1、方法
（1）直接创建threading.Thread对象，并把调用对象作为参数传入；
（2）继承threading.Thread类，重写run()方法。
2、实例
import threading
import time
def catch_fish():
Pass
def one_thread():
start_time = time.time()
for i in range(1, 1001):
catch_fish()
end_time = time.time()
print("单线程测试 耗时 === %s" % str(end_time - start_time))
def muti_thread():
start_time = time.time()
for i in range(1, 1001):
threading.Thread(target=catch_fish()).start()
end_time = time.time()
print("多线程测试 耗时 === %s" % str(end_time - start_time))
if __name__ == '__main__':
# 单线程
threading.Thread(one_thread()).start()
# 多线程
muti_thread()
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