大约有 46,000 项符合查询结果（耗时：0.0494秒） [XML]
How to convert SQL Query result to PANDAS Data Structure?
...etchall()) returns ValueError: DataFrame constructor not properly called!, it appears that the tuple of tuples is not acceptable for DataFrame constructor. There is also no .keys() on cursor either in dictionary or tuple mode.
– Mobigital
Jan 20 '19 at 20:45
...
What exactly does an #if 0 … #endif block do?
...
Not only does it not get executed, it doesn't even get compiled.
#if is a preprocessor command, which gets evaluated before the actual compilation step. The code inside that block doesn't appear in the compiled binary.
It's often used fo...
Interfaces — What's the point?
The reason for interfaces truly eludes me. From what I understand, it is kind of a work around for the non-existent multi-inheritance which doesn't exist in C# (or so I was told).
...
How to render a DateTime object in a Twig template
One of my fields in one of my entities is a "datetime" variable.
9 Answers
9
...
Favorite Django Tips & Features?
...tion series 'Hidden features of ...', I am curious to hear about your favorite Django tips or lesser known but useful features you know of.
...
“for loop” with two variables? [duplicate]
...
If you want the effect of a nested for loop, use:
import itertools
for i, j in itertools.product(range(x), range(y)):
# Stuff...
If you just want to loop simultaneously, use:
for i, j in zip(range(x), range(y)):
# Stuff...
Note that if x and y are not the same length, ...
How do you run a SQL Server query from PowerShell?
Is there a way to execute an arbitrary query on a SQL Server using Powershell on my local machine?
8 Answers
...
Using Sinatra for larger projects via multiple files
It seems that in Sinatra all route handlers are being written into a single file, if I understand right it acts as a one large/small controller. Is there any way to split it into separate independent files, so when let's say somebody calls "/" - one action is executed, and if smth like "/posts/2" is...
Count how many records are in a CSV Python?
...m(1 for row in fileObject) # fileObject is your csv.reader
Using sum() with a generator expression makes for an efficient counter, avoiding storing the whole file in memory.
If you already read 2 rows to start with, then you need to add those 2 rows to your total; rows that have already been rea...
How do I test a file upload in rails?
...
Searched for this question and could not find it, or its answer on Stack Overflow, but found it elsewhere, so I'm asking to make it available on SO.
The rails framework has a function fixture_file_upload (Rails 2 Rails 3, Rails 5), which will search your fixtures direct...