Moved more problems to Python.

python/e017.py

@@ -0,0 +1,71 @@
+def single_digit_integer_to_spoken_language(n):
+    if n == 0:
+        return ""
+    assert(n > 0 and n < 10)
+    return {1: 'one', 2: 'two', 3: 'three', 4: 'four', 5: 'five',
+            6: 'six', 7: 'seven', 8: 'eight', 9: 'nine'}[n]
+
+
+def double_digit_integer_to_spoken_language(n):
+    assert(n > 9 and n < 100)
+    try:
+        return {
+            10: 'ten', 11: 'eleven', 12: 'twelve', 13: 'thirteen',
+            14: 'fourteen', 15: 'fifteen', 16: 'sixteen',
+            17: 'seventeen', 18: 'eighteen', 19: 'nineteen'}[n]
+    except KeyError:
+        pass
+    a, b = str(n)
+    a = {2: 'twenty', 3: 'thirty', 4: 'forty', 5: 'fifty',
+         6: 'sixty', 7: 'seventy', 8: 'eighty', 9: 'ninety'}[int(a)]
+    b = integer_to_spoken_language(int(b))
+    return a + '-' + b
+
+
+def triple_digit_integer_to_spoken_language(n):
+    a, b = str(n)[0], str(n)[1:]
+    a = single_digit_integer_to_spoken_language(int(a))
+    b = integer_to_spoken_language(int(b))
+    if not b:
+        return a + " hundred"
+    return a + " hundred and " + b
+
+
+def four_digit_integer_to_spoken_language(n):
+    a, b = str(n)[0], str(n)[1:]
+    a = single_digit_integer_to_spoken_language(int(a))
+    b = integer_to_spoken_language(int(b))
+    return a + " thousand " + b
+
+
+def integer_to_spoken_language(n):
+    length = len(str(n))
+    if length == 1:
+        return single_digit_integer_to_spoken_language(n)
+    elif length == 2:
+        return double_digit_integer_to_spoken_language(n)
+    elif length == 3:
+        return triple_digit_integer_to_spoken_language(n)
+    elif length == 4:
+        return four_digit_integer_to_spoken_language(n)
+    else:
+        raise Exception("Length not supported.")
+
+
+assert(integer_to_spoken_language(5) == 'five')
+assert(integer_to_spoken_language(19) == 'nineteen')
+assert(integer_to_spoken_language(21) == 'twenty-one')
+assert(integer_to_spoken_language(210) == 'two hundred and ten')
+assert(integer_to_spoken_language(3000) == 'three thousand ')
+assert(integer_to_spoken_language(8333) ==
+       'eight thousand three hundred and thirty-three')
+
+
+def euler_017():
+    s = "".join([integer_to_spoken_language(i) for i in range(1, 1001)])
+    s = s.replace(" ", "").replace("-", "")
+    return len(s)
+
+
+assert(euler_017() == 21124)
+print("e017.py: {}".format(euler_017()))