q13, q14, q15, q16 を解答

chap02/col1.txt

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+高知県
+埼玉県
+岐阜県
+山形県
+山梨県
+和歌山県
+静岡県
+山梨県
+埼玉県
+群馬県
+群馬県
+愛知県
+千葉県
+静岡県
+愛媛県
+山形県
+岐阜県
+群馬県
+千葉県
+埼玉県
+大阪府
+山梨県
+山形県
+愛知県

chap02/col2.txt

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+江川崎
+熊谷
+多治見
+山形
+甲府
+かつらぎ
+天竜
+勝沼
+越谷
+館林
+上里見
+愛西
+牛久
+佐久間
+宇和島
+酒田
+美濃
+前橋
+茂原
+鳩山
+豊中
+大月
+鶴岡
+名古屋

chap02/q13.py

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+# coding: utf-8
+
+with open("col1.txt", "r") as col1_f,\
+        open("col2.txt", "r") as col2_f,\
+        open("col12.txt", "w") as col12_f:
+    for col1, col2 in zip(col1_f, col2_f):
+        print(col1.rstrip(), col2.rstrip(), sep="\t", file=col12_f)
+# paste col1.txt col2.txt

chap02/q14.py

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+# coding:utf-8
+import sys
+
+args = sys.argv
+n = int(args[1])
+path = args[2]
+
+with open(path, "r") as fin:
+    for idx, line in enumerate(fin):
+        if n <= idx:
+            break
+        print(line, end="")
+# python q14.py 4 col1.txt
+# head -n 4 col1.txt

chap02/q15.py

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+# coding:utf-8
+
+import sys
+from collections import deque
+
+args = sys.argv
+n = int(args[1])
+path = args[2]
+
+with open(path, "r") as fin:
+    print(*deque(fin, n), sep="", end="")
+# python q15.py 4 col1.txt
+# tail -n 4 col1.txt

chap02/q16.py

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+# coding:utf-8
+
+import sys
+from itertools import islice
+
+
+def count_file_lines(f):
+    for i, line in enumerate(f):
+        pass
+    f.seek(0)
+    return i + 1
+
+
+def devide_num(dividend, divisor):
+    quotient = dividend // divisor
+    remainer = dividend % divisor
+    return (quotient + 1,) * remainer + (quotient,) * (divisor - remainer)
+
+
+if __name__ == '__main__':
+    args = sys.argv
+    n = int(args[1])
+    path = args[2]
+    with open(path, "r") as f:
+        total_line_num = count_file_lines(f)
+        l = devide_num(total_line_num, n)
+        for i, line_num in enumerate(l):
+            with open("{}.{}".format(path, i), "w") as fout:
+                for line in islice(f, line_num):
+                    print(line, end="", file=fout)
+
+# python q16.py 5 col1.txt
+# split -l 5 col1.txt