人生苦短，我学Python-003：Python基本数据类型

-3.1 数字 类型及操作

-3.2 实例 3: 天向上的力量

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#DayDayUpQ1.py
dayup = pow(1.001, 365)
daydown = pow(0.999, 365)

print("向上：{:.2f},向下：{:.2f}".format(dayup,daydown))

dayfactor = 0.005
dayup = pow(1+dayfactor, 365)
daydown = pow(1-dayfactor, 365)

print("向上：{:.2f},向下：{:.2f}".format(dayup,daydown))

#DayDayUpQ3.py
dayup = 1.0
dayfactor = 0.01
for i in range(365):
    if i % 7 in [6,0]:
        dayup = dayup*(1-dayfactor)
    else:
        dayup = dayup*(1+dayfactor)
print("工作日的力量：{:.2f}".format(dayup))

#DayDayUpQ4.py
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))

-3.3 字符串类型及操作

#WeekNamePrintV1.py
weekStr = "星期一星期二星期三星期四星期五星期六星期日"
weekID = eval(input("请输入星期数字(1-7):"))
pos = (weekID - 1) * 3

print(weekStr[pos:pos+3])

-3.4 模块 2: time 2: time 库的使用

-3.5 实例 4:

#TextProBarV1.py
import time
scale = 10
print("--------执行开始------")
for i in range(scale + 1):
    a = '*' * i
    b = '.' * (scale - i)
    c = (i/scale)*100
    print("{:^3.0f}%[{}->{}]".format(c,a,b))
    time.sleep(0.1)
print("------执行结束------")

#TextProBarV2.py
import time
for i in range(101):
    print("\r{:3}%".format(i),end="")
    time.sleep(0.1)

#TextProBarV3.py
import time
scale = 50
print("执行开始".center(scale//2,"-"))
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,'-'))