app.py

from flask import Flask, request, render_template
from markupsafe import Markup

app = Flask(__name__)
@app.route('/', methods=['POST', 'GET'])
def index():
    if request.method == 'POST':
#        opt= passgenm(request.form['len'], request.form['num'])
        opt= passgen(request.form['len'])
        return render_template('result.html', result=Markup(opt))
    else:
        return render_template('index.html')


def passgenm(length,number):
    opt=""
    for i in range(int(number)):
        opt+=passgen(length)+"<br>\n"
    return opt

def passgen(length):
    import random
    import string
    length = int(length)
    password = ''
    for i in range(length):
        password += random.choice(string.ascii_letters + string.digits + string.punctuation)
    return password