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How to print instances of a class using print()?
...ill act the following way in the Python shell:
>>> t = Test(123, 456)
>>> t
<Test a:123 b:456>
>>> print repr(t)
<Test a:123 b:456>
>>> print(t)
From str method of Test: a is 123, b is 456
>>> print(str(t))
From str method of Test: a is 123, ...
Find which version of package is installed with pip
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edited Aug 21 '14 at 3:06
community wiki
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How to find the duration of difference between two dates in java?
...t diffInDays = (int) ((dt2.getTime() - dt1.getTime()) / (1000 * 60 * 60 * 24));
if (diffInDays > 1) {
System.err.println("Difference in number of days (2) : " + diffInDays);
return false;
} else if (diffHours > 24) {
System.err.println(">...
What's the difference between using CGFloat and float?
... introduced to make it easier to write code that works on both 32-bit and 64-bit without modification. However, if all you need is float precision within your own code, you can still use float if you like — it will reduce your memory footprint somewhat. Same goes for integer values.
I suggest yo...
Rounding up to next power of 2
...power of 2 number. For example if my input is 789, the output should be 1024. Is there any way of achieving this without using any loops but just using some bitwise operators?
...
App Inventor 2 串口通信教程 - USB串口与蓝牙串口 · App Inventor 2 中文网
... 2. 串口打开失败（USB 模式）
3. 接收数据乱码
4. 数据接收不完整
5. 浮点数传输精度丢失
6. 多条数据粘包
最佳实践
通信协议设计
调试技巧
性能优化
参考资源
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Is there a performance difference between a for loop and a for-each loop?
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From Item 46 in Effective Java by Joshua Bloch :
The for-each loop, introduced in
release 1.5, gets rid of the clutter
and the opportunity for error by
hiding the iterator or index variable
completely. The resulting idiom
...
Why can't C compilers rearrange struct members to eliminate alignment padding? [duplicate]
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edited Dec 4 '13 at 9:55
answered Feb 28 '12 at 18:31
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What is a None value?
...u have to write yourself with lines like F = "fork" and A = 2 and c17 = 3.14, and then you can stick them on other objects later (like F = 10 or F = None; it's all the same.)
Briggs is pretending that all possible stickers you might want to write were already stuck to the None object.
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What is the difference between join and merge in Pandas?
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94
I always use join on indices:
import pandas as pd
left = pd.DataFrame({'key': ['foo', 'bar'], '...