详解Python time库的使用

> import time
> time.time()
1570530861.740123
> time.ctime()
'Tue Oct 8 18:34:27 2019'
> time.gmtime()
time.struct_time(tm_year=2019, tm_mon=10, tm_mday=8, tm_hour=10, tm_min=34, tm_sec=52, tm_wday=1, tm_yday=281, tm_isdst=0)

time.strftime(format[, t])
format – 格式字符串。
t – 可选的参数t是一个struct_time对象。
python中时间日期格式化符号：
%Y 年份
%m 月份
%B 月份名称 January
%b 月份名称缩写 Jan
%d 日期
%A 星期 Monday
%a 星期缩写 Mon
%H 小时 24
%h 小时 12
%p 上下午
%M 分钟
%S 秒
> t=time.gmtime()
> time.strftime("%Y-%m-%d %H:%M:%S", t)
'2019-10-08 10:38:06'
> time.strftime("%Y-%B-%d-%A-%H-%p-%S")
'2019-October-08-Tuesday-18-PM-50'
> time.strftime("%A-%p")
'Tuesday-PM'
> time.strftime("%M:%S")
'39:59'

> start = time.perf_counter()
> start
684.980333384
> end = time.perf_counter()
> end
696.094559111
> end-start
11.114225726999962

#TextProBarV3.py
import time
scale = 40
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}".format(c,a,b,dur),end='')
  time.sleep(0.1)
print('\n'+'执行结果'.center(scale//2,'-'))

#DrawSevenSegDisplay.py
import turtle, datetime
def drawGap(): #绘制数码管间隔
  turtle.penup()
  turtle.fd(5)
def drawLine(draw):  #绘制单段数码管
  drawGap()
  turtle.pendown() if draw else turtle.penup()
  turtle.fd(40)
  drawGap()
  turtle.right(90)
def drawDigit(d): #根据数字绘制七段数码管
  drawLine(True) if d in [2,3,4,5,6,8,9] else drawLine(False)
  drawLine(True) if d in [0,1,3,4,5,6,7,8,9] else drawLine(False)
  drawLine(True) if d in [0,2,3,5,6,8,9] else drawLine(False)
  drawLine(True) if d in [0,2,6,8] else drawLine(False)
  turtle.left(90)
  drawLine(True) if d in [0,4,5,6,8,9] else drawLine(False)
  drawLine(True) if d in [0,2,3,5,6,7,8,9] else drawLine(False)
  drawLine(True) if d in [0,1,2,3,4,7,8,9] else drawLine(False)
  turtle.left(180)
  turtle.penup()
  turtle.fd(20)
def drawDate(date):
  turtle.pencolor("red")
  for i in date:
    if i == '-':
      turtle.write('年',font=("Arial", 18, "normal"))
      turtle.pencolor("green")
      turtle.fd(40)
    elif i == '=':
      turtle.write('月',font=("Arial", 18, "normal"))
      turtle.pencolor("blue")
      turtle.fd(40)
    elif i == '+':
      turtle.write('日',font=("Arial", 18, "normal"))
    else:
      drawDigit(eval(i))
def main():
  turtle.setup(800, 350, 200, 200)
  turtle.penup()
  turtle.fd(-350)
  turtle.pensize(5)
  drawDate(datetime.datetime.now().strftime('%Y-%m=%d+'))
  turtle.hideturtle()
main()