diff --git a/docs/sphinx/source/whatsnew/v0.9.4.rst b/docs/sphinx/source/whatsnew/v0.9.4.rst
index ea89248743..c95502bae1 100644
--- a/docs/sphinx/source/whatsnew/v0.9.4.rst
+++ b/docs/sphinx/source/whatsnew/v0.9.4.rst
@@ -9,12 +9,13 @@ Deprecations
 
 Enhancements
 ~~~~~~~~~~~~
-
+* Multiple code style issues fixed that were reported by LGTM analysis. (:issue:`1275`, :pull:`1559`)
 
 Bug fixes
 ~~~~~~~~~
 
 
+
 Testing
 ~~~~~~~
 
@@ -33,3 +34,4 @@ Requirements
 
 Contributors
 ~~~~~~~~~~~~
+* Christian Orner (:ghuser:`chrisorner`)
\ No newline at end of file
diff --git a/pvlib/forecast.py b/pvlib/forecast.py
index ce80e0ad74..b077024b28 100644
--- a/pvlib/forecast.py
+++ b/pvlib/forecast.py
@@ -10,7 +10,6 @@
 
 from pvlib.location import Location
 from pvlib.irradiance import campbell_norman, get_extra_radiation, disc
-from pvlib.irradiance import _liujordan
 from siphon.catalog import TDSCatalog
 from siphon.ncss import NCSS
 
diff --git a/pvlib/iam.py b/pvlib/iam.py
index dfb2729906..a8592f4036 100644
--- a/pvlib/iam.py
+++ b/pvlib/iam.py
@@ -353,6 +353,7 @@ def martin_ruiz_diffuse(surface_tilt, a_r=0.16, c1=0.4244, c2=None):
     # avoid undefined results for horizontal or upside-down surfaces
     zeroang = 1e-06
 
+
     surface_tilt = np.where(surface_tilt == 0, zeroang, surface_tilt)
     surface_tilt = np.where(surface_tilt == 180, 180 - zeroang, surface_tilt)
 
@@ -361,8 +362,9 @@ def martin_ruiz_diffuse(surface_tilt, a_r=0.16, c1=0.4244, c2=None):
         c2 = 0.5 * a_r - 0.154
 
     beta = np.radians(surface_tilt)
-
-    from numpy import pi, sin, cos, exp
+    sin = np.sin
+    pi = np.pi
+    cos = np.cos
 
     # avoid RuntimeWarnings for <, sin, and cos with nan
     with np.errstate(invalid='ignore'):
@@ -372,8 +374,8 @@ def martin_ruiz_diffuse(surface_tilt, a_r=0.16, c1=0.4244, c2=None):
         trig_term_sky = sin_beta + (pi - beta - sin_beta) / (1 + cos(beta))
         trig_term_gnd = sin_beta +      (beta - sin_beta) / (1 - cos(beta))  # noqa: E222 E261 E501
 
-    iam_sky = 1 - exp(-(c1 + c2 * trig_term_sky) * trig_term_sky / a_r)
-    iam_gnd = 1 - exp(-(c1 + c2 * trig_term_gnd) * trig_term_gnd / a_r)
+    iam_sky = 1 - np.exp(-(c1 + c2 * trig_term_sky) * trig_term_sky / a_r)
+    iam_gnd = 1 - np.exp(-(c1 + c2 * trig_term_gnd) * trig_term_gnd / a_r)
 
     if out_index is not None:
         iam_sky = pd.Series(iam_sky, index=out_index, name='iam_sky')
diff --git a/pvlib/iotools/epw.py b/pvlib/iotools/epw.py
index df93e125c5..249dd76056 100644
--- a/pvlib/iotools/epw.py
+++ b/pvlib/iotools/epw.py
@@ -225,14 +225,15 @@ def read_epw(filename, coerce_year=None):
             'AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 '
             'Safari/537.36')})
         response = urlopen(request)
-        csvdata = io.StringIO(response.read().decode(errors='ignore'))
+        with io.StringIO(response.read().decode(errors='ignore')) as csvdata:
+            data, meta = parse_epw(csvdata, coerce_year)
+
     else:
         # Assume it's accessible via the file system
-        csvdata = open(str(filename), 'r')
-    try:
-        data, meta = parse_epw(csvdata, coerce_year)
-    finally:
-        csvdata.close()
+        with open(str(filename), 'r') as csvdata:
+            data, meta = parse_epw(csvdata, coerce_year)
+
+
     return data, meta
 
 
diff --git a/pvlib/location.py b/pvlib/location.py
index 0fb3b42a04..6e8e89ee00 100644
--- a/pvlib/location.py
+++ b/pvlib/location.py
@@ -6,7 +6,6 @@
 
 import os
 import datetime
-import warnings
 
 import pandas as pd
 import pytz
diff --git a/pvlib/temperature.py b/pvlib/temperature.py
index c55155606e..e52032f6ec 100644
--- a/pvlib/temperature.py
+++ b/pvlib/temperature.py
@@ -655,7 +655,6 @@ def fuentes(poa_global, temp_air, wind_speed, noct_installed, module_height=5,
 
     # iterate through timeseries inputs
     sun0 = 0
-    tmod0 = 293.15
 
     # n.b. the way Fuentes calculates the first timedelta makes it seem like
     # the value doesn't matter -- rather than recreate it here, just assume
diff --git a/setup.py b/setup.py
index 2abd339723..134ec1d88c 100755
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,6 @@
 #!/usr/bin/env python
 
 import os
-import sys
 
 try:
     from setuptools import setup, find_namespace_packages