Shulou(Shulou.com)06/02 Report--

Python how to deal with time, I believe that many inexperienced people do not know what to do, so this paper summarizes the causes of the problem and solutions, through this article I hope you can solve this problem.

# #

# time.time

The representation of time in time module is in the form of timestamp, which is a method of counting time without entanglement. Then let's take a look at the methods that need to be learned in the time module.

Import time

Now = time.time ()

Print now

# 1496065442.08

First of all, you can use the time.time method to check the current time. As a result, he returns 1496065,444. Zero eight. What does this mean? I want to see what time it is. You show me this?! Don't worry, the counting method for time modules starts at 12:00 on January 1, 1970, which is 0. 5%. Then add 1. 5% every second. So which one was more than 1.4 billion just now, and that's all in seconds for the past 40 years or so.

So what's the use of this? I don't like it. How many seconds are there in the past? In fact, this method is more commonly used, generally used to calculate the running time of the program, such as:

Start_time = time.time ()

One_plus = range

For x in one_plus:

Z = x + 100

Print time.time ()-start_time

# 0.000999927520752

And what are the benefits of computing program time? Time is life, time is money! When we find that our developed algorithm has become unusually slow, we should consider whether there is something wrong with the program. And in the training algorithm, consciously calculate the running time of each epoch, you can analyze how long it takes for the whole program to run.

# time.ctime (), time.localtime ()

C_time = time.ctime ()

Print c_time

# Mon May 29 21:58:26 2017

Local_time = time.localtime ()

Print local_time

# time.struct_time (tm_year=2017, tm_mon=5

Tm_mday=29, tm_hour=21, tm_min=58, tm_sec=26

Tm_wday=0, tm_yday=149, tm_isdst=0)

Localtime () returns the local time, including year, month, date, hour, minute, second, day of the week, from 0 to 6, from Monday to Sunday. Tm_yday indicates the number of days of the year, the last one indicates whether it is daylight saving time, and 0 means no.

# time.strftime and time.strptime

Strftime is a common method for formatting output time, which means to output time in a given format. Of course, this format is not your own random format, it should be in line with the Python format. Strftime can convert the time of time type to str character type. Striptime, on the other hand, converts character time into time type. Look at a chestnut.

Import time

Print time.strftime ("% Y_%M_%d_%H_%M_%S")

# 2017_16_29_22_16_13

Print time.strptime ('2017-5-299,'% YMY% MMI% d')

# time.struct_time (tm_year=2017, tm_mon=1, tm_mday=29

Tm_hour=0, tm_min=5, tm_sec=0, tm_wday=6, tm_yday=29

Tm_isdst=-1)

Print time.strptime ("2017 May 5, May 29, 22, 14, 22, 21, 15, 45"

"% Y_%m_%d.%H:%M:%S")

# time.struct_time (tm_year=2017, tm_mon=5

Tm_mday=29, tm_hour=22, tm_min=21, tm_sec=45

Tm_wday=0, tm_yday=149, tm_isdst=-1)

# # datetime # #

# datetime.datetime, datetime.now, datetime. Strftime

Datetime returns more output forms that we have seen, now can get the current date, and strfttime is the function to format the output, which is suitable for both the time class and the datetime class. Then we compare the difference of the output corresponding to different formats, here basically include all possible outputs, the rest is that you can combine them at will. The main difference lies in case and the meaning expressed by different letters. There is no need to remember this, I think, find an output format that pleases your eyes, and then use that every time you use it.

From datetime import datetime

Now = datetime.now ()

# # print

Print now.strftime ("% Y")

Print now.strftime ("% Y% B")

Print now.strftime ("% Y_%B_%d")

Print now.strftime ("% Y_%B_%d.%H")

Print now.strftime ("% Y_%B_%d.%H_%M")

Print now.strftime ("% Y_%B_%d.%H_%M_%S")

# 2017

# 2017_May

# 2017_May_29

# 2017_May_29.22

# 2017_May_29.22_30

# 2017_May_29.22_30_26from datetime import datetime

Now = datetime.now ()

# # print

Print now.strftime ("y")

Print now.strftime ("% yearly% m")

Print now.strftime ("% y_%m_%d")

Print now.strftime ("% y_%m_%d.%I")

Print now.strftime ("% y_%m_%d.%I_%m")

Print now.strftime ("% y_%m_%d.%I_%m_%f")

# 17

# 17_05

# 17_05_29

# 17_05_29.10

# 17_05_29.10_05

# 17059.1005562000 # millisecond output after reading the above content, have you mastered the method of how to deal with time in Python? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.