Python for Everybody Exploring Data in Python 3 by Dr. Charles Russell Severance, Sue Blumenberg, Elliott

By Dr. Charles Russell Severance, Sue Blumenberg, Elliott Hauser, Aimee Andrion

Python for everyone is designed to introduce scholars to programming and software program improvement during the lens of exploring info. you could consider the Python programming language as your device to unravel facts difficulties which are past the aptitude of a spreadsheet. Python is a straightforward to exploit and simple to benefit programming language that's freely on hand on Macintosh, home windows, or Linux pcs. So when you study Python you should use it for the remainder of your profession without having to buy any software program. This ebook makes use of the Python three language. the sooner Python 2 model of this ebook is titled «Python for Informatics: Exploring Information». There are loose downloadable digital copies of this booklet in a number of codecs and helping fabrics for the ebook at www.pythonlearn.com. The direction fabrics can be found to you less than an inventive Commons License so that you can adapt them to educate your personal Python direction.

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In Python, the modulus operator is a percent sign (%). The syntax is the same as for other operators: >>> quotient = 7 // 3 >>> print(quotient) 2 >>> remainder = 7 % 3 >>> print(remainder) 1So 7 divided by 3 is 2 with 1 left over. The modulus operator turns out to be surprisingly useful. For example, you can check whether one number is divisible by another: if x % y is zero, then x is divisible by y. You can also extract the right-most digit or digits from a number. For example, x % 10 yields the right-most digit of x (in base 10).

Lets say you are doing Social Computing research on Facebook posts and you are interested in the most frequently used word in a series of posts. You could print out the stream of Facebook posts and pore over the text looking for the most common word, but that would take a long time and be very mistake prone. You would be smart to write a Python program to handle the task quickly and accurately so you can spend the weekend doing something fun. For example, look at the following text about a clown and a car.

If you give a variable an illegal name, you get a syntax error: >>> 76trombones = 9big parade9 SyntaxError: invalid syntax >>> more@ = 1000000 SyntaxError: invalid syntax >>> class = 9Advanced Theoretical Zymurgy9 SyntaxError: invalid syntax76trombones is illegal because it begins with a number. more@ is illegal because it contains an illegal character, @. But what's wrong with class? It turns out that class is one of Python's keywords. The interpreter uses keywords to recognize the structure of the program, and they cannot be used as variable names.

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