yuchen-xue

import numpy as np

a = np.array([0, 3, 0, 1, 0, 1, 2, 1, 0, 0, 0, 0, 1, 3, 4])
unique, counts = numpy.unique(a, return_counts=True)
print(dict(zip(unique, counts)))

yuchen-xue

#include <opencv2/opencv.hpp>
using namespace cv;

int main() {
	Mat img = imread("image.jpg");
	namedWindow("test", WINDOW_NORMAL);
	imshow("test", img);
	waitKey(0);
	return 0;
}

yuchen-xue

"""
Since os.listdir returns filenames in an arbitary order, 
this function is very handy for generating well-ordered filenames list. 
Credit: https://stackoverflow.com/questions/4813061/non-alphanumeric-list-order-from-os-listdir/48030307#48030307
"""
import re
def sorted_alphanumeric(data):
    convert = lambda text: int(text) if text.isdigit() else text.lower()
    alphanum_key = lambda key: [convert(c) for c in re.split('([0-9]+)', key)] 
    return sorted(data, key=alphanum_key)

yuchen-xue

# https://bytebaker.com/2008/11/03/switch-case-statement-in-python/


def switch_(index_):
    def zero():
        print("You typed zero.\n")

    def sqr():
        print("n is a perfect square\n")

yuchen-xue

print("This will always be shown first\n")


def main():
    print("Calling first_module's main method\n")


if __name__ == '__main__':
    # the following will be shown only in `first_module.py`
    main()

yuchen-xue

list1 = [3, 2, 4, 1, 1]
list2 = ['three', 'two', 'four', 'one', 'one2']

zipped = zip(list1, list2)  # zip two lists
sorted_zip = sorted(zipped)  # sort
sorted_zip_comb = zip(*sorted_zip)  # unzip, then zip again

print(list(sorted_zip_comb))

yuchen-xue

from random import randint
from bitstring import BitArray

# `bin()` function explained
bin30 = bin(30)
print("--> bin30:\n", bin30)
print("--> type(bin30):\n", type(bin30))
print("--> int(bin30, 2):\n", int(bin30, 2))

# generate a long list of random binary numbers

yuchen-xue

import mymodule
print(mymodule.__doc__)
print(mymodule.f.__doc__)

yuchen-xue

from pathlib import Path

for img_file in Path('./JPEGImages').iterdir():
    with open('train.txt', 'w') as f:
        print(img_file.resolve(), file=f)

yuchen-xue

import urllib.request
import requests
from selenium import webdriver
from selenium.webdriver import ActionChains
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from bs4 import BeautifulSoup
import time