Buffering point using PyQGIS?

How does Qgis calculate buffer?

Under the Processing Toolbox, search for the Buffer tool, double-click and add the roads layer as your Input Layer. Select a distance of 10 metres and keep the rest of the settings as they were. Click Run.
 

How do you draw a buffer around a point in Qgis?

It’s now time to create the buffers around the parks, setting a distance of 50 metres. To do this, select the “Parks” layer, go to the “Vector” section in the menu above, “Geoprocessing tools”, and then “Buffer(s)”. Make sure radio button to the left of “Buffer distance” is selected, and plug in 50 (for 50 metres).