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Added doctest and more explanation about Dijkstra execution. (#1014)

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* Added doctest and more explanation about Dijkstra execution.

* tests were not passing with python2 due to missing __init__.py file at number_theory folder

* Removed the dot at the beginning of the imported modules names because 'python3 -m doctest -v data_structures/hashing/*.py' and 'python3 -m doctest -v data_structures/stacks/*.py' were failing not finding hash_table.py and stack.py modules.

* Moved global code to main scope and added doctest for project euler problems 1 to 14.

* Added test case for negative input.

* Changed N variable to do not use end of line scape because in case there is a space after it the script will break making it much more error prone.

* Added problems description and doctests to the ones that were missing. Limited line length to 79 and executed python black over all scripts.

* Changed the way files are loaded to support pytest call.

* Added __init__.py to problems to make them modules and allow pytest execution.

* Added project_euler folder to test units execution

* Changed 'os.path.split(os.path.realpath(__file__))' to 'os.path.dirname()'
This commit is contained in:
Bruno Simas Hadlich
2019-07-16 20:09:53 -03:00
committed by cclauss
parent 2fb3beeaf1
commit 267b5eff40
100 changed files with 2621 additions and 1438 deletions
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69
project_euler/problem_28/sol1.py
View File

@ -1,29 +1,60 @@
from __future__ import print_function
"""
Starting with the number 1 and moving to the right in a clockwise direction a 5
by 5 spiral is formed as follows:
21 22 23 24 25
20 7 8 9 10
19 6 1 2 11
18 5 4 3 12
17 16 15 14 13
It can be verified that the sum of the numbers on the diagonals is 101.
What is the sum of the numbers on the diagonals in a 1001 by 1001 spiral formed
in the same way?
"""
from math import ceil
try:
xrange #Python 2
xrange # Python 2
except NameError:
xrange = range #Python 3
xrange = range # Python 3
def diagonal_sum(n):
total = 1
"""Returns the sum of the numbers on the diagonals in a n by n spiral
formed in the same way.
for i in xrange(1, int(ceil(n/2.0))):
odd = 2*i+1
even = 2*i
total = total + 4*odd**2 - 6*even
>>> diagonal_sum(1001)
669171001
>>> diagonal_sum(500)
82959497
>>> diagonal_sum(100)
651897
>>> diagonal_sum(50)
79697
>>> diagonal_sum(10)
537
"""
total = 1
return total
for i in xrange(1, int(ceil(n / 2.0))):
odd = 2 * i + 1
even = 2 * i
total = total + 4 * odd ** 2 - 6 * even
if __name__ == '__main__':
import sys
return total
if len(sys.argv) == 1:
print(diagonal_sum(1001))
else:
try:
n = int(sys.argv[1])
diagonal_sum(n)
except ValueError:
print('Invalid entry - please enter a number')
if __name__ == "__main__":
import sys
if len(sys.argv) == 1:
print(diagonal_sum(1001))
else:
try:
n = int(sys.argv[1])
print(diagonal_sum(n))
except ValueError:
print("Invalid entry - please enter a number")