added Selection Sort, Bubble Sort and Factorial to python Algoritm

python/bubble_sort.py

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+'''
+Bubble Sort Algorithm
+
+https://en.wikipedia.org/wiki/Bubble_sort
+'''
+
+def bubble_sort(arr):
+	length = len(arr)
+
+	for i in range(length):
+		for j in range(1,length-i):
+			if arr[j-1] > arr[j]:
+				arr[j-1], arr[j] = arr[j], arr[j-1]
+
+
+if __name__ == '__main__':
+	arr = [5, 10, 2, 0, 78, -2]
+	bubble_sort(arr)
+	print(arr)
+
+'''
+output: [-2, 0, 2, 5, 10, 78]
+'''

python/factorial.py

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+'''
+Program to calculate factorial of given number
+
+>>>factorial(1)
+1
+
+>>>factorial(10)
+3628800
+
+'''
+def factorial(num):
+	if num < 0:
+		print("Enter positive number")
+	elif num == 0:
+		return 1
+	else:
+		ans = 1
+		for i in range(1, num+1):
+			ans *= i
+
+	return ans
+
+if __name__ == '__main__':
+	num = int(input())
+	print(factorial(num))

python/selection_sort.py

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+'''
+Selection sort algorithm implimented in Python
+for more info on selection sort visit:
+https://en.wikipedia.org/wiki/Selection_sort
+'''
+
+def selection_sort(arr):
+	for i in range(len(arr)):
+		minimum = i
+
+		for j in range(i+1, len(arr)):
+			if arr[j] < arr[minimum]:
+				minimum = j;
+
+		if minimum != i:
+			arr[i], arr[minimum] = arr[minimum], arr[i]
+
+if __name__ == '__main__':
+	arr = [5, 10, 2, 0, 78, -2]
+	selection_sort(arr)
+	print(arr)
+
+'''
+output: [-2, 0, 2, 5, 10, 78]
+'''