wget -O - "https://www.worldometers.info/coronavirus/worldwide-graphs/" | grep "Currently Infected" -A 4 | grep data: | sed 's/^[^\[]*//' | sed 's/[]].*}/]/' | ./percentagechange.py



#!/usr/bin/env python3
import sys
import json

# loop boilerplate
def skipper(sk):
    def s():
        nonlocal sk
        if (sk > 0):
            sk -= 1
            return True
        return False
    return s

# load data from stdin and parse as JSON
sData = ""
for line in sys.stdin:
    sData += line
jData = json.loads(sData)

# convert data and append to output array
# calculate initial case outside loop
skip = skipper(1)
pData = [100] # for sake of argument, 0 --> whatever is a 100% increase
last = jData[0]
for i in jData:
    if ( skip() ): continue #don't calculate initial case inside loop
    percentageChange = ( ((i*100)/last) -100 )
    percentageChange = round(percentageChange,2)
    pData.append ( percentageChange)
    last = i

# print output array, by coincidence this is valid JSON
print (pData)