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# Python 3: Fibonacci series up to n\\r\\n>>> def fib(n):\\r\\n>>>     a, b = 0, 1\\r\\n>>>     while a < n:\\r\\n>>>         print(a, end=\\' \\')\\r\\n>>>         a, b = b, a+b\\r\\n>>>     print()\\r\\n>>> fib(1000)\\r\\n0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987

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Functions Defined

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The core of extensible programming is defining functions. Python allows mandatory and optional arguments, keyword arguments, and even arbitrary argument lists. More about defining functions in Python 3

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# Python 3: List comprehensions\\r\\n>>> fruits = [\\'Banana\\', \\'Apple\\', \\'Lime\\']\\r\\n>>> loud_fruits = [fruit.upper() for fruit in fruits]\\r\\n>>> print(loud_fruits)\\r\\n[\\'BANANA\\', \\'APPLE\\', \\'LIME\\']\\r\\n\\r\\n# List and the enumerate function\\r\\n>>> list(enumerate(fruits))\\r\\n[(0, \\'Banana\\'), (1, \\'Apple\\'), (2, \\'Lime\\')]

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Compound Data Types

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Lists (known as arrays in other languages) are one of the compound data types that Python understands. Lists can be indexed, sliced and manipulated with other built-in functions. More about lists in Python 3

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```
# Python 3: Simple arithmetic\\r\\n>>> 1 / 2\\r\\n0.5\\r\\n>>> 2 ** 3\\r\\n8\\r\\n>>> 17 / 3  # classic division returns a float\\r\\n5.666666666666667\\r\\n>>> 17 // 3  # floor division\\r\\n5
```
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Intuitive Interpretation
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Calculations are simple with Python, and expression syntax is straightforward: the operators +, -, * and / work as expected; parentheses () can be used for grouping. More about simple math functions in Python 3.
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# Python 3: Simple output (with Unicode)\\r\\n>>> print(\"Hello, I\\'m Python!\")\\r\\nHello, I\\'m Python!\\r\\n\\r\\n# Input, assignment\\r\\n>>> name = input(\\'What is your name?\\\\n\\')\\r\\n>>> print(\\'Hi, %s.\\' % name)\\r\\nWhat is your name?\\r\\nPython\\r\\nHi, Python.

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Quick & Easy to Learn

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Experienced programmers in any other language can pick up Python very quickly, and beginners find the clean syntax and indentation structure easy to learn. Whet your appetite with our Python 3 overview.

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# For loop on a list\\r\\n>>> numbers = [2, 4, 6, 8]\\r\\n>>> product = 1\\r\\n>>> for number in numbers:\\r\\n...    product = product * number\\r\\n... \\r\\n>>> print(\\'The product is:\\', product)\\r\\nThe product is: 384

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All the Flow You’d Expect

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Python knows the usual control flow statements that other languages speak — if, for, while and range — with some of its own twists, of course. More control flow tools in Python 3

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Python is a programming language that lets you work quickly and integrate systems more effectively. Learn More

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