In the above example, 7 divided by 3 is 2 when we use integer division and there is a remainder of 1 when we use the modulus operator. The modulus operator turns out to be surprisingly useful. Also, you can extract the right-most digit or digits from a number. Finally, returning to our time example, the remainder operator is extremely useful for doing conversions, say from seconds, to hours, minutes and seconds.
If we start with a number of seconds, say , the following program uses integer division and remainder to convert to an easier form. What are operators in python? Arithmetic operators Arithmetic operators are used to perform mathematical operations like addition, subtraction, multiplication, etc. Table of Contents What are operators in Python? Previous Tutorial:. Next Tutorial:.
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Learning any programming language will also teach you how to think like a programmer. All programming languages have their strengths and weaknesses. If you're looking for a language that works in a broad range of applications, or just want to dip your toe into the coding waters, Python may be good to try.
Python has a reputation for being easy to understand for new programmers. It can be used to write programs for computers or applications for the web. If you want to create the next big mobile app, however, Python is not a popular choice. A survey of Python users found that the most popular uses were for web development and data analysis.
Only about 6 percent of respondents used it for game development or app development. There are many commercial applications for Python programming, but the language has also caught hold in academic circles, especially among those working with large amounts of data. It's also useful for hobbyists. While he liked some aspects of ABC, he was frustrated by how hard it was to extend the language.
During his Christmas holiday break in , van Rossum decided to try creating his own language. He'd also been reading scripts for episodes of "Monty Python's Flying Circus," from the famous British comedy troupe. Looking for a name that was "short, unique and slightly mysterious," he chose to call it Python.
Do you have to be a fan of the show if you want to code Python? In the words of the Python Software Foundation , "No, but it helps. Although he considers himself retired now, van Rossum holds the title of Python's "benevolent dictator for life," a title he's held since In fact, since then a number of open-source creators — who get the final say on changes to their projects — have also been given that title by their development communities.
Python is open source, which means it's free to use and distribute, according to the official definition created by the Open Source Initiative. Built-ins are not keywords and thus, are susceptible to inadvertent use by new Python developers. Suppose you've got a module "binky. The fully qualified name of that foo function is "binky.
In this way, various Python modules can name their functions and variables whatever they want, and the variable names won't conflict — module1. In the Python vocabulary, we'd say that binky, module1, and module2 each have their own "namespaces," which as you can guess are variable name-to-object bindings.
For example, we have the standard "sys" module that contains some standard system facilities, like the argv list, and exit function. With the statement "import sys" you can then access the definitions in the sys module and make them available by their fully-qualified name, e. Yes, 'sys' has a namespace too! There is another import form that looks like this: "from sys import argv, exit". That makes argv and exit available by their short names; however, we recommend the original form with the fully-qualified names because it's a lot easier to determine where a function or attribute came from.
There are many modules and packages which are bundled with a standard installation of the Python interpreter, so you don't have to do anything extra to use them. These are collectively known as the "Python Standard Library. Inside the Python interpreter, the help function pulls up documentation strings for various modules, functions, and methods. These doc strings are similar to Java's javadoc. The dir function tells you what the attributes of an object are.
Below are some ways to call help and dir from the interpreter: help len — help string for the built-in len function; note that it's "len" not "len ", which is a call to the function, which we don't want help sys — help string for the sys module must do an import sys first dir sys — dir is like help but just gives a quick list of its defined symbols, or "attributes" help sys.
You can call help with that object itself or an example of that object, plus its attribute. For example, calling help 'xyz'. For details, see the Google Developers Site Policies. Google for Education. Python Exercises. Prelude Welcome to Google's Python online tutorial.
Language Introduction Python is a dynamic, interpreted bytecode-compiled language. Python source code Python source files use the ".
User-defined Functions Functions in Python are defined like this: Defines a "repeat" function that takes 2 arguments.
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