最近我正在开发一个Web应用程序,使用Flask和sympy库。用户在文本区域中输入他的方程式,Flask将其作为字符串接收。我想通过使用sympy函数solve()来计算这个方程式的结果。但是为此,我必须将这个字符串转换为sympy表达式。我该怎么做?
from flask import Flask,request,render_template,flash
from sympy import *
from sympy.parsing.sympy_parser import *
x = symbols('x')
app = Flask(__name__)
app.secret_key = 'mysecretkey'
def calculate_():
first_eq = request.form['first_eq']
first_eq2= parse_expr(first_eq)
result = solve(first_eq2)
return result
@app.route("/",methods=['GET', 'POST'])
def myGet():
return render_template("my-form.html")
@app.route("/myPost/",methods=['GET', 'POST'])
def myPost():
answer = request.form['answer']
result_of_answer=solve(Eq(answer),x)
result = calculate_()
try:
if result == result_of_answer:
flash("you got it!")
else:
flash("no, it's wrong")
return render_template("my-form.html")
except:
flash("sorry, wrong type. Try again!")
return render_template("my-form.html")
if __name__ == '__main__':
app.run()
parse_expr
来将字符串s
转换为SymPy表达式,方法如下:http://docs.sympy.org/dev/modules/parsing.html - Avióndef calculate_(): first_eq = request.form['first_eq'] first_eq2= parse_expr(first_eq) result = solve(first_eq2) return result
- Vasilefirst_eq
的内容是什么?请在您的主贴中编辑您的代码。 - Avión