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Martín Volpe martinvol

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Good as new
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@martinvol
martinvol / reverse.py
Last active September 21, 2015 19:28
How to reverse a linked-list using constant memory
def reverse(self):
if self.first == None or self.first.next == None:
# list is empty or has just one element,
# there's nothing to do
return
previous = None
current = self.first
next = current.next
@martinvol
martinvol / Get your wi-fi password from commad Line
Last active November 15, 2015 05:05
#!/bin/bash
current_network="$(iwgetid -r)"
if [[ -z $current_network ]]; then
echo "Not connected to network :("
exit
fi
echo Your network is $current_network
echo "$(sudo cat /etc/NetworkManager/system-connections/$current_network | grep ^psk= | sed "s/psk=/Password is: /")"
@martinvol
martinvol / webtask.js
Created January 11, 2017 22:56
Bitcoin index price API with up/down arrow
var request = require('request@2.27.0');
function get_rate(json_body){
// parse the response to get current price.
return json_body.bpi.USD.rate;
}
module.exports = function (ctx, done) {
var date = new Date();
var current_hour = date.getHours();
@martinvol
martinvol / creditcard.html
Last active May 31, 2017 02:24 — forked from rcdexta/creditcard.html
<div class="card"></div>
<form action="#">
<label>Credit Card Number </label>
<input type="text" name="number" />
<label>Expiration</label>
<input type="text" placeholder="MM/YY" name="expiry"/>
@martinvol
martinvol / hashme.py
Last active August 12, 2018 21:45
How to hash non-hashable and mutable objects in Python
class Node:
# ...
def __hash__(self):
return id(self)
my_node = Node()
my_hash = {my_node: "It's there!"}
print(my_hash[my_node])
@martinvol
martinvol / Dockerfile
Created October 15, 2019 10:12
Build Android app inside a Docker Container
FROM gradle:4.10.0-jdk8
USER root
ENV SDK_URL="https://dl.google.com/android/repository/sdk-tools-linux-3859397.zip" \
ANDROID_HOME="/usr/local/android-sdk" \
ANDROID_VERSION=25 \
ANDROID_BUILD_TOOLS_VERSION=27.0.3 \
ANDROID_ABI=armeabi-v7a \
AVD_NAME=Nexus_5X_API_28
@martinvol
martinvol / example.py
Created June 10, 2020 17:43
Connecting to the Celo Network from Python using web3
import web3
min_registry_abi = [
{
"name": "getAddressForString",
"constant": True,
"inputs": [{
"type": "string"
}],
"outputs": [{
@martinvol
martinvol / black-chocolate-metadata.json
Last active July 2, 2020 22:34
{"claims":[{"url":"https://black-chocolate.martinvol.com","timestamp":1593729237,"type":"ATTESTATION_SERVICE_URL"}],"meta":{"address":"0x02DC997790352E12fA90eb1A937dFeF4bF8Dbbc0","signature":"0xadb843fe4da0e949b0caa167adb65ac6145ffe02d2eec22896506865dd074b0d4687d0ddd2b9e3e004f9335c1690aa4f7aca5b740dd8fde3801d1cbc169f83c21c"}}
@martinvol
martinvol / garoto-metadata.json
Last active July 2, 2020 23:29
garoto-metadata.json
{"claims":[{"url":"https://garoto.martinvol.com","timestamp":1593732517,"type":"ATTESTATION_SERVICE_URL"}],"meta":{"address":"0xe34CD052e59fF830b286a125c52Dde568AC8BD48","signature":"0xb05bb1dd83f799fbe6b10289fb92679b492c4157f580f329b81a05e3b695ed2666226c19dffb4257077b9d1ec31010f8b347c1c9eae97cd141d0e622b24b46f01c"}}
@martinvol
martinvol / minimal_stripe_example.ts
Last active October 1, 2020 14:53
class Startup {
private static async example_payment() {
const headers = {
'Accept': 'application/json',
'Content-Type': 'application/x-www-form-urlencoded',
'Authorization': 'Basic ' + Buffer.from('sk_test_RNf1bOpZ1h6nN3tOucucRCMs').toString('base64')
}
// create a customer