路由的另一种表示，在类视图中会使用

from flask import Flask, make_responseapp = Flask(__name__)def hello():    return "Hello World!"app.add_url_rule('/hello', view_func = hello)if __name__ == '__main__':    app.run(debug=True)

视图函数与普通函数的区别

这里是返回 status code, content-type(在headers中默认是text/html)，所以当return ''时无回显，如下面，访问这个，会跳转到百度

from flask import Flask, make_responseapp = Flask(__name__)def hello():    # status code    # content-type(http headers text/html)    headers = {        'content-type':'text/plain',        'location':'http://baidu.com'    }    #response = make_response('', 301)    #response.headers = headers    #return response    return '', 301, headers    #return ""def helloo():    return "Hello World!"app.add_url_rule('/hello', view_func = hello)if __name__ == '__main__':    app.run(debug=True)

实战

编写一个书籍搜索，我这里先实现搜索分类，书籍搜索含关键字和isbn编号搜索，isbn分为isbn10 isbn13 前者有'-'，0-9组成，后面有0-9数字组成

from flask import Flaskapp = Flask(__name__)@app.route('/book/search//
     
      ')def search(q, page):    """        q  (isbn13 0-9  isbn10'-')        page    """    isbn_or_key = 'key'    if len(q) == 13 and q.isdigit():        isbn_or_key = 'isbn'    short_q = q.replace('-', '')    if '-' in q and len(short_q) == 10 and short_q.isdgit:        isbn_or_key = 'isbn'    passif __name__ == '__main__':    app.run()