from flask import Flask, render_template, request

app = Flask(__name__)
line = 'default'


@app.route('/', methods=['GET', 'POST'])
def index():
    global line
    if request.method == 'POST':
        line = request.form['line']
    return render_template('index.html', line=line)


@app.route('/get-line')
def get_line():
    return line


if __name__ == '__main__':
    app.run()