  We apply the Effective Field Theory of Large-Scale Structure to analyze the
$w$CDM cosmological model. By using the full shape of the power spectrum and
the BAO post-reconstruction measurements from BOSS, the Supernovae from
Pantheon, and a prior from BBN, we set the competitive CMB-independent limit
$w=-1.046_{-0.052}^{+0.055}$ at $68\%$ C.L.. After adding the Planck CMB data,
we find $w=-1.023_{-0.030}^{+0.033}$ at $68\%$ C.L.. Our results are obtained
using PyBird, a new, fast Python-based code which we make publicly available.
