您混淆了使用捕获的url参数和<variable>使用访问的查询参数request.args。从路由定义中删除查询参数，然后在视图中访问它。
from flask import request
@app.route('/')
def index():
return render_template('index.html')
@app.route('/search')
def search():
search = request.args.get('search') # will be None if form wasn't submitted
# do something with search
return render_template('search.html', search=search)
index.html：
<form action="{{ url_for('search') }}">
<input name="search"/>
<input type="submit" value="Search"/>
</form>
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