有一个示例(Python)代码来检查目录是否已更改:
import os
def watch(path, fdict):
"""Checks a directory and children for changes"""
changed = []
for root, dirs, files in os.walk(path):
for f in files:
abspath = os.path.abspath(os.path.join(root, f))
new_mtime = os.stat(abspath).st_mtime
if not fdict.has_key(abspath) or new_mtime > fdict[abspath]:
changed.append(abspath)
fdict[abspath] = new_mtime
return fdict, changed
但是除非我添加至少 2 秒的睡眠,否则随附的单元测试会随机失败:
import unittest
import project_creator
import os
import time
class tests(unittest.TestCase):
def setUp(self):
os.makedirs('autotest')
f = open(os.path.join('autotest', 'new_file.txt'), 'w')
f.write('New file')
def tearDown(self):
os.unlink(os.path.join('autotest', 'new_file.txt'))
os.rmdir('autotest')
def test_amend_file(self):
changed = project_creator.watch('autotest', {})
time.sleep(2)
f = open(os.path.join('autotest', 'new_file.txt'), 'a')
f.write('\nA change!')
f.close()
changed = project_creator.watch('autotest', changed[0])
self.assertEqual(changed[1], [os.path.abspath(os.path.join('autotest', 'new_file.txt'))])
if __name__ == '__main__':
unittest.main()
stat 真的限制在 1 秒以下的准确度吗?(编辑:显然是这样,使用 FAT)是否有任何(跨平台)方法来检测更快速的变化?