To check whether a specified value is contained within a group of values, we can use the "in" keyword in Python. Here is an example program that takes a value and a list of values as input and checks whether the value is present in the list:
```
def check_value(value, values):
if value in values:
print(f"{value} is present in the list {values}")
else:
print(f"{value} is not present in the list {values}")
```
To test the program with the provided test data, we can call the function twice with different inputs:
```
check_value(3, [1, 5, 8, 3])
check_value(-1, [1, 5, 8, 3])
```
The output of the program will be:
```
3 is present in the list [1, 5, 8, 3]
-1 is not present in the list [1, 5, 8, 3]
```
This program checks whether a specified value is contained within a group of values and provides output accordingly. It is a simple and efficient way to check whether a value is present in a list in Python.
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