大约有 44,000 项符合查询结果（耗时：0.0667秒） [XML]
Python argparse: Make at least one argument required
...
if not (args.process or args.upload):
parser.error('No action requested, add -process or -upload')
share
|
improve thi...
Relationship between hashCode and equals method in Java [duplicate]
...hash tables, and hash buckets are a function of the object's .hashCode().
If you have two objects which are .equals(), but have different hash codes, you lose!
The part of the contract here which is important is: objects which are .equals() MUST have the same .hashCode().
This is all documented i...
Is it possible to get the non-enumerable inherited property names of an object?
...etOwnPropertyNames(curr)
props.forEach(function(prop){
if (allProps.indexOf(prop) === -1)
allProps.push(prop)
})
}while(curr = Object.getPrototypeOf(curr))
return allProps
}
I tested that on Safari 5.1 and got
> getAllProperties([1,2,3])
["0"...
MySQL Insert into multiple tables? (Database normalization?)
... the LAST_INSERT_ID() will be updated to that of table 2, and not table 1. If you still need that of table 1 afterwards, we will have to store it in a variable. This leads us to ways 2 and 3:
Will stock the LAST_INSERT_ID() in
a MySQL variable:
INSERT ...
SELECT LAST_INSERT_ID() INTO @mysql_variabl...
How does one write code that best utilizes the CPU cache to improve performance?
... could sound like a subjective question, but what I am looking for are specific instances, which you could have encountered related to this.
...
Loop through all nested dictionary values?
... print out all key value pairs where the value is not a nested dictionary. If the value is a dictionary I want to go into it and print out its key value pairs...etc. Any help?
...
How to compare two strings in dot separated version format in Bash?
...that doesn't require any external utilities:
#!/bin/bash
vercomp () {
if [[ $1 == $2 ]]
then
return 0
fi
local IFS=.
local i ver1=($1) ver2=($2)
# fill empty fields in ver1 with zeros
for ((i=${#ver1[@]}; i<${#ver2[@]}; i++))
do
ver1[i]=0
done
...
Append class if condition is true in Haml
If post.published?
5 Answers
5
...
How can I get the source code of a Python function?
...
If the function is from a source file available on the filesystem, then inspect.getsource(foo) might be of help:
If foo is defined as:
def foo(arg1,arg2):
#do something with args
a = arg1 + arg2
...
Check whether or not the current thread is the main thread
...
If you want a method to be executed on the main thread, you can:
- (void)someMethod
{
dispatch_block_t block = ^{
// Code for the method goes here
};
if ([NSThread isMainThread])
{
block();
...