sohang3112

import os
import traceback
import smptlib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.utils import formatdate

# specify credentials in the below environment variables
EMAIL_SERVER = 'email-smtp.us-west-2.amazonaws.com'   # change this according to requirement
EMAIL_SERVER_PORT = 465

sohang3112

Clojure Helper Functions (misclleanous)

These 2 functions are from one of my incomplete projects: java-report-maker

(defmacro with-stdout [stdout & body]
  "Redirects stdout, executes body, and then resets stdout,
   NOTE: only works for Java methods, doesn't work with Clojure code"
  `(try
     (System/setOut ~stdout)
     ~@body
 (finally

sohang3112

# Build: docker build -t seleium_chrome -f selenium_chrome.dockerfile .
# Run: docker run selenium_chrome

FROM python:3.8

RUN apt-get update && apt-get install -y unzip

# Install chrome & chromedriver dependencies
# Source: https://github.com/puppeteer/puppeteer/blob/v5.5.0/docs/troubleshooting.md#chrome-headless-doesnt-launch-on-unix
#   see section "Debian Dependencies"

sohang3112

(defn plus [x] #(+ % x))
(defn minus [x] #(- % x))
(defn times [x] #(* % x))
(defn dividedBy [x] #(/ % x))

(def nums '[zero one two three four five six seven eight nine])

(defmacro def-num-func [num-sym num]
  `(defn ~num-sym
     ([] ~num)

sohang3112

# Ubuntu uses an old version of tldr-hs (0.6.4),
# in which `tldr --update` fails because it tries to pull from master branch of https://github.com/tldr-pages/tldr
# but its branch has been renamed to main
# Latest tldr-hs version (0.9.2) doesn't have this issue because it fetches as zip instead of via git
function tldr-update {
   cd ~/.local/share/tldr/tldr
   git fetch main
   git reset --hard origin/main
   git pull
   cd -

sohang3112

BQN

BQN is a modern array programming language that improves upon APL, J, etc. in various ways.

Install CBQN

CBQN is the primary implementation of BQN. It can be installed on Linux as follows:

$ git clone https://github.com/dzaima/CBQN.git
$ cd CBQN
$ make

sohang3112

SQL Practice in Jupyter Notebook using In-memory database

Note: An alternative to this is to use sqlite3 REPL in terminal, or else use a GUI like Sqlite Studio (in Database > Add a Database, enter database filename as :memory: to open in-memory temporary database).

• Install Jupyter SQL extension: pip install ipython-sql (can also try its fork: JupySQL)

Now use in Jupyter Notebook:

• %load_ext sql
• Create test table using in-memory database sqlite:///:memory: (all data will be lost after notebook is closed):

%%sql sqlite:///:memory:

sohang3112

from typing import List
from numbers import Number

def mov_zero_to_end_immutable(lst: List[Number]) -> List[Number]:
    """Returns new list in which all zeros are sent to the end of the list."""
    num_zeros = lst.count(0)
    return [x for x in lst if x != 0] + [0] * num_zeros

def mov_zero_to_end_mutable(lst: List[Number]) -> None:
    """Mutates list such that all zeros are sent to its end. 

sohang3112

from typing import List
from numbers import Number
from itertools import islice
from heapq import heapify, heappush, heappop, heappushpop

def nth_max(items: List[Number], n: int) -> Number:
  """Find Nth largest number from items list - eg. if n=7, finds 7th largest number.
  @param n: 1 <= n <= len(items)
  """
  # By default, heapq uses a min heap.

sohang3112

# TODO: test memory & performance against builtin set() containing natural numbers (1,2,..)
from typing import Iterable

class PositiveIntSet:
    """Set optimized for small positive integers (1,2,..)"""
    def __init__(self, elems: Iterable[int] = []):
        self._added = 0
        self._size = 0
        for x in elems:
            self.add(x)