使用Flask路线捕获整数列表 [英] Capture a list of integers with a Flask route
问题描述
我正在尝试在Flask中实现一个基本的计算器.我定义了两个url参数,当我只想添加两个值时可以管理.但是,我想添加任意数量的值.如何在不编写无限长路由的情况下获取整数列表?
I'm trying to implement a basic calculator in Flask. I define two url parameters, which is manageable when I only want to add two values. However, I want to add any number of values. How can I get a list of integers without writing an infinitely long route?
@app.route('/add/<int:n1>,<int:n2>')
def add(n1,n2):
sum = n1+n2
return "%d" % (sum)
我试图用这段代码解决我的问题,但是它不起作用
I tried to solve my problem with this code, but it's not working
integer_list = []
@app.route('/add/integer_list')
def fun (integer_list):
sum = 0
for item in integer_list:
sum = sum + item
return '%d' % sum
推荐答案
Create a custom url converter that matches comma separated digits, splits the matched string into a list of ints, and passes that list to the view function.
from werkzeug.routing import BaseConverter
class IntListConverter(BaseConverter):
regex = r'\d+(?:,\d+)*,?'
def to_python(self, value):
return [int(x) for x in value.split(',')]
def to_url(self, value):
return ','.join(str(x) for x in value)
在 app.url_map.converters
上注册转换器.
app = Flask(__name__)
app.url_map.converters['int_list'] = IntListConverter
在路线中使用转换器. values
将是一个整数列表.
Use the converter in the route. values
will be a list of ints.
@app.route('/add/<int_list:values>')
def add(values):
return str(sum(values))
/add/1,2,3 -> values=[1, 2, 3]
/add/1,2,z -> 404 error
url_for('add', values=[1, 2, 3]) -> /add/1,2,3
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