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Versatile Python 3.x

TryPython

Python 3.8.0 (default, Nov 14 2019, 22:29:45) 
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> help
help> help
Welcome to Python 3.8's help utility!
If this is your first time using Python, you should definitely check out
the tutorial on the Internet at https://docs.python.org/3.8/tutorial/.
Enter the name of any module, keyword, or topic to get help on writing
Python programs and using Python modules.  To quit this help utility and
return to the interpreter, just type "quit".
To get a list of available modules, keywords, symbols, or topics, type
"modules", "keywords", "symbols", or "topics".  Each module also comes
with a one-line summary of what it does; to list the modules whose name
or summary contain a given string such as "spam", type "modules spam".
help> 

➜  ~ python3
Python 3.7.3 (default, Apr 24 2020, 18:51:23) 
[Clang 11.0.3 (clang-1103.0.32.62)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> print("Hello, Python 🐍")
Hello, Python 🐍
>>> print("Hello, Python 🐍");
Hello, Python 🐍
>>> 

control flow

https://docs.python.org/3/tutorial/controlflow.html

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

Compound Data Types

https://docs.python.org/3/tutorial/introduction.html#lists

# Python 3: List comprehensions
>>> fruits = ['Banana', 'Apple', 'Lime']
>>> loud_fruits = [fruit.upper() for fruit in fruits]
>>> print(loud_fruits)
['BANANA', 'APPLE', 'LIME']

# List and the enumerate function
>>> list(enumerate(fruits))
[(0, 'Banana'), (1, 'Apple'), (2, 'Lime')]

Intuitive Interpretation

http://docs.python.org/3/tutorial/introduction.html#using-python-as-a-calculator

# Python 3: Simple arithmetic
>>> 1 / 2
0.5
>>> 2 ** 3
8
>>> 17 / 3  # classic division returns a float
5.666666666666667
>>> 17 // 3  # floor division
5

Quick & Easy to Learn

https://docs.python.org/3/tutorial/

# Python 3: Simple output (with Unicode)
>>> print("Hello, I'm Python!")
Hello, I'm Python!

# Input, assignment
>>> name = input('What is your name?\n')
>>> print('Hi, %s.' % name)
What is your name?
Python
Hi, Python.

Functions Defined

https://docs.python.org/3/tutorial/controlflow.html#defining-functions

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

Python REPL

online console

https://www.python.org/shell/

https://www.pythonanywhere.com/

refs

https://www.python.org/

Python 3.8

https://docs.python.org/3.8/tutorial

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