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2026年6月27日签到记录贴 - 签到区 - 清泛IT社区，为创新赋能！
本贴是论坛每日签到系统在每天的第一位签到者签到时所自动生成的,如果您还未签到,请点此进行签到的操作. 我在 2026-06-27 08:30 完成签到,是今天第一个签到的用户,获得随机奖励 小红花 4,另外我还额外获得了 小红花 10.我今天最...
Delete the first three rows of a dataframe in pandas
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@DanielMorgan That is not the case as python ranges are half open. As to why that is, is another question. See stackoverflow.com/questions/4504662/… or quora.com/…
– drexiya
May 9 '16 at 7:10
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What is Turing Complete?
...compensate what JS doesn't have. (asm.js should be mentioned here) . Java ,Python or C++ are true 'Turing Complete ' examples. But js? I don't think so.
– Michael IV
Dec 19 '17 at 22:30
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How do I specify a single test in a file with nosetests?
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Wow that's terrible, classic python libraries, not a care for existing interfaces
– Dagrooms
Feb 20 '18 at 16:04
add a comment
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List to array conversion to use ravel() function
I have a list in python and I want to convert it to an array to be able to use ravel() function.
6 Answers
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Jinja2 template variable if None Object set a default value
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I am amazed this simplicity! Python's x or y is if x is false, then y, else x. See: 5.2. Boolean Operations — and, or, not
– kenjiuno
Nov 22 '17 at 2:28
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What are five things you hate about your favorite language? [closed]
...+" is a good operator for concatenation in a strongly typed language (like Python). In a weakly typed language (like Javascript or C) it is terrible; it decides (silently!) that 'sum: '+2+3 is not 'sum: 5' but 'sum: 23'. Someone with more Javascript experience can give better examples.
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TextEnhancer拓展 - 增强App中的文本格式 - App Inventor 2 拓展 - 清泛IT社区，为创新赋能！
About[size=15.008px]Introducing TextEnhancer, the ultimate extension for enhancing text formatting in your App Inventor projects! With TextEnhancer, you can effortlessly add advanced text features to your app, making it more dynamic and engaging for your users.Blocks[size=15.008px]SetTextJustificati...
Clear text from textarea with selenium
...rom selenium.webdriver.common.keys import Keys
#...your code (I was using python 3)
driver.find_element_by_id('foo').send_keys(Keys.CONTROL + "a");
driver.find_element_by_id('foo').send_keys(Keys.DELETE);
share
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How can I check whether a numpy array is empty or not?
... This is great for numpy, but is unfortunate that it is considered unpythonic for lists. Check out discussion for lists: stackoverflow.com/questions/53513/… It would be nice to use same pattern for numpy arrays and lists.
– eric
Jul 28 '19 at 16:41
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