如果我运行以下脚本，它将引发显示的错误。但是，如果我切换终端并运行相同的命令来删除文件（ <div class="menu__style">
<input type="radio"
name="colorize"
value="Default"
onclick="color_picker.unsetAlternateStyleSheet()"
class="menu__style__item"
id="style-default">
<label for="style-default"
class="menu__style__label">Default Style</label>
<br>
<input type="radio"
name="colorize"
value="AlternateStyleOne"
onclick="color_picker.setAlternateStyleSheet(title = this.value)"
class="menu__style__item"
id="style-one">
<label for="style-one"
class="menu__style__label">First Alternative Style</label>
<br>
<input type="radio"
name="colorize"
value="AlternateStyleTwo"
onclick="color_picker.setAlternateStyleSheet(title = this.value)"
class="menu__style__item"
id="style-two">
<label for="style-two"
class="menu__style__label">Second Alternative Style</label>
</div>
），则文件将被删除。
os.remove("test.db")文件“ c：\ Users \ You_A \ Desktop \ 2019Coding \ context_generator_decorator.py”，第32行，在 os.remove（文件） PermissionError：[WinError 32]该进程无法访问文件，因为该文件正在被另一个进程使用：'test.db'
再次在任何终端上运行import gc
import os
import time
from sqlite3 import connect
from contextlib import contextmanager
file = "test.db"
@contextmanager
def temptable(cur: object):
cur.execute("create table points(x, int, y int)")
try:
yield
finally:
cur.execute("drop table points")
with connect(file) as conn:
cur = conn.cursor()
with temptable(cur=cur):
cur.execute("insert into points (x, y) values(1, 1)")
cur.execute("insert into points (x, y) values(1, 2)")
cur.execute("insert into points (x, y) values(2, 1)")
for row in cur.execute("select x, y from points"):
print(row)
for row in cur.execute("select sum(x * y) from points"):
print(row)
os.remove(file)
都会成功删除文件。
答案 0 :(得分：1)
这可能是由于与数据库的连接未关闭引起的。尝试使用contextlib.closing()。修改后的代码如下：
import gc
import os
import time
from sqlite3 import connect
from contextlib import contextmanager, closing
file = "test.db"
@contextmanager
def temptable(cur: object):
cur.execute("create table points(x, int, y int)")
try:
yield
finally:
cur.execute("drop table points")
with closing(connect(file)) as conn:
# cur = closing(conn.cursor()) --> if auto-closing of cursor is desired
cur = conn.cursor() # if auto closing of cursor is not desired
with temptable(cur=cur):
cur.execute("insert into points (x, y) values(1, 1)")
cur.execute("insert into points (x, y) values(1, 2)")
cur.execute("insert into points (x, y) values(2, 1)")
for row in cur.execute("select x, y from points"):
print(row)
for row in cur.execute("select sum(x * y) from points"):
print(row)
os.remove(file)