Source code for complexity.utils

#!/usr/bin/env python
# -*- coding: utf-8 -*-


Helper functions used throughout Complexity.

import errno
import os
import sys

PY3 = sys.version > '3'
if PY3:
    import codecs
    input = raw_input

[docs]def make_sure_path_exists(path): """ Ensures that a directory exists. :param path: A directory path. """ try: os.makedirs(path) except OSError as exception: if exception.errno != errno.EEXIST: return False return True
[docs]def unicode_open(filename, *args, **kwargs): """ Opens a file as usual on Python 3, and with UTF-8 encoding on Python 2. :param filename: Name of file to open. """ if PY3: return open(filename, *args, **kwargs) kwargs['encoding'] = "utf-8" return, *args, **kwargs)
[docs]def query_yes_no(question, default="yes"): """ Ask a yes/no question via `raw_input()` and return their answer. :param question: A string that is presented to the user. :param default: The presumed answer if the user just hits <Enter>. It must be "yes" (the default), "no" or None (meaning an answer is required of the user). The "answer" return value is one of "yes" or "no". Adapted from """ valid = {"yes": True, "y": True, "ye": True, "no": False, "n": False} if default is None: prompt = " [y/n] " elif default == "yes": prompt = " [Y/n] " elif default == "no": prompt = " [y/N] " else: raise ValueError("invalid default answer: '%s'" % default) while True: sys.stdout.write(question + prompt) choice = input().lower() if default is not None and choice == '': return valid[default] elif choice in valid: return valid[choice] else: sys.stdout.write("Please respond with 'yes' or 'no' " "(or 'y' or 'n').\n")