Modified some docstrings | Removed global variables used only once in…

… config.py

src/config.py

@@ -6,8 +6,6 @@
 from yaml import safe_load
 
 CONFIG_FNAME: str = 'config.yaml'
-UTF_8: str = 'utf-8'
-MODE: str = 'rt'
 
 
 class Config:
@@ -19,7 +17,7 @@ class Config:
 
     def __init__(self, path: Optional[str] = CONFIG_FNAME):
         self.path: str = path
-        with open(self.path, mode=MODE, encoding=UTF_8) as stream:
+        with open(self.path, mode='rt', encoding='utf-8') as stream:
             self.yaml_config: dict = safe_load(stream)
 
     def get_dataset_url(self) -> str:

src/core/models/all_rainfall.py

@@ -1,6 +1,6 @@
 """
-Provides a costly to instantiate all-in-one class
-to manipulate rainfall data for every timeframes.
+Provides an all-in-one class to manipulate rainfall data for every timeframe.
+At a yearly, monthly and seasonal level.
 """
 
 from typing import Optional
@@ -22,7 +22,7 @@ class AllRainfall:
     - MonthlyRainfall data for all months
     - SeasonalRainfall data for all seasons
 
-    Costly to instantiate but contains all necessary data.
+    A bit costly to instantiate but contains all necessary data.
     """
 
     def __init__(self,

src/core/models/yearly_rainfall.py

@@ -49,7 +49,7 @@ def load_rainfall(self,
                       start_month: int,
                       end_month: Optional[int] = None) -> pd.DataFrame:
         """
-        Generic function to load Yearly Rainfall data into pandas DataFrame.
+        Generic function to load Yearly Rainfall data from raw data stored in pandas DataFrame.
 
         :param start_month: An integer representing the month
         to start getting our rainfall values (compulsory)