Python3.5 练习题

• 天天向上的力量

def dayup(df):  
    dayup = 1
    for i in range(365):
        if i % 7 in [6, 0]:
            dayup = dayup * (1 -0.01)
        else:
            dayup = dayup * (1 + df)
    return dayup
dayfactor = 0.01
while dayup(dayfactor) < 37.78:
    dayfactor +=0.001
print("工作日的努力参数是: {:.3f}".format(dayfactor))

• 动态进度条 

import time
scale = 50
print("执行开始".center(scale//2,"-"))  #25个字符 居中 -填充 //保留整数
start = time.perf_counter()
for i in range(scale + 1):
    a = "*" * i
    b = "." * (scale - i)
    c = (i/scale)*100
    dur = time.perf_counter() -start
    print("\r{:^3.0f}%[{}->{}]{:.2f}s".format(c,a,b,dur),end = '')
    time.sleep(0.1)
print("\n"+"执行结束".center(scale//2,"-"))

• 三次方格式化

  a = eval(input())
  b = pow(a, 3)
  print("{:-^20}".format(b))  

  # -是填充值 ^表示居中 20表示居中长度 

• 星号三角形

  N = eval(input())
  if N