常用的時間模塊
1.time 時間戳
2.datetime
3.python-deteutil(pip install)
常用的操作：
1.時間各種格式表示
2.各種加減運算
import time
time.time() #時間戳
1533133461.6765099
start = time.time()
print(start)
1533133482.158626
end = time.time()
print(f'過了 {end - start} 秒')
過了 73.09727120399475 秒
start = time.time()
# 執行各種操作
for i in range(100): # 計算循環用了多長時間
print(i)
end = time.time()
print(f'過了{end - start} s')
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過了0.0 s
# time.sleep()
for i in range(5):
time.sleep(1)
print(i)
0
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# 結構化時間與時間戳的轉換
time.localtime() # 返回的是元祖
time.struct_time(tm_year=2018, tm_mon=8, tm_mday=1, tm_hour=22, tm_min=29, tm_sec=35, tm_wday=2, tm_yday=213, tm_isdst=0)
time.localtime(10) #距離1970年的時間轉換
time.struct_time(tm_year=1970, tm_mon=1, tm_mday=1, tm_hour=8, tm_min=0, tm_sec=10, tm_wday=3, tm_yday=1, tm_isdst=0)
time.mktime(time.localtime())
1533134001.0
time.mktime(time.localtime()) # 返回的浮點數時間戳
1533134010.0
for i in range(10):
time.sleep(1)
print(time.mktime(time.localtime()))
1533134061.0
1533134062.0
1533134063.0
1533134064.0
1533134065.0
1533134066.0
1533134067.0
1533134068.0
1533134069.0
1533134070.0
# 結構化時間與字符串格式的轉換
# 時間的字符串格式化：http://devdocs.io/python~3.6/library/time#time.strftime
# time.strftime?
'''
%Y Year with century as a decimal number.
%m Month as a decimal number [01,12].
%d Day of the month as a decimal number [01,31].
%H Hour (24-hour clock) as a decimal number [00,23].
%M Minute as a decimal number [00,59].
%S Second as a decimal number [00,61].
%z Time zone offset from UTC.
%a Locale's abbreviated weekday name.
%A Locale's full weekday name.
%b Locale's abbreviated month name.
%B Locale's full month name.
%c Locale's appropriate date and time representation.
%I Hour (12-hour clock) as a decimal number [01,12].
%p Locale's equivalent of either AM or PM.
'''
"\n%Y Year with century as a decimal number.\n%m Month as a decimal number [01,12].\n%d Day of the month as a decimal number [01,31].\n%H Hour (24-hour clock) as a decimal number [00,23].\n%M Minute as a decimal number [00,59].\n%S Second as a decimal number [00,61].\n%z Time zone offset from UTC.\n%a Locale's abbreviated weekday name.\n%A Locale's full weekday name.\n%b Locale's abbreviated month name.\n%B Locale's full month name.\n%c Locale's appropriate date and time representation.\n%I Hour (12-hour clock) as a decimal number [01,12].\n%p Locale's equivalent of either AM or PM.\n"
# 結構化時間與字符串格式的轉換
# 時間的字符串格式化
time.strftime("%Y-%m-%d %X", time.localtime())
'2018-08-01 22:40:28'
for i in range(5):
time.sleep(1)
print(time.strftime("%Y-%m-%d %X", time.localtime()))
2018-08-01 22:41:27
2018-08-01 22:41:28
2018-08-01 22:41:29
2018-08-01 22:41:30
2018-08-01 22:41:31
time.strptime("2018-08-01 22:41:31", "%Y-%m-%d %X") #與上面的逆向轉換
time.struct_time(tm_year=2018, tm_mon=8, tm_mday=1, tm_hour=22, tm_min=41, tm_sec=31, tm_wday=2, tm_yday=213, tm_isdst=-1)
for i in range(5):
time.sleep(1)
print(time.strptime("2018-08-01 22:41:31", "%Y-%m-%d %X"))
time.struct_time(tm_year=2018, tm_mon=8, tm_mday=1, tm_hour=22, tm_min=41, tm_sec=31, tm_wday=2, tm_yday=213, tm_isdst=-1)
time.struct_time(tm_year=2018, tm_mon=8, tm_mday=1, tm_hour=22, tm_min=41, tm_sec=31, tm_wday=2, tm_yday=213, tm_isdst=-1)
time.struct_time(tm_year=2018, tm_mon=8, tm_mday=1, tm_hour=22, tm_min=41, tm_sec=31, tm_wday=2, tm_yday=213, tm_isdst=-1)
time.struct_time(tm_year=2018, tm_mon=8, tm_mday=1, tm_hour=22, tm_min=41, tm_sec=31, tm_wday=2, tm_yday=213, tm_isdst=-1)
time.struct_time(tm_year=2018, tm_mon=8, tm_mday=1, tm_hour=22, tm_min=41, tm_sec=31, tm_wday=2, tm_yday=213, tm_isdst=-1)
