Programming_Assignment_23.py

1. **Is Symmetrical:**

```python
def is_symmetrical(num):
    # Convert the number to a string
    num_str = str(num)
    
    # Check if the string is the same as its reverse
    return num_str == num_str[::-1]
```

2. **Multiply Numbers:**

```python
def multiply_nums(num_str):
    # Split the string by ", " to get a list of numbers
    num_list = [int(num) for num in num_str.split(", ")]
    
    # Multiply the numbers in the list
    product = 1
    for num in num_list:
        product *= num
    
    return product
```

3. **Square Digits:**

```python
def square_digits(num):
    # Convert the number to a string
    num_str = str(num)
    
    # Square each digit and concatenate the results
    squared_digits = "".join(str(int(digit)**2) for digit in num_str)
    
    # Convert the result back to an integer
    return int(squared_digits)
```

4. **Setify:**

```python
def setify(lst):
    # Convert the list to a set to remove duplicates
    return list(set(lst))
```

5. **Mean:**

```python
def mean(num):
    # Convert the number to a string
    num_str = str(num)
    
    # Sum the digits and count the number of digits
    digit_sum = sum(int(digit) for digit in num_str)
    num_digits = len(num_str)
    
    # Calculate the mean
    return digit_sum // num_digits
```