List

Python/Arrays/largestelementinarray.py

@@ -0,0 +1,25 @@
+# Python3 program to find maximum
+# in arr[] of size n
+
+# python function to find maximum
+# in arr[] of size n
+def largest(arr,n):
+
+	# Initialize maximum element
+	max = arr[0]
+
+	# Traverse array elements from second
+	# and compare every element with
+	# current max
+	for i in range(1, n):
+		if arr[i] > max:
+			max = arr[i]
+	return max
+
+# Driver Code
+arr = [10, 324, 45, 90, 9808]
+n = len(arr)
+Ans = largest(arr,n)
+print ("Largest in given array is",Ans)
+
+# This code is contributed by Smitha Dinesh Semwal

Python/Arrays/sumofarray.py

@@ -0,0 +1,32 @@
+# Python 3 code to find sum
+# of elements in given array
+def _sum(arr):
+
+	# initialize a variable
+	# to store the sum
+	# while iterating through
+	# the array later
+	sum=0
+
+	# iterate through the array
+	# and add each element to the sum variable
+	# one at a time
+	for i in arr:
+		sum = sum + i
+
+	return(sum)
+
+# driver function
+arr=[]
+# input values to list
+arr = [12, 3, 4, 15]
+
+# calculating length of array
+n = len(arr)
+
+ans = _sum(arr)
+
+# display sum
+print ('Sum of the array is ', ans)
+
+# This code is contributed by Himanshu Ranjan

Python/List/interchangefirstlastele.py

@@ -0,0 +1,18 @@
+# Python3 program to swap first
+# and last element of a list
+
+# Swap function
+def swapList(newList):
+	size = len(newList)
+
+	# Swapping
+	temp = newList[0]
+	newList[0] = newList[size - 1]
+	newList[size - 1] = temp
+
+	return newList
+
+# Driver code
+newList = [12, 35, 9, 56, 24]
+
+print(swapList(newList))

Python/List/swap2elements.py

@@ -0,0 +1,14 @@
+# Python3 program to swap elements
+# at given positions
+
+# Swap function
+def swapPositions(list, pos1, pos2):
+
+	list[pos1], list[pos2] = list[pos2], list[pos1]
+	return list
+
+# Driver function
+List = [23, 65, 19, 90]
+pos1, pos2 = 1, 3
+
+print(swapPositions(List, pos1-1, pos2-1))