Display screen or portion thereof with a graphical user interface

[0001]FIG. 1 is a front perspective view of a handheld computing device with a display screen or portion thereof with a graphical user interface, and shows a first image according to a first embodiment of the new design;

[0002]FIG. 2 is a front view thereof and is a first image of a sequence; and,

[0003]FIG. 3 is a front view of a second image of the sequence thereof.

[0004]The design sequentially transitions between the images shown in FIGS. 2-3. The sequential transitions include changes in the location of elements displayed in the graphical user interface. The process or period in which one image transitions to another image forms no part of the claimed design.

[0005]Broken lines in FIGS. 1-3 show portions of a computing device with the display screen or portion thereof with a graphical user interface and form no part of the claimed design.