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- AI 助手 - 清泛IT社区，为创新赋能！
...为对话中 ai2claw 关于此问题的补充调研
用户提问：TextBox输入字符串后，只用"判断为空"积木块（string-empty?），也报错"Infinity or NaN:Infinity"，这是为什么？
ai2claw 分析：
"Infinity or NaN:Infinity" 这个报错...
扒了一下源码，ESP8285接入App Inventor有4种玩法，第3种最香 - AI 助手 - ...
...lash版本。CPU一样（Tensilica L106 80/160MHz），WiFi一样（802.11 b/g/n），GPIO一样（17个），区别就一个：ESP8285把1MB Flash直接塞进芯片里了，省了外部SPI Flash。
这意味着ESP8266的代码在ESP8285上100%能跑，Arduino ESP8266 Core和ESP-IDF都直接兼...
how to check if a file is a directory or regular file in python? [duplicate]
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os.path.isfile("bob.txt") # Does bob.txt exist? Is it a file, or a directory?
os.path.isdir("bob")
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How can I extract all values from a dictionary in Python?
...y values -0.3246, -0.9185, and -3985 use: your_dict.values().
If you want both keys and values use: your_dict.items() which returns a list of tuples [(key1, value1), (key2, value2), ...].
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How to sort an ArrayList in Java [duplicate]
... of this class and adding each fruit in the list. I want to sort this list based on the order of fruit name.
3 Answers
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Convert generator object to list for debugging [duplicate]
When I'm debugging in Python using IPython, I sometimes hit a break-point and I want to examine a variable that is currently a generator. The simplest way I can think of doing this is converting it to a list, but I'm not clear on what's an easy way of doing this in one line in ipdb , since I'm so n...
What do numbers using 0x notation mean?
What does a 0x prefix on a number mean?
5 Answers
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程序员：编程能力与编程年龄的关系 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...一些感受：
这些年来的对于外企和国内感受—— 国外牛B的IT公司的工程能力并不见得比国内的要强多少，但是国外那些NB的IT公司的架构和设计能力远远超过国内的公司，最可怕的是，那些有超强架构和设计能力的“老程序员...
count(*) vs count(column-name) - which is more correct? [duplicate]
... rows
COUNT(column) counts non-NULLs only
COUNT(1) is the same as COUNT(*) because 1 is a non-null expressions
Your use of COUNT(*) or COUNT(column) should be based on the desired output only.
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Set value to NULL in MySQL
I want a value to be set to NULL if nothing is put into the text box in the form I'm submitting. How can I make this happen?
I've tried inserting 'NULL' but this just adds the word NULL into the field.
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