+
+
+def first(seq, predicate, default=None):
+ """
+ Return the first item in sequence that satisfies the callable, predicate, or
+ returns the default if not found.
+
+ :param seq: iterable sequence of objects
+ :param predicate: callable that accepts one item from the sequence
+ :param default: value to return if not found (default is None)
+ :return: default value if no item satisfies the predicate
+ """
+ return next((i for i in seq if predicate(i)), default)
+
+
+def check(predicate, message):
+ """
+ Raise a RuntimeError with the provided message if predicate is False.
+
+ Example:
+ check(path.is_file(), "{} must be a file".format(path.as_posix()))
+
+ :param predicate: boolean condition
+ :param message: message
+ """
+ if not predicate:
+ raise RuntimeError(message)
+
+
+def unzip(zip_path, target_dir):
+ """
+ Extracts a Zip archive located at zip_path to target_dir (which will be
+ created if it already exists)
+
+ :param zip_path: path to valid zip file
+ :param target_dir: directory to unzip zip_path
+ """
+ check(zipfile.is_zipfile(zip_path), "{} is not a valid zipfile or does not exist".format(zip_path))
+ archive = zipfile.ZipFile(zip_path)
+ if not os.path.exists(target_dir):
+ os.makedirs(target_dir, exist_ok=True)
+ archive.extractall(path=target_dir)
+
+
+def remove(sequence, exclude, key=None):
+ """
+ Remove a copy of sequence that items occur in exclude.
+
+ :param sequence: sequence of objects
+ :param exclude: objects to excluded (must support ``in`` check)
+ :param key: optional function to extract key from item in sequence
+ :return: list of items not in the excluded
+ """
+ key_func = key if key else lambda x: x
+ result = (s for s in sequence if key_func(s) not in exclude)
+ return set(result) if isinstance(sequence, Set) else list(result)