day21__模块（一）

python标准库

第三方模块

自定义模块

time

import time

# #时间戳  #计算
print(time.time())   #1526978022.5141296

time.sleep(5)

print(time.localtime(1511242343))
#time.struct_time(tm_year=2017, tm_mon=11, tm_mday=21, tm_hour=13, tm_min=32, tm_sec=23, tm_wday=1, tm_yday=325, tm_isdst=0)
t=time.localtime()
print(t.tm_year) #2018
print(t.tm_wday) #1
# #-----#结构化时间---UTC
print(time.gmtime())
#time.struct_time(tm_year=2018, tm_mon=5, tm_mday=22, tm_hour=8, tm_min=41, tm_sec=33, tm_wday=1, tm_yday=142, tm_isdst=0)

#-----将结构化时间转换成时间戳
print(time.mktime(time.localtime()))  #1526978549.0
#------将结构化时间转成字符串时间strftime
print(time.strftime("%Y---%m-%d %X",time.localtime()))  #2018---05-22 16:42:54
#------将字符串时间转成结构化时间strptime
print(time.strptime("2016:12:24:17:50:36","%Y:%m:%d:%X"))
#time.struct_time(tm_year=2016, tm_mon=12, tm_mday=24, tm_hour=17, tm_min=50, tm_sec=36, tm_wday=5, tm_yday=359, tm_isdst=-1)
print(time.asctime())   #Tue May 22 16:43:19 2018
print(time.ctime())     #Tue May 22 16:43:19 2018

random

import random

ret=random.random()             #0.8118528300987962   0到1的浮点数
ret=random.randint(1,3)         #3 整型
ret=random.randrange(1,3)           #2
ret=random.choice([11,22,33,44,55])     #55 随机
ret=random.sample([11,22,33,44,55],2)  #[22, 11]
ret=random.uniform(1,4)                 #1.2265044697702803  1到4的浮点数


ret=[1,2,3,4,5]
random.shuffle(ret)
print(ret)                      #[3, 4, 5, 1, 2]  #随机排序

def v_code():
    ret=""
    for i in range(5):
        num=random.randint(0,9)
        alf=chr(random.randint(65,122))
        s=str(random.choice([num,alf]))
        ret+=s
    return ret
print(v_code())  #8EN39