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import collections
import csv
from datetime import datetime

def analytic_1():
    site_dict = collections.defaultdict(set)
    largest_number, site_ids = 0, []
    with open('SWE sample data - Q3 data.csv') as csv_file:
        csv_reader = csv.reader(csv_file)
        for row in csv_reader:

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import collections
import csv
import json

def mostPopularProduct():
    number_of_purchasers = collections.defaultdict(int)
    quantity_of_goods = collections.defaultdict(int)
    most_purchasers, most_quantities = 0, 0
    most_purchasers_prod_ids, most_quantities_prod_ids = [], []
    with open('SWE sample data - Q2 data.csv') as csv_file:

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def equalsWhenOneCharRemoved(x, y):
    i, j = len(x), len(y)
    if abs(i - j) == 1:
        for k in range(max(i, j)):
            if x[k] != y[k]:
                return equalsWhenOneCharRemoved(x[k+1:], y[k:]) or \
                         equalsWhenOneCharRemoved(x[k:], y[k+1:])
    elif i == j:
        for k in range(i):
            if x[k] != y[k]:

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Fetch API Examples

Table of Contents

1. GET Requests
   1. Easy: Get JSON from a URL
   2. Intermediate: Custom headers
   3. Advanced: CORS example
2. POST/PUT Requests
   1. Easy: Posting JSON

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Latency Comparison Numbers
--------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

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Set up Django, Nginx and Gunicorn in a Virtualenv controled by Supervisor

Steps with explanations to set up a server using:

• Virtualenv
• Virtualenvwrapper
• Django
• Gunicorn

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Flask Gunicorn Supervisor Nginx 项目部署小总结

服务器的基本连接和配置

SSH 连接

使用公钥私钥来登陆而不是账号密码，公钥私钥需要简单的在本地生成一下。Github 的生成 SSH 公钥私钥的教程：Generating SSH keys

可能需要使用 -i 参数选择一下本地的私钥，一个示例的 ssh 连接如下：

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import smtplib
from getpass import getpass

def prompt(prompt):
    return input(prompt).strip()

fromaddr = prompt("From: ")
toaddrs  = prompt("To: ").split()
subject  = prompt("Subject: ")
print("Enter message, end with ^D (Unix) or ^Z (Windows):")