Plotting wind barbs in python (no U,V component)
I can answer this in two steps


Calculate $u$ and $v$. This site has formulas for $u$ and $v$. They are as follows: $$u=-|\vec{v}|\sin(\frac{\pi}{180}\phi)$$ and $$v=-|\vec{v}|\cos(\frac{\pi}{180}\phi)$$
where $\phi$ is the wind direction in the meteorological system, and $|\vec{v}|$ is the wind speed.
Having calculated $u$ and $v$, you can plot the wind barbs by following the example found at this site.