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Copy pathutils.py
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86 lines (69 loc) · 2.34 KB
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# Copyright 2018 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Miscellaneous utilities"""
from contextlib import contextmanager
import functools
import itertools
import logging
import operator
import os
import re
import sys
import time
def dbg(*objects, file=sys.stderr, flush=True, **kwargs):
"Helper function to print to stderr and flush"
print(*objects, file=file, flush=flush, **kwargs)
def ensure_dir_exists(directory):
"Creates local directories if they don't exist."
if directory.startswith('gs://'):
return
if not os.path.exists(directory):
dbg("Making dir {}".format(directory))
os.makedirs(directory, exist_ok=True)
def parse_game_result(result):
"Parse an SGF result string into value target."
if re.match(r'[bB]\+', result):
return 1
if re.match(r'[wW]\+', result):
return -1
return 0
def product(iterable):
"Like sum(), but with multiplication."
return functools.reduce(operator.mul, iterable)
def _take_n(num_things, iterable):
return list(itertools.islice(iterable, num_things))
def iter_chunks(chunk_size, iterator):
"Yield from an iterator in chunks of chunk_size."
iterator = iter(iterator)
while True:
next_chunk = _take_n(chunk_size, iterator)
# If len(iterable) % chunk_size == 0, don't return an empty chunk.
if next_chunk:
yield next_chunk
else:
break
@contextmanager
def timer(message):
"Context manager for timing snippets of code."
tick = time.time()
yield
tock = time.time()
print("%s: %.3f seconds" % (message, (tock - tick)))
@contextmanager
def logged_timer(message):
"Context manager for timing snippets of code. Echos to logging module."
tick = time.time()
yield
tock = time.time()
logging.info("%s: %.3f seconds", message, (tock - tick))