current_time=datetime.datetime.now()
print(current_time.replace(year=1977))#1977-06-20 17:18:11.543876

print(datetime.date.fromtimestamp(1111111111))#2005-03-18
print(datetime.date.fromtimestamp(time.time()) )  # 时间戳直接转成日期格式 2016-08-19

6.11 打印进度条

def progress(percent,width=50):
    if percent > 1:
        percent=1
    show_str=('[%%-%ds]' %width) %(int(width*percent) * '#')
    print('\r%s %d%%' %(show_str,int(100*percent)),end='')
?
import time
recv_size=0
total_size=8097
while recv_size < total_size:
    time.sleep(0.1)
    recv_size+=80
    percent=recv_size / total_size
    progress(percent)

6.12 random 模块