Python MODIFIED Example.nlogo

extensions [ py ]

to setup ; Here we setup the connection to python and import a few libraries
  py:setup py:python
  py:run "import math"
  py:run "import sys"
  py:run "import os"
  reset-ticks
end

to go ; make sure everything is ready to go!
  py:run "print('go!')"
end

to get-sys-info ; Here we use the `sys` package in python to output some system info
  output-print (word "Python directory: " (py:runresult "sys.prefix"))
  output-print (word "Platform: " (py:runresult "sys.platform"))
  output-print (word "Python copyright: " (py:runresult "sys.copyright"))
  output-print ""
end

to gcd ; Use the `math` package's built-in gcd method to calculate the gcd(a,b)
  py:set "a" a
  py:set "b" b
  let result py:runresult "math.gcd(a, b)"
  output-print (word "Greatest common divisor of " a " and " b " is: " result)
  output-print ""
end

to get-home-directory ; Use the `os` package to get the home directory of the system
  let home-dir py:runresult "os.environ['HOME']"
  output-print (word "Current home directory is: " home-dir)
  output-print ""
end

to join-strings ; join some strings in python
  let result joined-strings
  output-print (word "Here they are joined: " result)
  output-print ""
end

to-report joined-strings ; helper procedure to join strings using a delimiter
  py:set "delim" delimiter
  py:set "list" read-from-string string-list
  report py:runresult "delim.join(list)"
end

to to-upper-case ; upper case some Strings in Python
  let result joined-strings
  py:set "result" result
  set result py:runresult "result.upper()"
  output-print (word "Here they are in upper case: " result)
  output-print ""
end

to test-big
  py:set "foo" range 100000
  let res py:runresult "foo"
  if length res != 100000 [
    error "failed"
  ]
end

; Public Domain:
; To the extent possible under law, Uri Wilensky has waived all
; copyright and related or neighboring rights to this model.
@#$#@#$#@
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@#$#@#$#@
## WHAT IS IT?

This model shows how to use NetLogo's `py` extension to interact with Python. This extension allows users with Python installed on their computer to write Python code in their NetLogo model and to share data back and forth between the Python and NetLogo.

## THINGS TO NOTICE

First, the model sets up Python with the `py:setup` and `py:python` primitives. The default `python` found on the system will be used. This step is required for models using the Python extension. If you do not have Python installed on your computer, you will need to install it on your computer outside of NetLogo. Once the Python environment is setup, it's available until the model is closed.

This model uses a few basic Python packages, `sys`, `math`, and `os`, to get information and do calculations that would be difficult or impossible in NetLogo. The packages are made available by using `py:run` to execute the Python `import` commands. The key to interacting with the packages is using `py:set` to set a variable value and pass data into the Python extension and `py:runresult` to get data back out of Python to use in NetLogo.

## THINGS TO TRY

Check out [the Python `math` package documentation](https://docs.python.org/3.6/library/math.html) and see if there are any other calculations it can do that NetLogo doesn't natively support and try to make them work.

## EXTENDING THE MODEL

While the uses demonstrated are convenient when needed, the real power of Python is in its scientific packages, like `numpy`, `pandas`, and `sklearn` and more.

## RELATED MODELS

There is a bundle of other Python extension demo models, `py-demo-models.zip`, available on [the Python extension site](https://github.com/NetLogo/Python-Extension/releases).

<!-- 2019 -->
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