Fixes for issue "Fix the LGTM issues #1024" (#1034)

* 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()'

* Added Burrows-Wheeler transform algorithm.

* Added changes suggested by cclauss

* Fixes for issue 'Fix the LGTM issues #1024'.

* Added doctest for different parameter types and negative values.

* Fixed doctest issue added at last commit.

project_euler/problem_03/sol1.py

@@ -28,14 +28,38 @@ def isprime(no):
 
 def solution(n):
     """Returns the largest prime factor of a given number n.
-    
+
     >>> solution(13195)
     29
     >>> solution(10)
     5
     >>> solution(17)
     17
+    >>> solution(3.4)
+    3
+    >>> solution(0)
+    Traceback (most recent call last):
+        ...
+    ValueError: Parameter n must be greater or equal to one.
+    >>> solution(-17)
+    Traceback (most recent call last):
+        ...
+    ValueError: Parameter n must be greater or equal to one.
+    >>> solution([])
+    Traceback (most recent call last):
+        ...
+    TypeError: Parameter n must be int or passive of cast to int.
+    >>> solution("asd")
+    Traceback (most recent call last):
+        ...
+    TypeError: Parameter n must be int or passive of cast to int.
     """
+    try:
+        n = int(n)
+    except (TypeError, ValueError) as e:
+        raise TypeError("Parameter n must be int or passive of cast to int.")
+    if n <= 0:
+        raise ValueError("Parameter n must be greater or equal to one.")
     maxNumber = 0
     if isprime(n):
         return n
@@ -54,7 +78,6 @@ def solution(n):
                     elif isprime(i):
                         maxNumber = i
             return maxNumber
-    return int(sum)
 
 
 if __name__ == "__main__":

project_euler/problem_03/sol2.py

@@ -6,7 +6,6 @@ of a given number N?
 e.g. for 10, largest prime factor = 5. For 17, largest prime factor = 17.
 """
 from __future__ import print_function, division
-import math
 
 try:
     raw_input  # Python 2
@@ -16,14 +15,38 @@ except NameError:
 
 def solution(n):
     """Returns the largest prime factor of a given number n.
-    
+
     >>> solution(13195)
     29
     >>> solution(10)
     5
     >>> solution(17)
     17
+    >>> solution(3.4)
+    3
+    >>> solution(0)
+    Traceback (most recent call last):
+        ...
+    ValueError: Parameter n must be greater or equal to one.
+    >>> solution(-17)
+    Traceback (most recent call last):
+        ...
+    ValueError: Parameter n must be greater or equal to one.
+    >>> solution([])
+    Traceback (most recent call last):
+        ...
+    TypeError: Parameter n must be int or passive of cast to int.
+    >>> solution("asd")
+    Traceback (most recent call last):
+        ...
+    TypeError: Parameter n must be int or passive of cast to int.
     """
+    try:
+        n = int(n)
+    except (TypeError, ValueError) as e:
+        raise TypeError("Parameter n must be int or passive of cast to int.")
+    if n <= 0:
+        raise ValueError("Parameter n must be greater or equal to one.")
     prime = 1
     i = 2
     while i * i <= n: