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Python—如何输出列表中包含一定数量字母的字符串

function list python-3.x

1

Pendle S · 技术社区 · 8 年前

使用Python3.7,我有一个包含各种长度字符串的列表。我尝试使用函数只返回两个字母的字符串-我的阈值。当我真的想打印“a”、“ab”和“ac”时,我现在得到的是“a”的单个字符串输出。我不知道我哪里出错了?我知道len(xStr)会计算字符串中的字母数,但我不知道如何正确使用它。

threshold = 2
def listOfWords(list):
    stringList = ["a", "ab", "abc", "ac", "abcd"]
    return stringList

def wordsInListsCounter():
    for elements in listOfWords(list):
        if len(elements) <= threshold:
            strLessThanThreshold = elements
            return strLessThanThreshold
        elif len(elements) == 0:
            emptyString = "There are no words in this list"
            return emptyString
        else:
            error = "There is invalid information"
            return error
print(wordsInListsCounter())

任何帮助都将不胜感激!!我是Python的新手。。。

2 回复 | 直到 8 年前

1

kevh 8 年前

>>> stringList = ["a", "ab", "abc", "ac", "abcd"]
>>> modifiedList = [x for x in stringList if len(x) <= 2]
>>> modifiedList
['a', 'ab', 'ac']

我编辑了我的答案,以便更好地匹配您的问题,下面是我要补充的内容:

threshold = 2
myList = ["a", "ab", "abc", "ac", "abcd"]

def wordsInListsCounter(stringList):
    elements = []
    for element in stringList:
        if len(element) <= threshold:
            elements.append(element)
    return elements

elements = wordsInListsCounter(myList)

if len(elements) == 0:
    print("There are no words in this list")

else:
    print(elements)

2

1

lyxal 8 年前

threshold = 2

def listOfWords(list):
    stringList = ["a", "ab", "abc", "ac", "abcd"]
    return stringList

def wordsInListsCounter():
    elements = listOfWords(list)

    if len(elements) != 0:
         strLessThanThreshold = [x for x in elements if len(x) <= threshold]
         return strLessThanThreshold

    elif len(elements) == 0:
        emptyString = "There are no words in this list"
        return emptyString

    else:
        error = "There is invalid information"
        return error

print(wordsInListsCounter())

但是,如果不想使用列表理解,可以使用以下方法:

threshold = 2
def listOfWords(list):
    stringList = ["a", "ab", "abc", "ac", "abcd"]
    return stringList

def wordsInListsCounter():
    strLessThanThreshold = []
    elements = listOfWords(list)

    for element in elements :
        if len(element) <= threshold:
            strLessThanThreshold.append(element)

    if len(elements) == 0:
        emptyString = "There are no words in this list"
        return emptyString

    return strLessThanThreshold

print(wordsInListsCounter())