python – Page 16

Read ini config file in Python

December 3, 2019

import configparser
config = configparser.ConfigParser()
config.read('example.ini')
config['DEFAULT']['Compression']

References
https://docs.python.org/3/library/configparser.html

Extract file name from path in Python

December 3, 2019

import ntpath
import os

filename = "templates - original/001.png"
print(ntpath.basename(filename))
print(os.path.basename(filename))
print(os.path.split(filename))
print(os.path.splitext(filename))
print(os.path.splitext(os.path.basename(filename)))
print(os.path.splitext(os.path.basename(filename))[0])

output

001.png
001.png
('templates - original', '001.png')
('templates - original/001', '.png')
('001', '.png')
001

References
https://stackoverflow.com/questions/8384737/extract-file-name-from-path-no-matter-what-the-os-path-format

Iterate over rows in a DataFrame in Pandas

December 3, 2019

# import pandas package as pd 
import pandas as pd 
  
# Define a dictionary containing students data 
data = {'Name': ['Ankit', 'Amit', 'Aishwarya', 'Priyanka'], 
                'Age': [21, 19, 20, 18], 
                'Stream': ['Math', 'Commerce', 'Arts', 'Biology'], 
                'Percentage': [88, 92, 95, 70]} 
  
# Convert the dictionary into DataFrame 
df = pd.DataFrame(data, columns = ['Name', 'Age', 'Stream', 'Percentage']) 
  
print("Given Dataframe :\n", df) 
  
print("\nIterating over rows using iterrows() method :\n") 
  
# iterate through each row and select  
# 'Name' and 'Age' column respectively. 
for index, row in df.iterrows(): 
    print (row["Name"], row["Age"])

References
https://www.geeksforgeeks.org/different-ways-to-iterate-over-rows-in-pandas-dataframe/

Read Excel file in Pandas

December 3, 2019

import pandas as pd

excel_file = 'movies.xls'
movies = pd.read_excel(excel_file)

movies_sheet1 = pd.read_excel(excel_file, sheetname=0, index_col=0)

References
https://www.dataquest.io/blog/excel-and-pandas/

Set title and location of plot in Bokeh

December 1, 2019

p.title.text = title
p.title_location = "above"

References
http://docs.bokeh.org/en/1.3.2/docs/user_guide/styling.html#title

Set X and Y axis labels in Bokeh

December 1, 2019

p = figure(width=300, height=300, x_axis_label='Initial xlabel')
p.xaxis.axis_label = 'New xlabel'

References
https://stackoverflow.com/questions/24131501/x-and-y-axis-labels-for-bokeh-figure

Run Flask on Windows

December 1, 2019

set FLASK_APP=app.py
set FLASK_ENV=development
REM set FLASK_ENV=production
set FLASK_DEBUG=TRUE
venv\Scripts\python.exe -m flask run --host=0.0.0.0 --port=14002

References
https://flask.palletsprojects.com/en/1.1.x/quickstart/
https://flask.palletsprojects.com/en/1.0.x/cli/
https://flask.palletsprojects.com/en/1.1.x/config/
https://stackoverflow.com/questions/29882642/how-to-run-a-flask-application

Configure bokeh plot to have responsive size

November 30, 2019

p.sizing_mode = "scale_both"

References
https://docs.bokeh.org/en/latest/docs/user_guide/layout.html#sizing-mode

Embedding Bokeh plots using iframe

November 30, 2019

Embedding a single plot at a time with output_file()

<iframe src="/assets/img/Bokeh/flowers.html"
    sandbox="allow-same-origin allow-scripts"
    width="100%"
    height="500"
    scrolling="no"
    seamless="seamless"
    frameborder="0">
</iframe>

References
https://p-mckenzie.github.io/2017/12/01/embedding-bokeh-with-github-pages/

Enable CORS in flask

November 30, 2019

from flask import Flask
from flask_cors import CORS, cross_origin
app = Flask(__name__)
cors = CORS(app)
app.config['CORS_HEADERS'] = 'Content-Type'

@app.route("/")
@cross_origin()
def helloWorld():
  return "Hello, cross-origin-world!"

References
https://stackoverflow.com/questions/25594893/how-to-enable-cors-in-flask