needtobe

到达后的代码 counter == 10 因为无限而被再次执行 while data 陈述。请注意,那 break 无法逃脱 while 这里的陈述,是为了 for i in range(num_page_items) .

请使用以下代码:

# notice lack of while data statement
for item in data:
    browser.get('https://duckduckgo.com/?q='+item+'&t=h_')
    results = browser.find_elements_by_id('links')
    num_page_items = len(results)
    for i in range(num_page_items):
        mylist = results[i].text
        row=len(ws1['A']) + 1
        ws1.cell(row=1,column=1,value="Results")
        ws1.cell(row=row,column=1,value=mylist)
        book.save(path)
        counter += 1
        print(counter)
        if counter==10:
            break

没有理由实例化所有字段都设置为“无”的对象。 我会检查一下 __init__ 像这样:

class PhoneNumber:
    def __init__(self, number_raw):
        number = int(number_raw)  # do not catch exception here, catch it on instantiation
        number_str = str(number)  # parse to str for slicing

        self.areaCode = number_str[0:3]  # note no space around slicing indexes
        self.exchange = number_str[3:6]
        self.line = number_str[6:13]

另外,值得注意的是使用pep-8类变量,所以使用 area_code 而不是 areaCode .

第二种方式(使用ClassMethod)

如果你需要回来 None 出于某些原因,您可能会发现使用ClassMethod实例化很有用,例如:

class PhoneNumber:
    def __init__(self, number_raw):
        self.areaCode = number_raw[0:3] 
        self.exchange = number_raw[3:6]
        self.line = number_raw[6:13]

    @classmethod
    def instantiate_with_checks(cls, number_raw):
        try:
            int(number_raw)
        except ValueError:
            return None
        # after ensuring that provided variable is valid
        return cls(number_raw)

实例化新 PhoneNumber 像这样的对象: PhoneNumber.instantiate_with_checks(number_raw) .

第三种方式(使用 __new__ ):

class PhoneNumber:
    def __init__( self, number_raw ):
        self.area_code = number[0:3]
        self.exchange = number[3:6]
        self.line = number[6:13]

    @classmethod
    def is_number_valid(cls, number_raw):
        try:
            int(number_raw)
        except ValueError:
            return False
        return True

    def __new__(cls, number_raw):
        if cls.is_number_valid(number_raw):
            return super().__new__(cls)