Python限制for循环中的线程

Question

我试图将此循环限制为4个并发作业：

def testSSH(host, user, password, port):
s = pxssh.pxssh()
try:
    if not s.login (host, username=user, password=password, port=port):
        print(password)
        return False
    else:
        print(password)
        return True
except:
    print(password)
    return False




passes = "r", "1234", "12345", "123456!", "1234567", "a", "b", "e", "s", "A", "d", "66"

jobs = []
for passw in passes:
    thread = threading.Thread(target=testSSH, args=("localhost", "myuser", passw, "22",))
    jobs.append(thread)

for j in jobs:
        print(threading.active_count())
        j.start()

for j in jobs:
        j.join()

代码运行良好。然而，我似乎无法限制并发作业。 这个线程.活动\u计数（）始终是过程的值。 有什么建议吗？我试过this question，但没什么用 谢谢！你知道吗

Answer 1

好了，伙计们，我自己发现了一些东西：

threads = 0
def testSSH(host, user, password, port):
s = pxssh.pxssh()
try:
    if not s.login (host, username=user, password=password, port=port):
        print(password)
        return False
    else:
        print(password)
        return True
except:
    print(password)
    return False




passes = "r", "1234", "12345", "123456!", "1234567", "a", "b", "e", "s", "A", "d", "66"

jobs = []
for passw in passes:
    thread = threading.Thread(target=testSSH, args=("localhost", "myuser", passw, "22",))
    jobs.append(thread)

for j in jobs:
    threads = threading.active_count()
    while threads > 4:
    time.sleep(0.05)
    threads = threading.active_count()
        j.start()

for j in jobs:
        j.join()

希望这能帮助别人。。。你知道吗