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

This article will explain in detail how to judge whether a string is a date in Python. The content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have some understanding of the relevant knowledge after reading this article.

First of all: to determine whether the string is in date format, the best and easiest way is to use strptime in the time module to try to convert the string into a formatted time object. If the conversion is successful, it must be a date format, and if the conversion fails, it must not be a date format.

Second: there are a variety of date formats, and you must consider various possibilities and include them in the template to match, and try strptime many times in order to avoid mistakes and omissions.

Third: if the string you want to judge contains Chinese numbers, you should deal with them and convert Chinese numbers into English numbers.

Code: def isdate (datestr): from time import strptimefrom time import strftime chinesenum = {1: 1: 1, 2: 2, 3: 3, 4: 4, 5: 5, 6: 6, 7: 7, 8: 8, 9: 9, 0: 0 'Ten': '10'} strdate =' 'for i in range (len (datestr)): temp = datestri [I] if temp in chinesenum:if temp =' 10': if datestr [item1] not in chinesenum:strdate + = chineshell [temp] elif datestre [I-1] in chinesenum:continueelse:strdate + = '1'else:strdate + = chineships [temp] else:strdate + = temp pattern = ('% Y% m% m% d','% y% m / d',% y) '% ymuri% mmi% d') output ='% Y% m / m% d 'for i in pattern:try:ret = strptime (strdate, I) if ret:return strftime (output, ret) except:continuereturn Falsedatelist = [' November 23, 2020', 'January 5, 20' ] for i in datelist:print (isdate (I)) out: November 23, 2020, January 05, 2020, January 05, 2020, code explanation:

The more troublesome thing in the code is the conversion of Chinese numbers to English, especially the Chinese number 'ten'. When it exists alone, it should be converted to'10', and when there are no numbers in front of it, there are numbers to turn into'1'. Ignore it when there are numbers in front and behind it.

In addition, if you encounter a date written on the 20th as the 20th, please add processing logic to the code, which is relatively rare. Do not join the loop for the time being to avoid affecting the running efficiency.

I have added four common string date writing methods to partern, and if you encounter the date string you want to deal with, there are other ways to add it.

The same is true in output. You can modify the format of the date output according to your own needs.

On how to determine whether the date of the string in Python is shared here, I hope the above content can be of some help to you, you can learn more knowledge. If you think the article is good, you can share it for more people to see.

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.