It's a basic thing, but since it fits a little, I recorded it as a memorandum
If you need a temporary file when writing a test etc. tempfile Is recommended.
tempfile.mkstemp () creates a temporary file, but you have to delete the file yourself.
I thought I should do ʻos.remove () after the file operation, and as a result of writing and executing it, the PermissionError: [WinError 32] process cannot access the file. Another process is in use. :'C: \ ... [Temporary file path] `'error occurred.
As a result of trying various things while thinking that the with syntax is missing, it seems that the process at runtime still grabs the file, so I need to do ʻos.close ()`. did.
Below is an example of a test that worked well
class MyFileController():
def __init__(self, path):
self.path = path
def output(self, data):
with open(self.path, "a", newline='', encoding='utf_8_sig', errors='ignore') as f:
f.write(data)
class TestMyFileController(unittest.TestCase):
def test_output(self):
fd, path = tempfile.mkstemp()
mcc = MyFileController(path)
try:
mcc.output("test")
with open(path, encoding='utf_8_sig') as f:
test_data = f.read()
self.assertEqual(headers, "test")
finally:
os.close(fd) # <--Here.
os.remove(path)