Why is SMS CAPTCHA not humanized?

I found that the mobile phone CAPTCHA sent when registering on the Internet is usually a 4-digit, 6-digit pure digital verification. But this kind of user experience is not good, if it is very long and easy to type wrong, it is usually a random number between 1111 and 999999. Why not design it into three. Or a number that is easier to enter with a hyphen?

CAPTCHA python
Mar.05,2021

this is also an indirect default standard, too little (too little is possible to try to get the right number), too much is not good, 4-6 is the best, 6-digit is the best, you see Alipay, WeChat Pay 6-digit, bank card password 6-digit

Previous: Is there a way to convert url to base64 coding?

Next: The picture uploaded by ueditor cannot be displayed.

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e7f964-a69.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e7f964-a69.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?