 30, in PrintKeyDefs
    defsTwo = dict(map(None, letters, defsOne))
TypeError: 'NoneType' object is not callable

我的代码如下：

# print keyword and three definitions, one of which is the correct definition
def PrintKeyDefs():
   print('\nRandomly selected keyword:',SelectKeyword(),'\n')
   # definitions below
   defsOne = []
   defsOne.append(keywords[ChosenKeyword]) # choosing the keyword
   RandDefCount = 0
   while RandDefCount < 2: # adding two random keywords to the list
      defsOne.append(keywords[random.choice(words)])
      RandDefCount += 1
   random.shuffle(defsOne) …