human
finding a a value in list of tuples.
assistant
Here is a Python program for finding a value in a list of tuples

import collections

def find_in_list_of_tuples(list_of_tuples, value):
        """
        Finds a value in a list of tuples
        :param list_of_tuples: (list)
        :param value: (tuple)
        :return: (int)
        """
        for i in range(len(list_of_tuples)):
            if list_of_tuples[i] == value:
                return i
        return -1

# Enter the list
list1 = [(1, 2), (3, 4), (5, 6)]

# Enter the value
value = (7, 8)

# Calling the function
index = find_in_list_of_tuples(list1, value)

# Printing the index
print(index)

#Example Output
# -1

#Remember to inspect code for bugs.