Update LICENSE

Migrate to Python 3

LICENSE

@@ -1,21 +1,24 @@
-MIT License
+This is free and unencumbered software released into the public domain.
 
-Copyright (c) 2019 Rob Heaton
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
 
-Permission is hereby granted, free of charge, to any person obtaining a copy
+In jurisdictions that recognize copyright laws, the author or authors
-of this software and associated documentation files (the "Software"), to deal
+of this software dedicate any and all copyright interest in the
-in the Software without restriction, including without limitation the rights
+software to the public domain. We make this dedication for the benefit
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+of the public at large and to the detriment of our heirs and
-copies of the Software, and to permit persons to whom the Software is
+successors. We intend this dedication to be an overt act of
-furnished to do so, subject to the following conditions:
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
 
-The above copyright notice and this permission notice shall be included in all
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-copies or substantial portions of the Software.
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+For more information, please refer to <https://unlicense.org>
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.

README.md

@@ -1,12 +1,10 @@
 # Wavefunction Collapse
 
-This is the example code for my blog post,
+This is the example code for my blog post, ["The Wavefunction Collapse Algorithm explained very clearly"](https://robertheaton.com/2018/12/17/wavefunction-collapse-algorithm/). To install dependencies:
-"The Wavefunction Collapse Algorithm explained
-very clearly". To install dependencies:
 
 ```
 virtualenv vendor
-source vendor/bin/active
+source vendor/bin/activate
 pip install -r requirements.txt
 ```
 

main.py

@@ -143,13 +143,13 @@ class Wavefunction(object):
         """
         x, y = co_ords
         opts = self.coefficients[x][y]
-        valid_weights = {tile: weight for tile, weight in self.weights.iteritems() if tile in opts}
+        valid_weights = {tile: weight for tile, weight in self.weights.items() if tile in opts}
 
         total_weights = sum(valid_weights.values())
         rnd = random.random() * total_weights
 
         chosen = None
-        for tile, weight in valid_weights.iteritems():
+        for tile, weight in valid_weights.items():
             rnd -= weight
             if rnd < 0:
                 chosen = tile
@@ -272,7 +272,7 @@ def render_colors(matrix, colors):
             color = colors[val]
             output_row.append(color + val + colorama.Style.RESET_ALL)
 
-        print "".join(output_row)
+        print("".join(output_row))
 
 
 def valid_dirs(cur_co_ord, matrix_size):