Financial Tools in Python

This repository comprises python utilities such as command line style stock profit calculator and real-time stock price fetcher.

Stock Profit Calculator

Run the program:

python ./command_utilities/cmdCalculator.py

The calculator is a cmd-like program that will take the following inputs:

• A stock symbol
• Allotment (number of shares)
• Final share price (in dollars)
• Sell commission (in dollars)
• Inital share price (in dollars)
• Buy commission (in dollars)
• Captial gain tax rate (in %)

then output the following items after computation:

• Proceeds (Allotment x Final share price)
• Cost (Allotment x Initial Share Price + commissions + Tax on Capital Gain)
• Net Profit (in dollars)
• Return on investment (in %)
• Break even price (in dollars)

Screenshot of input and output:

Real-time Stock Price Fetcher

Before June 2017, Most of the real-time stock price fetching tools depends on Yahoo Finance API, which has been abandoned by its owner in the middle of 2017. In order to get the real-time stock price, I analyzed Google Finance web pages and discovered a relatively stable and simple way to fetch all the necessary values from HTML meta data.

Of course the page view may change in the future, though, I believe this program method will probably work fine as long as Google keeps their meta tags. For example:

<meta content="Apple Inc." itemprop="name">
<meta content="https://www.google.com/finance?cid=22144" itemprop="url">
<meta content="https://www.google.com/finance/chart?cht=g&amp;q=NASDAQ:AAPL&amp;tkr=1&amp;p=1d&amp;enddatetime=2017-11-03T16:00:01Z" itemprop="imageUrl"/>
<meta content="AAPL" itemprop="tickerSymbol"/>
<meta content="NASDAQ" itemprop="exchange"/>
<meta content="America/New_York" itemprop="exchangeTimezone"/>
<meta content="172.50" itemprop="price"/>
<meta content="+4.39" itemprop="priceChange"/>
<meta content="2.61" itemprop="priceChangePercent"/>
<meta content="true" itemprop="isAfterHours"/>
<meta content="172.40" itemprop="afterHoursPrice"/>
<meta content="-0.10" itemprop="afterHoursPriceChange"/>
<meta content="-0.06" itemprop="afterHoursPriceChangePercent"/>
<meta content="2017-11-03T23:59:45Z" itemprop="afterHoursQuoteTime"/>
<meta content="2017-11-03T16:00:01Z" itemprop="quoteTime">
<meta content="NASDAQ real-time data" itemprop="dataSource">
<meta content="//www.google.com/help/stock_disclaimer.html#realtime" itemprop="dataSourceDisclaimerUrl">
<meta content="USD" itemprop="priceCurrency">

We can get values like price, priceChange, and priceChangePercent directly from the attributes in meta tags.

Run the program:

python ./command_utilities/financialInfo.py

This program will take a stock symbol as input and output the following:

• Current date and time
• Full name of the company
• Stock price
• Value changes (+ for increase and - for decrease)
• Percentage changes (+ for increase and - for decrease)

A typical use case looks like:

Input:
Please enter a symbol ('exit' to quit) :
ADBE
Output:
Sat Nov  4 03:42:50 2017
Adobe Systems Incorporated (ADBE)
182.30 +1.36 (0.75)

Screenshot of input and output:

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Copyright (C) 2017 Mutian Wang, licensed under the MIT License