import threading
import random
import math
import time

def print_run_time(func):
    def wrapper(*args, **kw):
        begin_time = time.time()
        ret = func(*args, **kw)
        end_time = time.time()
        run_time = end_time - begin_time
        print('Run time',run_time)
        return ret
    return wrapper

@print_run_time
def run():
    sample_count = 10000000 #采样次数
    inner = 0 #落在圆内的点
    i = 0
    while i <sample_count:
        x_i = random.uniform(-1,1)
        y_i = random.uniform(-1,1)
        if (math.pow(x_i,2) + math.pow(y_i,2)) < 1:
            inner+=1
        i+=1
    pi = 4*(inner * 1.0)/sample_count
    print(pi)
    
@print_run_time
def single_run():
    print('single','='*20)
    for _ in range(5):
        run()
        
@print_run_time
def multi_run():
    print('multi','='*20)
    ts = []
    for i in range(5):
        ts.append(threading.Thread(target=run))
        ts[i].start()
    for i in range(5):
        ts[i].join()

if __name__ == '__main__':
    multi_run()
    single_run()