python123_第三周练习_计算圆周率

代码：

pi = 0
N = 100
for k in range(N):
pi += 1/pow(16,k) * (4/(8*k+1) - 2/(8*k+4) - 1/(8*k+5) - 1/(8*k+6))
print("圆周率值是:{}".format(pi))
class Tiao(object):
def __init__(self):
self.obj1 = datetime.timedelta(seconds=1)
self.var = '%H:%M:%S'
def add(self, var):
a = datetime.datetime.strptime(var, self.var)
b = a + self.obj1
return str(b.strftime(self.var))
def str_time(self, var3):
a, b, c = [int(i) for i in var3.split(":")]
a *= 3600
b *= 60
return a + b + c
def yuan(self, var1, var2):
"""
计算 百分比
:param var1: 现在时间
:param var2: 总时间
"""
var1 = self.str_time(var1)
var2 = self.str_time(var2)
return '{:.2%}'.format(var1/var2)
def zhanshi(var):
a = Tiao()
b = "00:00:00"
while True:
if var == b:
break
b = a.add(b)
print('\r%s/%s (%s)' % (b, var, a.yuan(b, var)), end='')
time.sleep(1)
zhanshi("00:1:37")

 

结果如下：