Question: I have a .txt textfile with a list formatted like 
`[' ok ', ' test ', ' help ']`
How can I read/import this textfile list into a python list?

Answer: 
Always use the matTooltipClass and a custom class. Never use ::ng-deep directly on a material class and NEVER, NEVER set encapsulation: ViewEncapsulation.None. Angular components are made to be modular and have their own style. Both :ng-deep(or /deep/ or >>> or whatever they call it these days) and viewEncapsulation are going to override styles that you might want to keep contained in other components. I was fooled once by these, there is no easy work sometimes but these can cause you serious layout damage.
Angular Material tooltip exposes input property 'matTooltipClass'

So in the HTML

```
 ` 

        <mat-icon color="primary" matTooltip="test"
                    [matTooltipClass]="{ 'tool-tip': true }"
                    >help</mat-icon>

    `

```

In the CSS

```
   .tool-tip {
      color: white;
      background-color: red;

    }

```