Resolve "proper boolean conversion"

Closes #417 (closed)

mlair/helpers/helpers.py

@@ -4,6 +4,7 @@ __date__ = '2019-10-21'
 
 import inspect
 import math
+import argparse
 
 import numpy as np
 import xarray as xr
@@ -266,6 +267,20 @@ def filter_dict_by_value(dictionary: dict, filter_val: Any, filter_cond: bool) -
     return dict(filter(lambda x: (x[1] == filter_val) is filter_cond, dictionary.items()))
 
 
+def str2bool(v):
+    if isinstance(v, bool):
+        return v
+    elif isinstance(v, str):
+        if v.lower() in ('yes', 'true', 't', 'y', '1'):
+            return True
+        elif v.lower() in ('no', 'false', 'f', 'n', '0'):
+            return False
+        else:
+            raise argparse.ArgumentTypeError('Boolean value expected.')
+    else:
+        raise argparse.ArgumentTypeError('Boolean value expected.')
+
+
 # def convert_size(size_bytes):
 #     if size_bytes == 0:
 #         return "0B"