Python/project_euler/problem_40/sol1.py

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# -.- coding: latin-1 -.-
"""
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Champernowne's constant
Problem 40
An irrational decimal fraction is created by concatenating the positive
integers:
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0.123456789101112131415161718192021...
It can be seen that the 12th digit of the fractional part is 1.
If dn represents the nth digit of the fractional part, find the value of the
following expression.
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d1 × d10 × d100 × d1000 × d10000 × d100000 × d1000000
"""
from __future__ import print_function
def solution():
"""Returns
>>> solution()
210
"""
constant = []
i = 1
while len(constant) < 1e6:
constant.append(str(i))
i += 1
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constant = "".join(constant)
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return (
int(constant[0])
* int(constant[9])
* int(constant[99])
* int(constant[999])
* int(constant[9999])
* int(constant[99999])
* int(constant[999999])
)
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if __name__ == "__main__":
print(solution())