Python split() 复制

Question

我目前正在尝试复制拆分功能。我环顾四周，发现一个有很大帮助的，代码的唯一问题是空字符串没有显示为空，而是它们有多个撇号用于多个不同的空字符串。当前代码是

def mysplit(strng):

    words = []
    current_word = " "
    for char in strng:
        if char == " ":
            words.append(current_word)
            current_word = ""
        else:
            current_word += char

    words.append(current_word)
    return words


    print(mysplit("To be or not to be, that is the question"))
    print(mysplit("To be or not to be,that is the question"))
    print(mysplit("   "))
    print(mysplit(" abc "))
    print(mysplit(""))

输出的结果

[' To', 'be', 'or', 'not', 'to', 'be,', 'that', 'is', 'the', 'question']
[' To', 'be', 'or', 'not', 'to', 'be,that', 'is', 'the', 'question']
[' ', '', '', '']
[' ', 'abc', '']
[' ']

我正在尝试得到结果

['To', 'be', 'or', 'not', 'to', 'be,', 'that', 'is', 'the', 'question']
['To', 'be', 'or', 'not', 'to', 'be,that', 'is', 'the', 'question']
[]
['abc']
[]

Answer 1

def mysplit(strng):
    words = []
    if(len(strng)== 0 or strng.isspace()):
        return words
        
    current_word = " "
    for char in strng:
        if char == " ":
                words.append(current_word)
                current_word = ""
        else:
            
            current_word += char

    
    words.append(current_word)
    for w in words:
        if(w.isspace() or len(w)==0):
            words.remove(w) 
    
    return words


print(mysplit("To be or not to be, that is the question"))
print(mysplit("To be or not to be,that is the question"))
print(mysplit("   "))
print(mysplit(" abc "))
print(mysplit(""))

Answer 2

首先，您应该在返回单词之前删除 words.append(current_word)。

然后你可以添加一个 if 使用 strip 函数来删除字符串前面和结尾的空格（https://www.journaldev.com/23625/python-trim-string-rstrip-lstrip-strip）

if char is " ":
    need_to_append, stripped_word = should_append(current_word)
    if need_to_append:
        words.append(stripped_word)
    current_word = ""

最终版本：

def should_append(word):
    stripped_word = word.strip()
    return stripped_word != "", stripped_word

def mysplit(strng):
    words = []
    current_word = " "
    for char in strng:
        if char is " ":
            need_to_append, stripped_word = should_append(current_word)
            if need_to_append:
                words.append(stripped_word)
            current_word = ""
         else:
            current_word += char
    need_to_append, stripped_word = should_append(current_word)
    if need_to_append:
        words.append(stripped_word)
    return words

Answer 3

您有几个问题。请查看我的解决方案

def mysplit(strng):

    words = []
    current_word = ""
    for char in strng:
        if char == " ":
            if current_word:
                words.append(current_word)
            current_word = ""
        else:
            current_word += char

    if current_word:
        words.append(current_word)
    return words


print(mysplit("To be or not to be, that is the question"))
print(mysplit("To be or not to be,that is the question"))
print(mysplit("   "))
print(mysplit(" abc "))
print(mysplit(""))

Answer 4

你可以使用 enumerate 和 zip 来实现：

def mysplit(string):
    spaces = [ i for i,c in enumerate(string) if c==" " ] # indexes of spaces
    subs   = [ string[s+1:e] for s,e in zip([-1]+spaces,spaces+[len(string)]) ]
    return [ s for s in subs if s ] # filter out empty strings

Answer 5

当您找到分隔符（空格）时，还需要检查是否有要添加的正确的非空白词。

    if char == " ":
        words.append(current_word)
        current_word = ""

应该是

    if char == " ":
        if current_word:    # If there is anything to append, do so.
            words.append(current_word)
        current_word = ""