  In this paper, for finite discrete field $F$, nonempty set $\Gamma$, weight
vector $\mathfrak{w}=({\mathfrak w}_\alpha)_{\alpha\in\Gamma}\in F^\Gamma$ and
weighted generalized shift $\sigma_{\varphi,{\mathfrak w}}:F^\Gamma\to
F^\Gamma$, we find necessary and sufficient conditions for uniform dynamical
system $(F^\Gamma,\sigma_{\varphi,{\mathfrak w}})$ to be Li--Yorke chaotic.
Next we find necessary and sufficient conditions for
$(F^\Gamma,\sigma_{\varphi,{\mathfrak w}})$ to be Devaney chaotic.
