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import sys
import os.path
import subprocess
from pathlib import Path
def datapath(path):
return os.path.join(os.path.dirname(__file__), "data", path)
def cutpath(path):
return os.path.join(os.path.dirname(__file__), "cut", path)
class FilesDifferent(Exception):
pass
def assert_files_equal(path1, path2, ignore_trailing_space: bool = False):
if not Path(path1).exists():
raise FileNotFoundError(path1)
if not Path(path2).exists():
raise FileNotFoundError(path2)
cmd = ["diff", "-u"]
if sys.platform == "win32":
cmd.append("--strip-trailing-cr")
if ignore_trailing_space:
if sys.platform == "darwin":
# Ignores too much, but macOS doesn’t have the option below
cmd.append("-b")
else:
cmd.append("--ignore-trailing-space")
if sys.platform == "win32":
path1, path2 = os.fspath(path1), os.fspath(path2)
try:
subprocess.check_output(cmd + [path1, path2], stderr=subprocess.STDOUT)
except subprocess.CalledProcessError as e:
raise FilesDifferent("\n" + e.output.decode()) from None
def binomial(n, k):
"""
Return binomial coefficient ('n choose k').
This implementation does not use factorials.
"""
k = min(k, n - k)
if k < 0:
return 0
r = 1
for j in range(k):
r *= n - j
r //= j + 1
return r
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