fix isort compatibility

scripts/plot_summary.py

@@ -4,11 +4,11 @@ logger = logging.getLogger(__name__)
 import numpy as np
 import pandas as pd
 
+import matplotlib.gridspec as gridspec
 import matplotlib.pyplot as plt
 plt.style.use('ggplot')
 
 from prepare_sector_network import co2_emissions_year
-from helper import update_config_with_sector_opts
 
 #consolidate and rename
 def rename_techs(label):
@@ -373,7 +373,6 @@ def plot_carbon_budget_distribution(input_eurostat):
     Plot historical carbon emissions in the EU and decarbonization path
     """
 
-    import matplotlib.gridspec as gridspec
     import seaborn as sns; sns.set()
     sns.set_style('ticks')
     plt.style.use('seaborn-ticks')