Forem: Surendra Reddy

Discord Bot Python(🐍) & Hosting on Cloud (☁)

Surendra Reddy — Wed, 30 Dec 2020 16:31:30 +0000

Develop Discord bot using python and Deploy it on cloud. Below gitbook contains the detailed steps on how to build it.

https://surendraelectronics.gitbook.io/ups/discord-bot-python-and-hosting-on-cloud

Streamlit Code Running from Jupyter Notebook

Surendra Reddy — Thu, 12 Nov 2020 00:53:20 +0000

3 Simple Steps

...

Launch(Open) command prompt
Run the command,
- jupyter nbconvert –to script JupyterNotebookName.ipynb
- awk ‘!/ipython/’ JupyterNotebookName.py > temp.py && mv temp.py app.py && rm JupyterNotebookName.py
- streamlit run app.py
Open the url http://localhost:8501 (Browser)

References

Notebook: https://github.com/SurendraRedd/StreamlitProjects/blob/master/Streamlit.ipynb

App: https://github.com/SurendraRedd/StreamlitProjects/blob/master/app.py

Streamlit Digital Book

Surendra Reddy — Thu, 12 Nov 2020 00:40:30 +0000

Streamlit Digital Book contains details of the package installation, development & deployment of the streamlit application, sample codes and other information related to the streamlit.

Github: https://surendraredd.github.io/Books/
Preview: https://vimeo.com/476881584
Youtube: https://www.youtube.com/watch?v=z2u34-kuatI

How to Deploy StreamlitApp?

Surendra Reddy — Sun, 25 Oct 2020 17:42:02 +0000

Prerequisites
- Requirements.txt file
- Github account
- Access to share.streamlit.io

Detailed Procedure

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 .\'

Commit the app.py(code) files in to git hub repository. Refer the sample code in the Application section.

Application

Convert Image to Pencil Sketch Image

# 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

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 and file location as shown in the steps below,
- 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.

References https://docs.streamlit.io/en/stable/deploy_streamlit_app.html
GitHub & Documentation Details

# Python Coding Best Practises

Surendra Reddy — Wed, 07 Oct 2020 05:55:16 +0000

👉Best Practise 1 → Using enumerate() - Fetch elements from list

# List Variable
example = ['use','enumerate','instead','of','iteration']

# Ideal Way
for i in range(len(example)):
    print(f"# {i + 1}: {example[i]}")

# Enemurate
for i, value in enumerate(example, 1):
    print(f"# {i}: {value}")

👉Best Practise 2 → Using zip() - Fetch elements from multiple lists

# Lists 
Employees = ['Employee1','Employee2','Employee3','Employee4']
Age = [30,25,35,40]

# Ideal Way
for i in range(len(Employees)):
    employee = Employees[i]
    age = Age[i]
    print(f"Employee name is {employee} and age is {age}")

# Pythonic way - zip
for employee, age in zip(Employees, Age):
    print(f"Employee name is {employee} and age is {age}")

👉Best Practise 3 → Using reversed() - Fetch elements reversly

# Lists 
Employees = ['Employee1','Employee2','Employee3','Employee4']

# Ideal way
for i in range(1,len(Employees) + 1):
    print(f"Approach 1 - Employee came to office after covid 19 is {Employees[-i]}")
for employee in Employees[::-1]:
    print(f"Approach 2 - Employee came to office after covid 19 is {employee}")

# Pythonic way - reversed()
for employee in reversed(Employees):
    print(f"Using revered -  Employee came to office after covid 19 is {employee}")

👉Best Practise 4 → Using filter() - Data Filtering

# List
numbers = [1,2,3,4,5,6,7,8,9,10]

#Ideal way
for number in numbers:
    if number % 2:
        print(f"Odd Number : {number}")

# Pythonic way - filter()
for number in filter(lambda x: x %2, numbers):
    print(f"Odd Number : {number}")

👉Best Practise 5 → Using Chain() - Concatenate values from lists

from itertools import chain

#Lists
oddValues = [1,3,5,7,9]
evenValues = [2,4,6,8,10]

# Ideal way
values = oddValues + evenValues
for value in values:
    print(f"value is : {value}")

# Pythonic way - chain()
for value in chain(oddValues, evenValues):
    print(f"value is : {value}")

👉Best Practise 6 → Using Dictionaries() - Retrieve keys & values from dictionary

# Dict
Employees = {"Employee1": 30, "Employee2": 35, "Employee3": 40, "Employee4": 45}

#Ideal way
for key in Employees:
    print(f"Employee Name is : {key}")
for key in Employees.keys():
    print(f"Employee Name is : {key}")
for value in Employees.values():
    print(f"Age is : {value}")
for value in Employees:
    print(f"Age is : {Employees[value]}")

#Pythonic way
for key, value in Employees.items():
    print(f"Employee came to office after covid 19 is {key} and age is {value}")

👉Best Practise 7 → Using Comprehension() - Comprehensions for lists, dictionaries & set

### list
numbers = [1,2,3,4,5,6,7,8,9,10]

#Ideal way
squaredNumbers = list()
for square in numbers:
    squaredNumbers.append(square * square)
print(squaredNumbers)

#Using list comprehension
squaredNumbers = [x * x for x in numbers]
print(squaredNumbers)

#Ideal way
squaredNumbers = dict()
for square in numbers:
    squaredNumbers[square] = square * square

#Using list comprehension
squaredNumbers = {x: x*x for x in numbers}
print(squaredNumbers)

#Ideal way
squaredNumbers = set()
for square in numbers:
    squaredNumbers.add(square)
print(squaredNumbers)

#Using list comprehension
squaredNumbers = [x*x for x in numbers]
print(squaredNumbers)

👉Best Practise 8 → Using else clause - For and While Loops

# For Loop
for n in range(2, 10):
    for x in range(2, n):
        if n % x == 0:
            print( n, 'equals', x, '*', n/x)
            break
    else:
        # loop fell through without finding a factor
        print(n, 'is a prime number')

# While Loop
count = 2
while (count < 1):     
    count = count+1
    print(count) 
    break
else: 
    print("No Break")

👉Best Practise 9 → Accept Multiple Inputs, remove duplicates, call by reference..etc

# Tip1: Accept Multiple Inputs

# Traditional Approach

x = input("Enter Any Number: ")
print(x)

y = input("Enter Any Number: ") 
print(y)

z = input("Enter Any Number: ") 
print(z)

t = input("Enter Any Number: ") 
print(t)

p = input("Enter Any Number: ") 
print(p)

# Pythonic way
x,y,z,t,p = input("Enter Any Number: ").split(' ')
print(x,y,z,t,p)

# Tip2: Multi Condition Check

salary = 40000
age = 25
weight = 70

# Traditional Approach

if salary > 20000 and age > 20 and weight > 65:         
    print ("All conditions satisfied")

if salary > 20000 or age > 20 or weight > 65:
    print ("Any one condition is satisfied")

# Pythonic way using list

check = [
    salary > 20000,
    age > 20,
    weight > 65
]

if all(check):
    print("Pythonic way of checking conditions")

if any(check):
    print("Pythonic way of checking any one condition")

# Tip 3: swapping in python

# Traditional approach

x = "tip1"
y = 'tip2'

temp = x
x = y
y = temp

print(x,y)

# Pythonic way
x = 'tip3'
y = 'tip4'
x,y = y,x
print(x,y)

# Tip 4: Removing duplicates

# Traditional approach - with out list comprehension
numbers = [1,2,1,3,4,2,1,2,5,67,2,3,56,78,34,12,3,4,5,6,7,8]
result = []
for num in numbers:
    if num not in result:
        result.append(num)
print("final list is :" + str(result))

# with list comprehension
resultComp = []
[resultComp.append(num) for num in numbers if num not in resultComp]
print("final list using comprehension:" + str(resultComp))

# Pythonic way

# Using set
resultSet = list(set(numbers))
repeatedNumbers = max(set(numbers), key=numbers.count)
print("Using set final list is :" + str(resultSet))
print("Most repeated is :", repeatedNumbers)

# Using Dictionary
resultDict = list(dict.fromkeys(numbers))
repeatedNumbers = max(dict.fromkeys(numbers), key=numbers.count)
print("Most repeated is :", repeatedNumbers)
print("Using dictionary final list is :" + str(resultDict))

# Tip 5: Call by Reference

# Traditional way of implementing the sum function
def finalString(x,y):
    return x + y
print(finalString('Python is very simple',' to learn'))

# Using Pythonic way

def finalString1(*x):
    result = ''
    for s in x:
        result += s
    return result

print(finalString1('Python is very simple', ' to learn', ' and can be used \
in', ' Test Automation, Machine learning, Data Science, Web', \
'desktop apps development.'))

# Tip 6: Reverse String

# Traditional approach
s = 'python is fun to learn'
print(s[::-1])

# Pythonic way
s = 'python is fun to learn'[::-1]
print(s)

# Tip 7: Palidrome

checkString = input("Enter the string value :")
result = checkString.find(checkString[::-1])==0
if result:
    print("String is Palindrome " + str(result))
else:
    print("Not Palindrome")

Select Multiple files(random) from the folder in streamlit

Surendra Reddy — Fri, 14 Aug 2020 08:29:55 +0000

# File Selection Drop Down
import streamlit as st
import os
from typing import Dict


@st.cache(allow_output_mutation=True)
def get_static_store() -> Dict:
    """This dictionary is initialized once and can be used to store the files uploaded"""
    return {}

def file_selector(folder_path):
    filenames = os.listdir(folder_path)
    selected_filename = st.selectbox('Select a file', filenames)
    return os.path.join(folder_path, selected_filename)

def main():
    fileslist = get_static_store()
    folderPath = st.text_input('Enter folder path:')
    if folderPath:    
        filename = file_selector(folderPath)
        if not filename in fileslist.values():
            fileslist[filename] = filename
    else:
        fileslist.clear()  # Hack to clear list if the user clears the cache and reloads the page
        st.info("Select one or more files.")

    if st.button("Clear file list"):
        fileslist.clear()
    if st.checkbox("Show file list?", True):
        finalNames = list(fileslist.keys())
        st.write(list(fileslist.keys()))

main()