为什么我创建一个已有的word 对象，添加段落时，如果有段落样式的时候就报错

Question

from docx import Document # 导入docx基础库
from docx.enum.style import WD_STYLE_TYPE # 样式库
from docx.enum.text import WD_PARAGRAPH_ALIGNMENT # 对齐式库
from docx.shared import Pt # 单独调整几个字的样式
import os
import time

class WordOperate:
"""
World相关操作
"""
def init(self, failename=None):
"""
初始化函数
：failename：文件路径
"""
self.failename = failename
self.save_path = os.path.join(os.getcwd(), str(time.strftime('%Y%m%d%H%M%S',time.localtime(time.time()))), r'new_doc'+r'.docx')
if failename is None:
self.doc = Document()
else:
self.doc = Document(self.failename)

def read_text(self):
    """
    读取文档中text段落，返回list
    """
    try:
        paragraph_list = []
        for paragraph in self.doc.paragraphs:
            paragraph_list.append(paragraph.text)
        return paragraph_list
    except Exception as e:
        return print(e)

def read_table(self):
    """
    读取文档中表格，返回list
    返回格式[table[行[列数据]]]
    """
    try:
        tables = self.doc.tables
        table_rsult = []
        for i in range(len(tables)):
            table = tables[i]
            table_text = WordOperate.read_table_rows(table)
            table_rsult.append(table_text)
        return table_rsult
    except Exception as e:
        return print(e)

def read_table_rows(table):
    """
    读取table所有行数据
    """
    reust = []
    for rows in range(len(table.rows)):
        result_rows = WordOperate.read_table_columns(rows, table)
        reust.append(result_rows)
    return reust

def read_table_columns(rows, table):
    """
    读取一行所有列数据
    """
    result_rows = []
    for columns in range(len(table.columns)):
        result_row = table.cell(rows, columns).text
        result_rows.append(result_row)
    return result_rows

def write_heading(self, text, level=0):
    """
    添加标题
    ：text：标题内容
    ：level：标题级别，默认为0
    """
    self.doc.add_heading(text, level=level)

def write_paragraph(self, text, style='Normal'):
    """
    添加段落
    ：text：段落内容
    ：style：段落样式，默认Normal
    查看样式调用 search_paragraph_styles
    """
    paragraph = self.doc.add_paragraph(text, style=style)
    return paragraph

def write_text(self, text, paragraph, style=None):
    """
    段落后添加文字
    ：text：文字内容
    ：paragraph：需要追加文字的段落
    ：style：文字样式，默认Title Char
    查看样式调用 search_character_styles
    """
    if style is None:
        text = paragraph.add_run(text)
    else:
        text = paragraph.add_run(text, style=style)
    return text

def search_paragraph_styles(self):
    """
    查看段落样式调用
    """
    print('以下为段落样式：')
    for s in self.doc.styles:
        if s.type == WD_STYLE_TYPE.PARAGRAPH:
            print(s.name)

def search_character_styles(self):
    """
    查看字体样式调用
    """
    print('以下为字体样式：')
    for s in self.doc.styles:
        if s.type == WD_STYLE_TYPE.CHARACTER:
            print(s.name)

def write_picture(self):
    pass

def write_table(self):
    pass

def style_paragraph(self):
    pass

def style_character(self):
    pass

def save_word(self):
    if os.path.exists(self.save_path) is True:
        pass
    else:
        os.mkdir(os.path.join(os.getcwd(), str(time.strftime('%Y%m%d%H%M%S',time.localtime(time.time())))))
    self.doc.save(self.save_path)
    return print('文件保存成功，存储路径为：', self.save_path)

if name == "__main__":
docx = WordOperate(r'C:\Users\14836\OneDrive\Python学习\test\file\新建 Microsoft Word 文档.docx')
paragraph = doc.write_paragraph('5456465', 'ListNumber')
doc.write_text('wqqwqw', paragraph, 'Title Char')
docx.save_word()