> For the complete documentation index, see [llms.txt](https://flask-yushu.gitbook.io/yushu/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://flask-yushu.gitbook.io/yushu/3.-lan-tu-mo-xing-yu-codefirst/3.3-dan-lan-tu-duo-mo-kuai-chai-fen-shi-tu-han-shu.md).

# 3.3 单蓝图多模块拆分视图函数

蓝图，他的出发点，是为了分模块的。什么是模块级别的呢，比如一个web系统属于一个web模块；一个提供给移动端使用的api是一个api模块；一个内容管理系统是一个CMS。

我们不应该讲book,user这样的不同类别的py文件，做成多个蓝图（这样不是不行，只是小题大做了）

正确的方式是，在一个模块的初识文件中定义蓝图对象，这个模块的不同文件都引入这个蓝图对象来注册路由函数。并在模块的初始化文件中引入这些py文件来完成试图函数注册代码的执行

book.py

```python
from flask import jsonify
from helper import is_isbn_or_key
from yushu_book import YuShuBook

# 引入web模块
from . import web



@web.route("/book/search/<q>/<page>")
def search(q, page):
    """
    搜索书籍路由
    :param q: 关键字 OR isbn
    :param page: 页码
    """
    isbn_or_key = is_isbn_or_key(q)
    if isbn_or_key == 'isbn':
        result = YuShuBook.search_by_isbn(q)
    else:
        result = YuShuBook.search_by_key(q)

    return jsonify(result)
```

后面还会有user模块。我们这里先建立一段伪代码 user.py

```python
from . import web



@web.route("/user/login")
def login():
    return "success"
```

web/\_\_init\_\_.py

```python
from flask import Blueprint



web = Blueprint('web', __name__)

# 在这里导入不同文件，完成视图函数的注册
from app.web import book
from app.web import user
```


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