Switch to 3pp Python.
Switch to 3pp Python.

Change-Id: I180129cfc38384bb9418a7604eb4fb86a3c721af

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed