start = time.time()什么意思
时间: 2024-05-30 21:11:16 浏览: 4
`time.time()` 是 Python 中的一个内置函数,用于获取当前系统时间的时间戳,即从 1970 年 1 月 1 日至今经过的秒数。而 `start = time.time()` 则表示将当前时间的时间戳赋值给变量 `start`。通常在代码中使用 `start = time.time()` 记录程序开始执行的时间,然后在程序结束时再使用 `end = time.time()` 记录程序结束执行的时间,通过计算 `end - start` 可以得到程序的运行时间。
相关问题
timestart = time.clock()
请注意,`time.clock()`在Python 3.8及以上版本已经被弃用。建议使用`time.perf_counter()`或`time.process_time()`代替。
`time.perf_counter()`返回一个具有高精度的性能计数器(以秒为单位),用于测量短时间间隔的时间。
`time.process_time()`返回进程执行CPU时间的累计值(以秒为单位),不包括睡眠时间和系统I/O等其他进程执行时间。
示例代码:
```python
import time
# 使用time.perf_counter()测量程序运行时间
start_time = time.perf_counter()
# 程序代码
end_time = time.perf_counter()
run_time = end_time - start_time
print(f"程序运行时间为:{run_time:.6f}秒")
# 使用time.process_time()测量程序执行CPU时间
start_cpu = time.process_time()
# 程序代码
end_cpu = time.process_time()
run_cpu = end_cpu - start_cpu
print(f"程序执行CPU时间为:{run_cpu:.6f}秒")
```
请注意,`time.perf_counter()`和`time.process_time()`返回的时间值的参考点可能因操作系统而异。在Windows系统上,它们的参考点是系统启动时刻;在Unix系统上,它们的参考点是1970年1月1日。
start = time.time() coco.main() stop = time.time()
As an AI language model, I don't have access to the specific code or context of your question. However, based on what you've provided, it seems like you're trying to measure the runtime of a function called "main" in a module called "coco". The code you've written would capture the start and stop time of the function execution, but you would need to subtract the start time from the stop time to get the actual runtime. Here's an example:
```
import time
import coco
start = time.time()
coco.main()
stop = time.time()
runtime = stop - start
print("Runtime: ", runtime)
```
This code imports the necessary modules, captures the start and stop time, and subtracts the start time from the stop time to get the runtime. The runtime is then printed to the console. Note that this assumes that the function call to "coco.main()" is the only thing being timed. If there are additional lines of code before or after this function call, the runtime will include those as well.
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