<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def is_value_in(constants_group, value):
 """ Checks whether value can be found in the given constants group, which in turn, should be a Django-like choices tuple. """

    for const_value, label in constants_group:
        if const_value == value:
            return True
    return False