diff --git a/neurodsp/sim/params.py b/neurodsp/sim/params.py
index 9c955ee7..c46ebcfc 100644
--- a/neurodsp/sim/params.py
+++ b/neurodsp/sim/params.py
@@ -253,7 +253,7 @@ def _make_params(self, parameters=None, **kwargs):
             params = {**parameters, **kwargs}
 
         # If any base parameters were passed in, clear them
-        for bparam in self.base.keys():
+        for bparam in self.base:
             params.pop(bparam, None)
 
         return params
diff --git a/neurodsp/sim/update.py b/neurodsp/sim/update.py
index 5dd47199..c75db627 100644
--- a/neurodsp/sim/update.py
+++ b/neurodsp/sim/update.py
@@ -246,7 +246,7 @@ def param_sample_yielder(sim_params, samplers, n_samples=None):
         Simulation parameter definition.
     """
 
-    for ind in counter(n_samples):
+    for _ in counter(n_samples):
         out_params = deepcopy(sim_params)
         for updater, sampler in samplers.items():
             updater(out_params, next(sampler))
diff --git a/neurodsp/spectral/__init__.py b/neurodsp/spectral/__init__.py
index ef81e7cb..050c103a 100644
--- a/neurodsp/spectral/__init__.py
+++ b/neurodsp/spectral/__init__.py
@@ -1,6 +1,6 @@
 """Spectral module, for calculating power spectra, spectral variance, etc."""
 
-from .power import (compute_spectrum, compute_spectrum_welch, compute_spectrum_wavelet, 
+from .power import (compute_spectrum, compute_spectrum_welch, compute_spectrum_wavelet,
                     compute_spectrum_medfilt, compute_spectrum_multitaper)
 from .measures import compute_absolute_power, compute_relative_power, compute_band_ratio
 from .variance import compute_scv, compute_scv_rs, compute_spectral_hist