关于python 3.x：AttributeError：’tokenizer’对象没有属性’sent_tokenize’

AttributeError: 'tokenizer' object has no attribute 'sent_tokenize'

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当我运行以下代码时，会出现以下错误：AttributeError: 'tokenizer' object has no attribute 'sent_tokenize'在sentence_token= self.sent_tokenize(input_data)线上。

为什么会给我那个错误？

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from nltk.tokenize import sent_tokenize, \word_tokenize, WordPunctTokenizer
from nltk.corpus import brown
class tokenizer:
input_data=''
def __init__(self, input_data='', ):
self.input_data = input_data

def gen_SentTokenizers(self,input_data):
sentence_token= self.sent_tokenize(input_data) # Error!
return sentence_token

def gen_WordTokenizers(self, input_data):
word_token=self.word_tokenize(input_data)
return word_token

def gen_WordPunctToken(self, input_data):
word_PunctToken=self.WordPunctTokenizer().tokenize(input_data)
return word_PunctToken

if __name__=='__main__':
input_data = ' '.join(brown.words())
token1 = tokenizer()
token2 = tokenizer()
token3 = tokenizer()

token1.gen_SentTokenizers(input_data)
print("
Sentence tokenizer:")
print(token1)

token2.gen_WordPunctToken(input_data)
print("
Word punct tokenizer:")
print(token2)

token3.gen_WordTokenizers(input_data)
print("
Word tokenizer:")
print(token3)