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Relative imports in Python 3
...module.py like this...
#!/usr/bin/env python3
# Exported function
def as_int(a):
return int(a)
# Test function for module
def _test():
assert as_int('1') == 1
if __name__ == '__main__':
_test()
...a myothermodule.py like this...
#!/usr/bin/env python3
from .mymodule import as_i...
How to estimate how much memory a Pandas' DataFrame will need?
...718016/1024/1024 = 392.6, so df.info(memory_usage="deep") may use 2^10 to convert byte to MB, which makes me confused. Thanks for your help anyway :D.
– Catbuilts
Oct 30 '18 at 4:01
...
Timer function to provide time in nano seconds using C++
...e for the clock period. This constant only comes into play if you want to convert the number of clock ticks into some real-time unit such as nanoseconds. And in that case, the more accurate you are able to supply the clock speed, the more accurate will be the conversion to nanoseconds, (millisecon...
c++ 写日志通用类，可设置日志级别 - C/C++ - 清泛网 - 专注C/C++及内核技术
...e LEVEL_INFO 3
#define LEVEL_VERBOSE 4
#define LEVEL_DEBUG 5
static int nLoggerLevel = LEVEL_INFO;
void SetLoggerLevel(int nLevel);
void Log(int nLevel, LPCSTR func, INT line, LPCTSTR fmt, ...);
static const char * const LOGGER_LEVEL_NAME[] = {"崩溃", "错误", "警告", "信息", "详...
Sql query to insert datetime in SQL Server
...f you are married to the dd-mm-yy hh:mm:ss xm format, you will need to use CONVERT with the specific style.
insert into table1 (approvaldate)
values (convert(datetime,'18-06-12 10:34:09 PM',5));
5 here is the style for Italian dates. Well, not just Italians, but that's the culture it's attr...
TSQL - Cast string to integer or return default value
...
If you are on SQL Server 2012 (or newer):
Use the TRY_CONVERT function.
If you are on SQL Server 2005, 2008, or 2008 R2:
Create a user defined function. This will avoid the issues that Fedor Hajdu mentioned with regards to currency, fractional numbers, etc:
CREATE FUNCTION dbo.T...
In-memory size of a Python structure
... sys
>>> import decimal
>>>
>>> d = {
... "int": 0,
... "float": 0.0,
... "dict": dict(),
... "set": set(),
... "tuple": tuple(),
... "list": list(),
... "str": "a",
... "unicode": u"a",
... "decimal": decimal.Decimal(0),
... "objec...
Maximum value for long integer
How can I assign the maximum value for a long integer to a variable, similar, for example, to C++'s LONG_MAX .
7 Answers
...
What do 'real', 'user' and 'sys' mean in the output of time(1)?
...up in the jump table; the kernel has a finite number of controlled entry points.
The 'system' calls in the C library (particularly those described in Section 2 of the man pages) have a user-mode component, which is what you actually call from your C program. Behind the scenes, they may issue one o...
Simple Digit Recognition OCR in OpenCV-Python
...size(ROI,tmp1, Size(10,10), 0,0,INTER_LINEAR ); //resize to 10X10
tmp1.convertTo(tmp2,CV_32FC1); //convert to float
sample.push_back(tmp2.reshape(1,1)); // Store sample data
imshow("src",src);
int c=waitKey(0); // Read corresponding label for contour from keyoard
c-=0x30; //...