diff --git a/jobs/desktop-mobile-mau-2020/desktop_mau/desktop_mau_dau.py b/jobs/desktop-mobile-mau-2020/desktop_mau/desktop_mau_dau.py
index 0438a3cf..ff018b33 100644
--- a/jobs/desktop-mobile-mau-2020/desktop_mau/desktop_mau_dau.py
+++ b/jobs/desktop-mobile-mau-2020/desktop_mau/desktop_mau_dau.py
@@ -27,10 +27,10 @@
 DESKTOP_QUERY = (ROOT_DIR / "mau_dau.sql").read_text()
 
 DESKTOP_USER_STATE_QUERY = """
-SELECT 
+SELECT
     *
-FROM 
-    `moz-fx-data-derived-datasets.analysis.xluo_kpi_plot_country_new_or_rescurrected_dau` 
+FROM
+    `moz-fx-data-derived-datasets.analysis.xluo_kpi_plot_country_new_or_rescurrected_dau`
 """
 
 
@@ -454,7 +454,8 @@ def plot_dau_mau_ratio(desktop_data):
         fontdict={"fontsize": 18, "color": "black"},
     )
 
-    # axs[1].plot.area([ind_dat["country_x"].isin(country_list)]["date", "country_x", "pcnt"], subplots=True)
+    # axs[1].plot.area([ind_dat["country_x"]\
+    # .isin(country_list)]["date", "country_x", "pcnt"], subplots=True)
     dat2 = ind_dat[ind_dat["country_x"].isin(country_list)][
         ["date", "country_x", "pcnt_MAU"]
     ].pivot(index="date", columns="country_x", values="pcnt_MAU")
diff --git a/jobs/desktop-mobile-mau-2020/mobile_mau/mobile_mau.py b/jobs/desktop-mobile-mau-2020/mobile_mau/mobile_mau.py
index 9e67c4be..b5bb3aa6 100644
--- a/jobs/desktop-mobile-mau-2020/mobile_mau/mobile_mau.py
+++ b/jobs/desktop-mobile-mau-2020/mobile_mau/mobile_mau.py
@@ -57,7 +57,7 @@ def create_table(template, platform, actual, forecast):
         - 1
     )
 
-    data_end_date = actual["date"].max().date()
+    # data_end_date = actual["date"].max().date()
 
     return template.render(
         platform=platform,
@@ -84,7 +84,8 @@ def create_table(template, platform, actual, forecast):
 
 def create_plot(platform, y_min, y_max, actuals, forecast, plot_start_date, slice_name):
     """
-    Display a plot given a platform (each mobile product), data for actuals and forecast, and slice (Global or Tier 1).
+    Display a plot given a platform (each mobile product),
+    data for actuals and forecast, and slice (Global or Tier 1).
     """
     main_metric_color = "#CA3524"
     main_metric_color_ci = "#DDDDDD"
@@ -185,11 +186,13 @@ def create_plot(platform, y_min, y_max, actuals, forecast, plot_start_date, slic
         # autosize=force_width is None,
         # width=force_width,
         # height=force_height,
-        title='<b>{} {} MAU</b> <span style="font-size: medium;">at end of day {}</span>'.format(
+        title="""\
+        <b>{} {} MAU</b> <span style="font-size: medium;">at end of day {}</span>\
+        """.format(
             slice_name,
             platform,
             data_end_date,
-        ),
+        ).strip(),
         titlefont={
             "size": 24,
         },
diff --git a/jobs/desktop-mobile-mau-2020/requirements.txt b/jobs/desktop-mobile-mau-2020/requirements.txt
index 25e66444..dff560a2 100644
--- a/jobs/desktop-mobile-mau-2020/requirements.txt
+++ b/jobs/desktop-mobile-mau-2020/requirements.txt
@@ -3,6 +3,7 @@ google-cloud-bigquery==1.27.2
 google-cloud-bigquery-storage==1.0.0
 google-cloud-storage==1.31.0
 Jinja2==2.11.3
+flake8==3.8.4
 matplotlib==3.3.2
 numpy==1.19.2
 pandas==1.1.2