how to create my own exceptions in python code example

Example: buildin exceptions in python

BaseException
 ├── SystemExit                   # Raised by the sys.exit() function.
 ├── KeyboardInterrupt            # Raised when the user hits the interrupt key (ctrl-c).
 └── Exception                    # User-defined exceptions should be derived from this class.
      ├── ArithmeticError         # Base class for arithmetic errors.
      │    └── ZeroDivisionError  # Raised when dividing by zero.
      ├── AttributeError          # Raised when an attribute is missing.
      ├── EOFError                # Raised by input() when it hits end-of-file condition.
      ├── LookupError             # Raised when a look-up on a collection fails.
      │    ├── IndexError         # Raised when a sequence index is out of range.
      │    └── KeyError           # Raised when a dictionary key or set element is not found.
      ├── NameError               # Raised when a variable name is not found.
      ├── OSError                 # Errors such as “file not found” or “disk full” (see Open).
      │    └── FileNotFoundError  # When a file or directory is requested but doesn't exist.
      ├── RuntimeError            # Raised by errors that don't fall in other categories.
      │    └── RecursionError     # Raised when the maximum recursion depth is exceeded.
      ├── StopIteration           # Raised by next() when run on an empty iterator.
      ├── TypeError               # Raised when an argument is of wrong type.
      └── ValueError              # When an argument is of right type but inappropriate value.
           └── UnicodeError       # Raised when encoding/decoding strings to/from bytes fails.