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Why is creating a Thread said to be expensive?
...urces as long as it is alive; e.g. the thread stack, any objects reachable from the stack, the JVM thread descriptors, the OS native thread descriptors.
The costs of all of these things are platform specific, but they are not cheap on any Java platform I've ever come across.
A Google search foun...
How to replace multiple substrings of a string?
...s my dog and this is my pig."
One possible fix is to use an OrderedDict.
from collections import OrderedDict
def replace_all(text, dic):
for i, j in dic.items():
text = text.replace(i, j)
return text
od = OrderedDict([("cat", "dog"), ("dog", "pig")])
my_sentence = "This is my cat a...
Why does this Java code compile?
...se restrictions are intended to prevent code like
int j = i;
int i = j;
from compiling. The Java spec says "the restrictions above are designed to catch, at compile time, circular or otherwise malformed initializations."
What do these rules actually boil down to?
In short, the rules basically s...
Correct way to try/except using Python requests module?
...xception is raised.
All exceptions that Requests explicitly raises inherit from requests.exceptions.RequestException.
To answer your question, what you show will not cover all of your bases. You'll only catch connection-related errors, not ones that time out.
What to do when you catch the exception...
Scala: List[Future] to Future[List] disregarding failed futures
... futures `fs`, returns the future holding the list of Try's of the futures from `fs`.
* The returned future is completed only once all of the futures in `fs` have been completed.
*/
def allAsTrys[T](fItems: /* future items */ List[Future[T]]): Future[List[Try[T]]] = {
val listO...
Is there any way to kill a Thread?
...read):
'''A thread class that supports raising exception in the thread from
another thread.
'''
def _get_my_tid(self):
"""determines this (self's) thread id
CAREFUL : this function is executed in the context of the caller
thread, to get the identity of the...
Accept server's self-signed ssl certificate in Java client
... truststore or configure your client to
Option 1
Export the certificate from your browser and import it in your JVM truststore (to establish a chain of trust):
<JAVA_HOME>\bin\keytool -import -v -trustcacerts
-alias server-alias -file server.cer
-keystore cacerts.jks -keypass changeit
-sto...
What are the “standard unambiguous date” formats for string-to-date conversion in R?
...
This is documented behavior. From ?as.Date:
format: A character string. If not specified, it will try
'"%Y-%m-%d"' then '"%Y/%m/%d"' on the first non-'NA' element,
and give an error if neither works.
as.Date("01 Jan 2000") ...
How to check for valid email address? [duplicate]
...ng the real name and the actual address parts of the e-mail:
>>> from email.utils import parseaddr
>>> parseaddr('foo@example.com')
('', 'foo@example.com')
>>> parseaddr('Full Name <full@example.com>')
('Full Name', 'full@example.com')
>>> parseaddr('"Ful...
Check if a given key already exists in a dictionary
...for any key you can either use dict.setdefault() repeatedly or defaultdict from the collections module, like so:
from collections import defaultdict
d = defaultdict(int)
for i in range(100):
d[i % 10] += 1
but in general, the in keyword is the best way to do it.
...