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How to Deploy a Flask app on Heroku.

Trilochan Parida on July 04, 2020

Hello Friends, In this article I will show you how to deploy a flask app on Heroku. Follow the below steps to deploy your python flask app on H...
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Jon Nordland •

Thank you, Very good. More people should focus on succinct explanations like this.

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Trilochan Parida •

I am glad you like it :)

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Kirtan Magan •

Thanks omg you are thebest =ever!!!!1!!!!

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Thomas Rettig •

OMG!!! THANK YOU SO MUCH!!! I was spending the past few days struggling to deploy my Flask app to Heroku, and then I stumbled across your article. After a few modifications, the site is now in production! :D

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The Phantom Coder •

Thanks, this was quick and easy and it worked perfectly for me.

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Edung Divinefavour •

Super useful!!!!!!!!!

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Luv2bnanook44 •

thank you!!!

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Pathum Lakshan •

Neat work Thanks lot

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billy_dev •

I like the tutorial, Thank you.
My question is how do is set a port and a database that isn't a local storage on like: sqlite, to using postgresql?

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Hanzala Khan •

Hey I have a simple endpoint on my Herokuapp bloggir.herokuapp.com/d and i want to fetch it with JS fetch API, it is giving an error.please help

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Mohsin Ashraf •

Thanks great tutorial.

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zeybep •

Hi,
Firstly thank you very much ... I have to python files and they are in the same folder, named app folder... one is main.py and the other is sendemail1.py and there is wsgi.py file under the virtual directory. But when i run the wsgi.py it gives me the ModuleNotFoundError: No module named 'sendemail1' error so i can not push to heroku...

my wsgi.py is;

from app.main import app

if name == "main":
app.run()

main.py file is:

from flask import Flask, render_template, request
from flask_sqlalchemy import SQLAlchemy
from sendemail1 import sendemail

from sqlalchemy.sql import func
...
app= Flask(name)
app.config['SQLALCHEMY_DATABASE_URI']='postgresql://postgres:123456@localhost/height_collector'

class Data(db.Model):
tablename="data"
id=db.Column(db.Integer,primary_key=True)
email_=db.Column(db.String(120),unique=True)
height_=db.Column(db.Integer)

def __init__(self,email_,height_):
    self.email_=email_
    self.height_=height_
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@app.route("/")
def index():
return render_template("index.html")

@app.route("/success",methods=['POST'])
def success():
if request.method=='POST':
email=request.form["email_name"]
height=request.form["height_name"]

    print(email)
    if  db.session.query(Data).filter(Data.email_ == email).count() == 0:
        data=Data(email,height)
        db.session.add(data)
        db.session.commit()
        #average calculate

        avg_height=db.session.query(func.avg(Data.height_)).scalar()
        avg_height=round(avg_height,1)
        print(avg_height)
        count = db.session.query(Data.height_).count()
        sendemail(email,height,avg_height,count)

        return render_template("success.html")

return render_template("index.html",
text="Seems like there is an email already :)")
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if name=='main':
app.debug=True
app.run()

sendemail1.py file is

from email.mime.text import MIMEText
import smtplib

def sendemail(email,height,avg_height,count):
from_email="usertestblabla@gmail.com"
from_password="eee134566"
to_email=email

subject="Height Data"
message ="Hey , your height is <strong> %s. <strong> Average height of all is %s and calculated out <strong> %s <strong> of people. " % (height, avg_height,count)

msg = MIMEText(message,'html')
msg['Subject']=subject
msg['To']=to_email
msg['From']=from_email

gmail=smtplib.SMTP('smtp.gmail.com',587)
gmail.ehlo()
gmail.starttls()
gmail.login(from_email,from_password)
gmail.send_message(msg)
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thank you very much

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zeybep •

Hi again,
i found the error...It is because i have to write the import like this
from app.sendemail1 import sendemail to the main.py
than it works
have a great day

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davidkiama •

Thanks mate!

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Sara García •

Thank you so much!! Very well explained

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Dasith Rathnasinghe •

Thank you. very useful