MicroPython中怎么计算任意位数圆周率

本篇文章为大家展示了MicroPython中怎么计算任意位数圆周率，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

计算任意精度的圆周率是个有趣的主题，得益于python的强大计算能力，我们在MicroPython中也可以轻松的计算pi的数值。

先输入下面的代码：

"""文件：pi.py说明：用MicroPython计算任意精度圆周率计算作者：未知版本：时间：修改：邵子扬      2016.5      v1.1http://bbs.micro-python.com/forum.php"""import timedef pi(places=10):  # 3 + 3*(1/24) + 3*(1/24)*(9/80) + 3*(1/24)*(9/80)*(25/168)  # The numerators 1, 9, 25, ... are given by (2x + 1) ^ 2  # The denominators 24, 80, 168 are given by (16x^2 -24x + 8)  extra = 8  one = 10 ** (places+extra)  t, c, n, na, d, da = 3*one, 3*one, 1, 0, 0, 24  while t > 1:     n, na, d, da = n+na, na+8, d+da, da+32    t = t * n // d    c += t  return c // (10 ** extra)def pi_t(n=10):    t1=time.ticks_us()    t=pi(n)    t2=time.ticks_us()    print('elapsed: ', time.ticks_diff(t1,t2)/1000000, 's')    return tdef pi2(n=10):    r=6*(10**n)*1000    p=0    k=0    c=r//2    d=c//(2*k+1)    while d>0:        p=p+d        k=k+1        k2=2*k        c=c*(k2-1)//(4*k2)        d=c//(k2+1)    return p//1000def pi2_t(n=10):    t1=time.ticks_us()    t=pi2(n)    t2=time.ticks_us()    print('elapsed: ', time.ticks_diff(t1,t2)/1000000, 's')    return t

我们将它复制到STM32F7DISC中（STM32F7DISC已经下载了MicroPython固件），然后测试一下计算速度。（在其它MicroPython开发板上也可以进行这个测试）

MicroPython v1.8 on 2016-05-15; F7DISC with STM32F746
Type "help()" for more information.
>>> import pi
>>> npi=pi.pi_t(1000)
elapsed: 0.221486 s
>>> npi=pi.pi_t(2000)
elapsed: 0.793141 s
>>> npi=pi.pi_t(5000)
elapsed: 4.981964 s
>>> npi=pi.pi_t(10000)
elapsed: 21.02012 s
>>>

从运行结果可以看出，虽然不是很快，但是考虑到STM32的资源和性能，结果已经出乎预料了，毕竟计算函数还不到10行代码，没有做深度优化。最后打印出1000位的圆周率，大家可以和标准结果比较看看。

>>> pi.pi(1000)
31415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989
>>>

上述内容就是MicroPython中怎么计算任意位数圆周率，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注行业资讯频道。