[英]Quadratic Equation with Python and Flask
所以目前我正在嘗試使用 flask 制作一個程序,但是當我運行它時出現TypeError
,說The view function for 'post_factors' did not return a valid response. The function either returned None or ended without a return statement.
The view function for 'post_factors' did not return a valid response. The function either returned None or ended without a return statement.
我不知道如何解決它。 這是代碼:
import math
def dofactors(a, b, c):
a = int(a)
b = int(b)
c = int(c)
d = b**2-4*a*c # discriminant
if d < 0:
result = 'No solutions'
elif d == 0:
x1 = -b / (2*a)
result = f'The sole solution is {str(x1)}'
else: # if d > 0
x1 = (-b + math.sqrt(d)) / (2*a)
x2 = (-b - math.sqrt(d)) / (2*a)
result = f'Solutions are {str(x1)} and {str(x2)}'
return(result)
和 HTML:
<!DOCTYPE html>
<form method="POST">
<p><h1>Factorizer</h1></p>
<p>please enter your variable values assuming the form ax^2+bx+c</p>
<input type="text", placeholder="a", name="a" oninput="this.value = this.value.replace(/[^0-9.-]/g, '').replace(/(\..*)\./g, '$1');" />
<input type="text", placeholder="b", name="b" oninput="this.value = this.value.replace(/[^0-9.-]/g, '').replace(/(\..*)\./g, '$1');" />
<input type="text", placeholder="c", name="c" oninput="this.value = this.value.replace(/[^0-9.-]/g, '').replace(/(\..*)\./g, '$1');" />
<input type="submit">
</form>
編輯:我忘了在主 class 中包含調用它的代碼,這里是:
@app.route('/factors')
def form_factors():
return render_template('factors.html')
和 POST function:
@app.route('/factors', methods=['POST'])
def post_factors():
a = str(request.form['a'])
b = str(request.form['b'])
c = str(request.form['c'])
dofactors(a, b, c)
您在dofactor
function 中返回值,但這些“返回”不適用於路由,因為它們在不同的 scope 中。您可以在post_factors
路由中使用以下內容解決此問題。
return(dofactors(a, b, c))
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