作业4

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一

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))

 

 

二

#!/usr/bin/env python3
import time


class Index(object):
def __init__(self, number=50, decimal=2):
"""
:param decimal: 你保留的保留小数位
:param number: # 号的 个数
"""
self.decimal = decimal
self.number = number
self.a = 100/number # 在百分比 为几时增加一个 # 号

def __call__(self, now, total):
# 1. 获取当前的百分比数
percentage = self.percentage_number(now, total)

# 2. 根据 现在百分比计算
well_num = int(percentage / self.a)
# print("well_num: ", well_num, percentage)

# 3. 打印字符进度条
progress_bar_num = self.progress_bar(well_num)

# 4. 完成的进度条
result = "\r%s %s" % (progress_bar_num, percentage)
return result

def percentage_number(self, now, total):
"""
计算百分比
:param now: 现在的数
:param total: 总数
:return: 百分
"""
return round(now / total * 100, self.decimal)

def progress_bar(self, num):
"""
显示进度条位置
:param num: 拼接的 “#” 号的
:return: 返回的结果当前的进度条
"""
# 1. "#" 号个数
well_num = "#" * num

# 2. 空格的个数
space_num = " " * (self.number - num)

return '[%s%s]' % (well_num, space_num)



index = Index()

start = 371
for i in range(start + 1):
print(index(i, start), end='')
time.sleep(0.01)
# \r 返回本行开头
# end : python 结尾不加任何操作, 默认是空格

 三

算圆周率Pi具体公式：pi += 1/pow(16,k) * (4/(8*k+1) - 2/(8*k+4) - 1/(8*k+5) - 1/(8*k+6))

 

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