今日主讲time库和random库
time库
时间获取与格式化
import time
t=time.gmtime()
print(time.strftime("%Y-%m-%d %H:%M:%S",t))
格式化控制符
程序计时
#Count.py
import time
scale = 50
print("执行开始".center(scale//2, "-"))#.center入门四讲过
start = time.perf_counter()
for i in range(scale+1):
a = '*' * i
b = '.' * (scale - i)
