今さら言語処理100本ノック #01

>>> "stressed"[::-1]
'desserts'

>>> "パタトクカシーー"[1::2]
'タクシー'

>>> "".join([i + j for i, j in zip("パトカー", "タクシー")])
'パタトクカシーー'

>>> import re
>>> s = "Now I need a drink, alcoholic of course, after the heavy lectures involving quantum mechanics."
>>> list(map(lambda x: len(x), re.findall("[a-zA-Z]+", s)))
[3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5, 8, 9, 7, 9]

>>> import re
>>> s = "Hi He Lied Because Boron Could Not Oxidize Fluorine. New Nations Might Also Sign Peace Security Clause. Arthur King Can."
>>> p = (1, 5, 6, 7, 8, 9, 15, 16, 19)
>>> {word[0] if i in p else word[:2] :i for i, word in enumerate(re.findall("[a-zA-Z]+", s), start=1)}
{'H': 1, 'He': 2, 'Li': 3, 'Be': 4, 'B': 5, 'C': 6, 'N': 7, 'O': 8, 'F': 9, 'Ne': 10, 'Na': 11, 'Mi': 12, 'Al': 13, 'Si': 14, 'P': 15, 'S': 16, 'Cl': 17, 'Ar': 18, 'K': 19, 'Ca': 20}

>>> import re
>>> s = "I am an NLPer"
>>> n_gram = lambda x, y: [ "".join(x[i:i+y]) for i in range(len(x) - y + 1) ]
>>>
>>> n_gram(re.findall("[a-zA-Z]", s), 1)
['I', 'a', 'm', 'a', 'n', 'N', 'L', 'P', 'e', 'r']
>>> n_gram(re.findall("[a-zA-Z]", s), 2)
['Ia', 'am', 'ma', 'an', 'nN', 'NL', 'LP', 'Pe', 'er']
>>> n_gram(re.findall("[a-zA-Z]", s), 3)
['Iam', 'ama', 'man', 'anN', 'nNL', 'NLP', 'LPe', 'Per']
>>>
>>> n_gram(re.findall("[a-zA-Z]+", s), 1)
['I', 'am', 'an', 'NLPer']
>>> n_gram(re.findall("[a-zA-Z]+", s), 2)
['Iam', 'aman', 'anNLPer']
>>> n_gram(re.findall("[a-zA-Z]+", s), 3)
['Iaman', 'amanNLPer']

>>> bi_gram = lambda x: [ x[i:i+2] for i in range(len(x) - 1)]
>>> X = bi_gram("paraparaparadise")
>>> Y = bi_gram("paragraph")
>>> X
['pa', 'ar', 'ra', 'ap', 'pa', 'ar', 'ra', 'ap', 'pa', 'ar', 'ra', 'ad', 'di', 'is', 'se']
>>> Y
['pa', 'ar', 'ra', 'ag', 'gr', 'ra', 'ap', 'ph']
>>>
>>> set(X) | set(Y)
{'se', 'ra', 'ag', 'ad', 'ph', 'ap', 'is', 'pa', 'di', 'ar', 'gr'}
>>> set(X) & set(Y)
{'ar', 'pa', 'ra', 'ap'}
>>> set(X) - set(Y)
{'se', 'ad', 'is', 'di'}
>>>
>>> "se" in X
True
>>> "se" in Y
False

>>> f = lambda x, y, z: print(f"{x} 時の {y} は {z}")
>>> f(x=12, y="気温", z=22.4)
12 時の 気温 は 22.4

>>> import re
>>> cipher = lambda x: "".join([chr(219-ord(e)) if re.match("[a-z]", e) else e for e in x])
>>> cipher("abcde01Aaz")
'zyxwv01Aza'
>>>
>>> s = "".join([chr(i) for i in range(97, 97+26)])
>>> cipher(s)
'zyxwvutsrqponmlkjihgfedcba'
>>> cipher(cipher(s))
'abcdefghijklmnopqrstuvwxyz'
>>>
>>> s = "".join([chr(i) if i%3!=0 else chr(i).upper() for i in range(97, 97+26)])
>>> s
'abCdeFghIjkLmnOpqRstUvwXyz'
>>> cipher(s)
'zyCwvFtsIqpLnmOkjRhgUedXba'

>>> s = "I couldn’t believe that I could actually understand what I was reading : the phenomenal power of the human mind ."
>>> from random import sample
>>> f = lambda x: " ".join([e if len(e) < 5 else e[0] + "".join([e[i] for i in sample(range(1, len(e)-1), len(e)-2)]) + e[-1] for e in x.split()])
>>> f(s)
'I codln’ut bivleee that I cloud aaltculy usaertdnnd what I was randeig : the pnnmeoahel peowr of the hmuan mind .'
>>> f(s)
'I cl’duont belevie that I colud actaully udtsnaenrd what I was rieadng : the pmnehoeanl pewor of the huamn mind .'
>>> f(s)
'I coludn’t beevlie that I culod acltualy udestnnrad what I was rdeaing : the pnmoneehal power of the hmaun mind .'

>>> f2 = lambda x: " ".join([e if len(e) < 5 else e[0] + "".join(sample(e[1:-1], len(e[1:-1]))) + e[-1] for e in x.split()])
>>> f2(s)
'I cnudlo’t belivee that I colud aaulclty utnansredd what I was rediang : the pahemnneol peowr of the hamun mind .'
>>> f2(s)
'I culn’odt belivee that I culod acalulty uraetndnsd what I was reaindg : the pennoeamhl peowr of the haumn mind .'
>>> f2(s)
'I codlnu’t beevile that I cloud atluclay unrntsaedd what I was rneidag : the paeehnomnl peowr of the hmaun mind .'