Streamlit Application Deployment

Surendra Reddy

3 min readOct 25, 2020

How to Deploy StreamlitApp?

Prerequisites

Requirements.txt file
Github account
Access to [share.streamlit.io](http://share.streamlit.io/)

Detailed Steps

1. Run the command “pip freeze > requirements.txt” (Traditional way — Not recommended due to other packages)

Alternate(Recommended) way install the package

a) pip install pipreqs

b) open the command prompt and run pipreqs ‘path of the python file’
Eg:- pipreqs C:\projects\streamlit or ‘pipreqs .\’

2. Commit app.py in to github repository. Use any of the sample code below,

Convert Image to Pencil Sketch Image — Code

# Image to Pencil sketch app  import streamlit as st
  import numpy as np
  from PIL import Image
  import cv2

  st.set_option('deprecation.showfileUploaderEncoding', False)

  def dodgeV2(x, y):
      return cv2.divide(x, 255 - y, scale=256)

  def pencilsketch(inp_img):
      img_gray = cv2.cvtColor(inp_img, cv2.COLOR_BGR2GRAY)
      img_invert = cv2.bitwise_not(img_gray)
      img_smoothing = cv2.GaussianBlur(img_invert, (21, 21),sigmaX=0, sigmaY=0)
      final_img = dodgeV2(img_gray, img_smoothing)
      return(final_img)

  st.title("PencilSketcher App")
  st.write("This Web App is to help convert your photos to realistic Pencil Sketches")

  file_image = st.sidebar.file_uploader("Upload your Photos", type=['jpeg','jpg','png'])

  if file_image is None:
      st.write("You haven't uploaded any image file")

  else:
      input_img = Image.open(file_image)
      final_sketch = pencilsketch(np.array(input_img))
      st.write("**Input Photo**")
      st.image(input_img, use_column_width=True)
      st.write("**Output Pencil Sketch**")
      st.image(final_sketch, use_column_width=True)

Simple App — Code

import streamlit as st

  def main():
      st.title('App Deployment')
      st.subheader("Welcome to simple streamlit app")
      st.text("Simple example")
      st.balloons()

  if __name__ == '__main__':    
      main()

3. Login to https://share.streamlit.io/ and Select the github project.

Login to https://share.streamlit.io/ using github credentials and click on ‘New app’.
Enter the github repository, branch and file name (app.py) and click on ‘Deploy’.
Once deployment is successful it will generate the url https://share.streamlit.io/githubuser/projectname/application.py or https://share.streamlit.io/[user name]/[repo name]
Click on ‘vertical dots’ or ‘manageapp’ to show the details of the application log.

Refer the screenshots below,