PYTHON

how to display qr code in python

import os
import qrcode

img = qrcode.make("https://Your-URL-here")

img.save("qr.png", "PNG")

os.system("display qr.png")

python library to make qr codes

pip install qrcode[pil]

create qr code in python

# Import QRCode from pyqrcode
import pyqrcode
import png
from pyqrcode import QRCode
  
  
# String which represents the QR code
s = "www.codingforfree.com"
  
# Generate QR code
url = pyqrcode.create(s)
  
# Create and save the svg file naming "myqr.svg"
url.svg("myqr.svg", scale = 8)
  
# Create and save the png file naming "myqr.png"
url.png('myqr.png', scale = 6)

python qr generator

pip install qrcode[pil]

python qr decomposition

array = np.array([19, 14, 16, 13, 15,15,12,8,9,18,12,5 ]).reshape(4,3)
q,r = LA.qr(array)
r

# if diagonal exponent is zero, then v_i should be removed

qr decomposition python

#!/usr/bin/env python3

import numpy as np

def qr(A):
    m, n = A.shape
    Q = np.eye(m)
    for i in range(n - (m == n)):
        H = np.eye(m)
        H[i:, i:] = make_householder(A[i:, i])
        Q = np.dot(Q, H)
        A = np.dot(H, A)
    return Q, A

def make_householder(a):
    v = a / (a[0] + np.copysign(np.linalg.norm(a), a[0]))
    v[0] = 1
    H = np.eye(a.shape[0])
    H -= (2 / np.dot(v, v)) * np.dot(v[:, None], v[None, :])
    return H

# task 1: show qr decomp of wp example
a = np.array(((
    (12, -51,   4),
    ( 6, 167, -68),
    (-4,  24, -41),
)))

q, r = qr(a)
print('q:
', q.round(6))
print('r:
', r.round(6))

# task 2: use qr decomp for polynomial regression example
def polyfit(x, y, n):
    return lsqr(x[:, None]**np.arange(n + 1), y.T)

def lsqr(a, b):
    q, r = qr(a)
    _, n = r.shape
    return np.linalg.solve(r[:n, :], np.dot(q.T, b)[:n])

x = np.array((0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10))
y = np.array((1, 6, 17, 34, 57, 86, 121, 162, 209, 262, 321))

print('
polyfit:
', polyfit(x, y, 2))

python qr generator

import qrcode
img = qrcode.make('Some data here')
type(img)  # qrcode.image.pil.PilImage
img.save("some_file.png")