尝试：
cmd = f'sysbench --test=cpu --cpu-max-prime={prime_numbers} --num-threads=2 run'
这称为f字符串，这是在Python> = 3.6中格式化字符串的简单方法。当然，您也可以只使用字符串连接或其他方法，这完全不是运行shell命令所特有的。
,使用import io.reactivex.schedulers.TestScheduler
val testScheduler = TestScheduler()
@Before
fun before() {
//you create your SearchImpl class here and use testScheduler to replace real schedulers inside it
}
@Test
fun loadItems_WhenDataIsAvailable() {
`when`(api.getFilms()).thenReturn(Observable.just(filmRequestFacke()))
searchImpl.getfilms(callback)
testScheduler.triggerActions() //Triggers any actions that have not yet been triggered and that are scheduled to be triggered at or before this Scheduler's present time.
verify(callback)?.onResponseSearchFilm(fackeFilms())
}
例如：
str.format完全不使用字符串格式。构建一个由命令名称和参数作为单独元素的 list ，以与subprocess.Popen（或其包装函数之一）一起使用。
prime_numbers = "20000"
cmd = [
'sysbench','--test=cpu','--cpu-max-prime',prime_numbers,'--num-threads=2','run'
]
with open("cpu_sysbench.txt","w") as f:
subprocess.run(cmd,stdout=f)
# or subprocess.call(cmd,stdout=f) in older Python 3.x
更新：要合并grep命令，请使用两个子进程，这些子进程的标准输入和标准输出结合在一起。
with open("cpu_sysbench.txt","w") as f:
p1 = subprocess.Popen(cmd,stdout=subprocess.PIPE)
# grep + cut can almost always be replaced by a single awk
subprocess.call(['awk','-F',':','/total time:/ { print $2 }'],stdin=p1.stdout,stdout=f)