Error on installation on Raspberry Pi

I tried installing this using:

pip install schedule

but get this error:

```
File "/tmp/pip-build-SWC7Qi/schedule/schedule/__init__.py", line 85
def __init__(self) -> None:
^
SyntaxError: invalid syntax
```

then i tried using:

pip3 install schedule

no the error on line 85 has gone but I get this:

```
File "/tmp/pip-build-aqb1bhwu/schedule/schedule/__init__.py", line 86
self.jobs: List[Job] = []
^
SyntaxError: invalid syntax
```

any help would be appreciated