Create README.md

pos_tagging/README.md

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+# POS Tagging
+
+## Python Code Snippet
+
+### Imports:
+
+```python
+from nltk.corpus import wordnet as wn
+
+nltk.download('wordnet')
+``
+
+### Function:
+
+```python
+def word_pos(word):
+  """Convert word to POS TAG if exists in WordNet.
+  Imports: 'from nltk.corpus import wordnet as wn'.
+  Download WordNet: 'nltk.download('wordnet')'
+  Pos Names: 'NOUN', 'VERB', 'ADJECTIVE', 'ADJECTIVE SATELITE', 'ADVERB'
+  Pos Tags: 'n', 'v', 'a', 's', 'r'
+
+  Note:
+      Regarding ADJECTIVE SATELITE:
+      Certain adjectives bind minimal meaning. e.g. "dry", "good", &tc. 
+      Each of these is the center of an adjective synset in WN.
+      Adjective satellites imposes additional commitments on top of the meaning
+      of the central adjective, e.g. "arid" = "dry" + a particular context 
+      (i.e. climates).
+  """
+  # from nltk.corpus import wordnet as wn
+  # nltk.download('wordnet')
+  # Certain adjectives bind minimal meaning. e.g. "dry", "good", &tc. Each of these is the center of an adjective synset in WN.
+  tag = wn.synsets(word)
+  if len(tag) > 0:
+    tag = tag[0].pos()
+    # https://wordnet.princeton.edu/documentation/wndb5wn
+    pos_decode = {'n':'NOUN', 'v':'VERB', 'a':'ADJECTIVE', 's':'ADJECTIVE SATELITE', 'r':'ADVERB'}
+    return pos_decode[tag]
+  else:
+    return None
+```