我可以在python中的Lambda表达式内调用函数吗 [英] Can I call a function inside a Lambda expression in python

问题描述

我有一个包含if，else条件和for循环的函数.我想在lambda表达式中编写此函数.我尝试了多种方法来创建此lambda函数.但是我还是做不到.这是我的另一个规则.

I have a function with including if, else condition and for loop. I want to write this function inside a lambda expression. I tried from many ways to create this lambda function. But still I couldn't do it. This is my function with another rules.

negation ='no,not,never'.split(',')
list2 = 'miss,loss,gone,give up,lost'.split(',')

def f(sentence):
  s = sentence.split()
  l = [s.index(word) for word in s if word in list2]
# Will returns list of indices (of sentence) where word is in list2
   if len(l) > 0:
    for e in l:
        # Check previous word
        if s[e-1] not in negation:
            print 'sad'

我可以在lambda表达式中表达此功能吗，因为我开发了基于规则的分类器来从快乐，悲伤，愤怒之类的句子中检测情绪.以下是我的lambda函数.

Can I express this function inside a lambda expression since I developing a rule based classifier for detect emotion from a sentence like happy, sad, angry. Following is my lambda function.

rules = [(lambda x: word_tokenize(x)[-1] == '?', "neutral"),
         (lambda x: word_tokenize(x)[0] in question, "neutral"),
         (lambda x: any(word in list2 for word in [WordNetLemmatizer().lemmatize(word,'v') for word in word_tokenize(x)]), "sad"),
     (lambda x: any(word in list1 for word in [WordNetLemmatizer().lemmatize(word,'v') for word in word_tokenize(x)]), "happy")]

         print classify("I miss you", rules)

推荐答案

我只是创建一个函数来完成您需要做的所有事情(从您的评论中听起来像您想要的)，而不是将所有内容塞入lambda表达式中.以一定的顺序对句子应用某些规则).您始终可以在列表理解，映射，归约等方式中使用该函数.由于我不知道您的规则到底是什么，所以这是我可以提供的最佳示例:

Instead of cramming everything into a lambda expression, I would just create a function that did everything you need it to do (from your comment, it sounds like you want to apply certain rules to a sentence in a certain order). You can always use that function in list comprehension, map, reduce, etc. Since I don't know exactly what your rules are though, this is the best example I can give:

a = ["This is not a sentence. That was false.", 
     "You cannot play volleyball. You can play baseball.", 
     "My uncle once ate an entire bag of corn chips! I am not lying!"]
def f(paragraph):
    sentences = paragraph.split(".")
    result = []
    for i in range(len(sentences)):
        //apply rules to sentences
        if "not" in sentences[i]:
            result.append("negative")
        else:
            result.append("positive")
    return result
my_result = [f(x) for x in a]

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