修改以下代码使正确import random def proc(data): cls_no = random.choice(list(data.keys())) stu_no = random.randint(1,10) return "{}{:02}".format(cls_no, stu_no) if __name__ == "__main__": data = {"A001":32, "A002":47, "B001":39, "B002":42} result = set() while len(result) < 5: result.add(list[set()] ) print(result)
时间: 2024-03-09 17:45:38 浏览: 103
以下是修改后的代码:
```python
import random
def proc(data):
cls_no = random.choice(list(data.keys()))
stu_no = random.randint(1, data[cls_no])
return "{}{:02}".format(cls_no, stu_no)
if __name__ == "__main__":
data = {"A001":32, "A002":47, "B001":39, "B002":42}
result = set()
while len(result) < 5:
result.add(proc(data))
print(result)
```
主要修改如下:
1. 在第五行中,修改了 randint() 函数的第二个参数,使其取值范围为对应班级的学生人数,避免了随机生成不在学生人数范围内的学号。
2. 在第11行中,修改了调用的函数名称,将 list[set()] 改为 proc(data),这是修正后的函数名称。
相关问题
程序无法执行,修改class Processor(): def __init__(self): self._inspect_step = int(cfg.get('PROCESS', 'INSPECT_STEP')) def capture_img(self): global aco aco = aco + 1 self._cam.stream_on() raw_image = self._cam.data_stream[0].get_image() if raw_image is None: print("Getting image failed.\n") return None print("Frame ID: {} Height: {} Width: {} Count: {}\n" .format(raw_image.get_frame_id(), raw_image.get_height(), raw_image.get_width(), aco - 2)) numpy_image = raw_image.get_numpy_array() if numpy_image is None: return None img = Image.fromarray(numpy_image, 'L') if self._issave: picfile = '{}/{}.bmp'.format(self._picpath, self._piccount) self._piccount = self._piccount + 1 img.save(picfile) if self._isshow: w, h = img.size scale = min(1.0 * IMG_RESIZE_W / w, 1.0 * IMG_RESIZE_H / h) self._img = ImageTk.PhotoImage(image=img.resize((int(w * scale), int(h * scale)), Image.ANTIALIAS)) self._show_cb(self._img) self._cam.stream_off() return img def process_img(self, img): return PROC_OK def inspect(self): print("process2") time.sleep(1) def rotate(self): count = 0 aco = 0 self.threadsignal = 0 while self._running: v = self._dgl.qpin(ROT) if len(v) > 0: count = count + sum(v) if count > self._inspect_step: aco += 1 img = self.capture_img() count = count - self._inspect_step if __name__ == '__main__': task2 = multiprocessing.Process(target=self.inspect) task2.start() task1 = multiprocessing.Process(target=self.rotate) task1.start()
在这段代码中,有几个问题可以被改进。首先,类 `Processor` 中的全局变量 `aco` 可能会导致并发问题,在多进程环境下应该避免使用全局变量。其次,代码中出现了 `time.sleep()`,这会阻塞当前进程并造成性能瓶颈,应该尽量避免使用。
以下是可能的改进方案:
1. 将 `aco` 变量改为实例变量,避免多进程之间的并发问题。
2. 使用 `Queue` 或其他进程间通信机制替代全局变量,避免多进程之间的竞争。
3. 将 `time.sleep()` 改为使用定时器或者事件,避免阻塞进程并提高程序的性能。
4. 在多进程环境中,使用 `if __name__ == '__main__':` 来避免创建子进程时出现递归调用的问题。
以下是修改后的代码示例:
```python
import multiprocessing
from queue import Queue
import time
class Processor():
def __init__(self):
self._inspect_step = int(cfg.get('PROCESS', 'INSPECT_STEP'))
self._aco = 0
self._queue = Queue()
def capture_img(self):
self._aco += 1
self._cam.stream_on()
raw_image = self._cam.data_stream[0].get_image()
if raw_image is None:
print("Getting image failed.\n")
return None
print("Frame ID: {} Height: {} Width: {} Count: {}\n".format(raw_image.get_frame_id(), raw_image.get_height(), raw_image.get_width(), self._aco - 2))
numpy_image = raw_image.get_numpy_array()
if numpy_image is None:
return None
img = Image.fromarray(numpy_image, 'L')
if self._issave:
picfile = '{}/{}.bmp'.format(self._picpath, self._piccount)
self._piccount = self._piccount + 1
img.save(picfile)
if self._isshow:
w, h = img.size
scale = min(1.0 * IMG_RESIZE_W / w, 1.0 * IMG_RESIZE_H / h)
self._img = ImageTk.PhotoImage(image=img.resize((int(w * scale), int(h * scale)), Image.ANTIALIAS))
self._show_cb(self._img)
self._cam.stream_off()
return img
def process_img(self, img):
return PROC_OK
def inspect(self):
print("process2")
while self._running:
time.sleep(1)
self._queue.put("task")
def rotate(self):
count = 0
while self._running:
v = self._dgl.qpin(ROT)
if len(v) > 0:
count = count + sum(v)
if count > self._inspect_step:
self._aco += 1
img = self.capture_img()
count = count - self._inspect_step
try:
task = self._queue.get(block=False)
if task == "task":
print("processing task")
except:
pass
if __name__ == '__main__':
p = Processor()
p._running = True
task2 = multiprocessing.Process(target=p.inspect)
task2.start()
task1 = multiprocessing.Process(target=p.rotate)
task1.start()
```
请注意,这里只是对原始代码的一些修改建议,并不能保证这样的修改能够完全解决问题。在实际环境中,还需要根据具体情况进行调整和优化。
explain select count(0) from ( select distinct RES.ID_, RES.NAME_, ART.ASSIGNEE_, A0.TEXT_ as 'status', RES.START_TIME_, RES.END_TIME_, RES.BUSINESS_KEY_ from ACT_HI_PROCINST RES left outer join ACT_RE_PROCDEF DEF on RES.PROC_DEF_ID_ = DEF.ID_ inner join ACT_HI_VARINST A0 on RES.PROC_INST_ID_ = A0.PROC_INST_ID_ and a0.TASK_ID_ is null and A0.NAME_ = '@global_process_status' and A0.VAR_TYPE_ = 'integer' inner join ACT_HI_VARINST A1 on RES.PROC_INST_ID_ = A0.PROC_INST_ID_ and a0.TASK_ID_ is null and A1.NAME_ = '@process_form_structure' and A1.VAR_TYPE_ = 'string' left join ACT_RU_TASK ART on RES.ID_ = art.PROC_INST_ID_ where (exists ( select LINK.USER_ID_ from ACT_HI_IDENTITYLINK LINK where USER_ID_ in ("1") and LINK.PROC_INST_ID_ = RES.ID_))) table_count 怎么加索引生效
在这个查询中,需要对以下表的列添加索引:
- ACT_HI_PROCINST:ID_, START_TIME_, END_TIME_, PROC_DEF_ID_
- ACT_HI_VARINST:PROC_INST_ID_, NAME_, TASK_ID_, VAR_TYPE_
- ACT_RU_TASK:PROC_INST_ID_, ASSIGNEE_
你可以使用以下命令添加索引:
```sql
CREATE INDEX idx_act_hi_procinst_id ON ACT_HI_PROCINST (ID_);
CREATE INDEX idx_act_hi_procinst_start_time ON ACT_HI_PROCINST (START_TIME_);
CREATE INDEX idx_act_hi_procinst_end_time ON ACT_HI_PROCINST (END_TIME_);
CREATE INDEX idx_act_hi_procinst_proc_def_id ON ACT_HI_PROCINST (PROC_DEF_ID_);
CREATE INDEX idx_act_hi_varinst_proc_inst_id ON ACT_HI_VARINST (PROC_INST_ID_);
CREATE INDEX idx_act_hi_varinst_name ON ACT_HI_VARINST (NAME_);
CREATE INDEX idx_act_hi_varinst_task_id ON ACT_HI_VARINST (TASK_ID_);
CREATE INDEX idx_act_hi_varinst_var_type ON ACT_HI_VARINST (VAR_TYPE_);
CREATE INDEX idx_act_ru_task_proc_inst_id ON ACT_RU_TASK (PROC_INST_ID_);
CREATE INDEX idx_act_ru_task_assignee ON ACT_RU_TASK (ASSIGNEE_);
```
注意,添加索引可能会影响数据库的性能和空间消耗,因此需要根据具体情况进行权衡和测试。
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