06. 集合¶
"paraparaparadise"と"paragraph"に含まれる文字bi-gramの集合を，それぞれ, XとYとして求め，XとYの和集合，積集合，差集合を求めよ．さらに，'se'というbi-gramがXおよびYに含まれるかどうかを調べよ．
def n_gram(s,n):
sentence = s.split()
result = []
len_sentence = len(sentence)
for start in range(len_sentence - n + 1):
result.append(sentence[start:start+n])
return result
X = n_gram(" ".join([s for s in "paraparaparadise"]),2)
X = [s[0]+s[1] for s in X]
Y = n_gram(" ".join([s for s in "paragraph"]),2)
Y = [s[0]+s[1] for s in Y]
SX = set(X)
SY = set(Y)
#union
print(SX.union(SY))
#intersection
print(SX.intersection(SY))
#diff
print(SX.difference(SY))
#'se' in SX or SY
print('se' in SX)
print('se' in SY)
<結果>
{'pa', 'se', 'ra', 'di', 'ph', 'ag', 'is', 'gr', 'ar', 'ad', 'ap'}
{'pa', 'ar', 'ra', 'ap'}
{'se', 'ad', 'is', 'di'}
True
False
