大约有 47,000 项符合查询结果（耗时：0.0632秒） [XML]
How to merge every two lines into one from the command line?
...rget about paste. It rocks for this problem. I needed to combine all lines from stdin and did it easily with paste -sd ' ' -.
– Clint Pachl
Aug 8 '14 at 6:52
4
...
How to change the port of Tomcat from 8080 to 80?
... This answer lacks the /etc/authbind information, see answer from Rose below
– jorfus
Mar 9 '16 at 4:28
add a comment
|
...
JPG vs. JPEG image formats
... application use, and .jpeg , with which Image Capture saves the images from scanning with my Canon MX455 printer. LaTeX doesn't seem to distinguish, as I gave it a .jpeg with the extension changed to .jpg and the result seems to be the same as if it had been a .jpg right from the start...
Creating a dictionary from a csv file?
I am trying to create a dictionary from a csv file. The first column of the csv file contains unique keys and the second column contains values. Each row of the csv file represents a unique key, value pair within the dictionary. I tried to use the csv.DictReader and csv.DictWriter classes, but I...
Shorter syntax for casting from a List to a List?
I know its possible to cast a list of items from one type to another (given that your object has a public static explicit operator method to do the casting) one at a time as follows:
...
How to extract the year from a Python datetime object?
I would like to extract the year from the current date using Python.
4 Answers
4
...
When should an IllegalArgumentException be thrown?
...icate that a method has been passed an illegal or inappropriate argument.
From looking at how it is used in the JDK libraries, I would say:
It seems like a defensive measure to complain about obviously bad input before the input can get into the works and cause something to fail halfway through wi...
what is the difference between ?:, ?! and ?= in regex?
..."ab".
The difference between ?: and ?= is that ?= excludes the expression from the entire match while ?: just doesn't create a capturing group. So for example a(?:b) will match the "ab" in "abc", while a(?=b) will only match the "a" in "abc". a(b) would match the "ab" in "abc" and create a capture ...
MongoDB and “joins” [duplicate]
....mongodb.org/master/reference/operator/aggregation/lookup/#pipe._S_lookup
From the docs:
{
$lookup:
{
from: <collection to join>,
localField: <field from the input documents>,
foreignField: <field from the documents of the "from" collection>,
a...
How can you set class attributes from variable arguments (kwargs) in python
... self.B = True
# get a list of all predefined values directly from __dict__
allowed_keys = list(self.__dict__.keys())
# Update __dict__ but only for keys that have been predefined
# (silently ignore others)
self.__dict__.update((key, value) for key, val...