app.py

try:
    from flask import Flask

    from flask import Flask, request, render_template, redirect, url_for, session, send_file

    from flask_wtf import FlaskForm, RecaptchaField
    from wtforms import StringField, SubmitField, RadioField, DateTimeField, SelectField, TextAreaField

    from wtforms.validators import DataRequired

    from flask import session
    from flaskext.markdown import Markdown
    from arc_eager import Process
    import os

except Exception as e:
    print(e)
    print("Some Modules are Missing")

app = Flask(__name__)
Markdown(app)
app.config["SECRET_KEY"] = 'mysecretkey'


class Widgets(FlaskForm):

    Statement = StringField(label="STATEMENT")

    submit = SubmitField(label="Submit")


def foo(value):
    print("Work to be done")


@app.after_request
def add_header(r):
    """
    Add headers to both force latest IE rendering engine or Chrome Frame,
    and also to cache the rendered page for 10 minutes.
    """
    r.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
    r.headers["Pragma"] = "no-cache"
    r.headers["Expires"] = "0"
    r.headers['Cache-Control'] = 'public, max-age=0'
    return r

@app.route("/", methods=["GET", "POST"])
def home():

    form = Widgets()
    if request.method == 'POST':
        if (form.validate_on_submit()):
            val = form.Statement.data
            print(val)
            session['data'] = val
            # return render_template('home.html', form=form)
            return redirect('/thanks')
    return render_template('home.html', form=form)


@app.route("/thanks", methods=["GET", "POST"])
def thanks():
    val = session['data']
    txt, err = Process(val)
    txt = txt.split('\n')
    # newval = foo(val)
    ex = [{
        "words": [
            {"text": "This", "tag": "DT"},
            {"text": "is", "tag": "VBZ"},
            {"text": "a", "tag": "DT"},
            {"text": "sentence", "tag": "NN"}
        ],
        "arcs": [
            {"start": 0, "end": 1, "label": "nsubj", "dir": "left"},
            {"start": 2, "end": 3, "label": "det", "dir": "left"},
            {"start": 1, "end": 3, "label": "attr", "dir": "right"}
        ]
    }] 
    
    return render_template('thanks.html',user_image='/static/process.png',text=txt,show= not err)


if __name__ == "__main__":
    app.run(debug=True)