Data Science Essentials in Python: Collect - Organize - by Dmitry Zinoviev

By Dmitry Zinoviev

Go from messy, unstructured artifacts saved in SQL and NoSQL databases to a neat, well-organized dataset with this quickly reference for the busy facts scientist. comprehend textual content mining, laptop studying, and community research; procedure numeric facts with the NumPy and Pandas modules; describe and examine facts utilizing statistical and network-theoretical equipment; and notice real examples of information research at paintings. This one-stop answer covers the basic info technological know-how you wish in Python.

Data technological know-how is among the fastest-growing disciplines by way of educational learn, scholar enrollment, and employment. Python, with its flexibility and scalability, is readily overtaking the R language for data-scientific tasks. retain Python data-science innovations at your fingertips with this modular, fast connection with the instruments used to procure, fresh, examine, and shop data.

This one-stop answer covers crucial Python, databases, community research, common language processing, components of laptop studying, and visualization. entry dependent and unstructured textual content and numeric info from neighborhood records, databases, and the web. set up, rearrange, and fresh the knowledge. paintings with relational and non-relational databases, info visualization, and easy predictive research (regressions, clustering, and selection trees). See how standard info research difficulties are dealt with. and check out your hand at your individual ideas to a number of medium-scale initiatives which are enjoyable to paintings on and glance solid in your resume.

Keep this useful quickly consultant at your aspect no matter if you are a scholar, an entry-level information technological know-how specialist changing from R to Python, or a professional Python developer who does not are looking to memorize each functionality and option.

What You Need:

You want a respectable distribution of Python 3.3 or above that incorporates not less than NLTK, Pandas, NumPy, Matplotlib, Networkx, SciKit-Learn, and BeautifulSoup. an outstanding distribution that meets the necessities is Anaconda, on hand at no cost from www.continuum.io. in the event you plan to establish your individual database servers, you furthermore may want MySQL (www.mysql.com) and MongoDB (www.mongodb.com). either applications are unfastened and run on home windows, Linux, and Mac OS.

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It dates back to 1972 and is a format of choice for Microsoft Excel, Apache OpenOffice Calc, and other spreadsheet software. S. government website that provides access to publicly available data, alone provides 12,550 data sets in the CSV format. A CSV file consists of columns representing variables and rows representing records. ) The fields in a record are typically separated by commas, but other delimiters, such as tabs (tab-separated values [TSV]), colons, semicolons, and vertical bars, are also common.

From the Python point of view, a regular expression is simply a string containing the description of a pattern. compile(pattern, flags=0) Compilation substantially improves pattern matching time but doesn’t affect correctness. If you want, you can specify pattern matching flags, either at the time of compilation or later at the time of execution. M (tells re to work in a multiline mode, and lets the operators ^ and $ also match the start or end of line). If you want to combine several flags, simply add them.

TO 'dsuser'@'localhost'; Now, it’s time to create a new table in an existing database. Use the same mysql client, but log in as a regular database user: report erratum • discuss Setting Up a MySQL Database • 49 c:\myProject> mysql -u dsuser -p dsdb Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. «More mysql output» mysql> Typically a table is created once and accessed many times. You can later change the table’s properties to accommodate your project needs. The command CREATE TABLE, followed by the new table name and a list of columns, creates a new table.

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