Python学习笔记之时间模块

# 时间模块
import time

# 获取当前时间戳
res = time.time()
print(res) # 1569152220.355634

# 获取当前时间
res = time.ctime()
print(res) # Sun Sep 22 19:38:40 2019

# 格式化时间戳
res = time.ctime(1569152220.355634)
print(res) # Sun Sep 22 19:37:00 2019

# 获取本地时间元组
res = time.localtime()
print(res) # time.struct_time(tm_year=2019, tm_mon=9, tm_mday=22, tm_hour=19, tm_min=40, tm_sec=34, tm_wday=6, tm_yday=265, tm_isdst=0)

# 通过元组获取时间戳
res = time.mktime(( 2019, 9, 28, 10, 10, 10, 0, 0, 0))
print(res) # 1569636610.0

# 通过时间元组 获取 时间字符串
res = time.asctime(( 2019, 9, 28, 10, 10, 10, 0, 0, 0))
print(res) # Mon Sep 28 10:10:10 2019

# sleep 睡眠等待
# time.sleep(2) # 单位为秒数
print('睡醒了吗？')

# strftime(格式化字符串，时间元组) 格式化字符串
res = time.strftime('现在是%Y年%m月%d日%H点%M分%S秒',time.localtime())
print(res)

# strptime() 将字符串里面的时间提取出来
res = time.strptime('现在是2019年09月22日20点01分59秒','现在是%Y年%m月%d日%H点%M分%S秒')
print(res) # time.struct_time(tm_year=2019, tm_mon=9, tm_mday=22, tm_hour=20, tm_min=1, tm_sec=59, tm_wday=6, tm_yday=265, tm_isdst=-1) 

# perf_counter() 用于计算程序运行时间
start_time = time.perf_counter()
n = 0
while n < 999:
    n+=1
end_time = time.perf_counter()

print(end_time - start_time)