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Python Program to Filter Rows with a specific Pair Sum
When it is required to filter rows with a specific pair sum, a method is defined. It checks to see if elements in a specific index is equal to key, and returns output based on this.
Below is a demonstration of the same −
Example
def find_sum_pair(val, key):
for index in range(len(val)):
for ix in range(index + 1, len(val)):
if val[index] + val[ix] == key:
return True
return False
my_list = [[71, 5, 21, 6], [34, 21, 2, 71], [21, 2, 34, 5], [6, 9, 21, 42]]
print("The list is :")
print(my_list)
my_key = 76
print("The key is ")
print(my_key)
my_result = [element for element in my_list if find_sum_pair(element, my_key)]
print("The resultant list is :")
print(my_result)Output
The list is : [[71, 5, 21, 6], [34, 21, 2, 71], [21, 2, 34, 5], [6, 9, 21, 42]] The key is 76 The resultant list is : [[71, 5, 21, 6]]
Explanation
A method named 'find_sum_pair' is defined that takes two parameters.
It iterates through the first parameter, and checks to see if elements in sum of values in two specific indices are equal to the second parameter.
If yes, the 'True' value is returned.
Otherwise, 'False' is returned.
Outside the method, a list of list is defined and is displayed on the console.
A value for key is defined.
The list comprehension is used to iterate over the list and the method is called by passing the required parameters.
This is assigned to a variable.
It is displayed as output on the console.
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