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Can existing virtualenv be upgraded gracefully?
...rtual env using new python
virtualenv /opt/virtualenv --python=/opt/python276/bin/python
note: if needed it can be done with a different user
chown pyuser -R /opt/virtualenv
su - pyuser
source /opt/virtualenv/bin/activate
python -v
Create virtual env:
virtualenv /opt/virtualenv
su - infografic...
Ruby on Rails: How do I add a not null constraint to an existing column using a migration?
...
276
You can also use change_column_null:
change_column_null :table_name, :column_name, false
...
How can I make a div stick to the top of the screen once it's been scrolled to?
...
276
You could use simply css, positioning your element as fixed:
.fixedElement {
background-c...
Where does the “flatmap that s***” idiomatic expression in Scala come from?
...
Jens SchauderJens Schauder
61.3k2424 gold badges140140 silver badges279279 bronze badges
...
What is the maximum length of a URL in different browsers?
...more details specific limits.
Longer answer - first, the standards...
RFC 2616 (Hypertext Transfer Protocol HTTP/1.1) section 3.2.1 says
The HTTP protocol does not place
any a priori limit on the length of
a URI. Servers MUST be able to handle
the URI of any resource they serve,
and SHOULD be ab...
Can I stop 100% Width Text Boxes from extending beyond their containers?
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276
Is there any way to make a text box fill the width of its container without expanding beyon...
Is Java's assertEquals method reliable?
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276
You should always use .equals() when comparing Strings in Java.
JUnit calls the .equals() met...
decimal vs double! - Which one should I use and when? [duplicate]
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Chris SChris S
61.4k4949 gold badges214214 silver badges235235 bronze badges
...
When to use the different log levels
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61
FATAL is when the sysadmin wakes up, decides he's not paid enough for this, and goes back to sleep.
– Mateen Ulhaq
...
How does this giant regex work?
...or looks like when it is accessed:
the hex part of the code:
\x65\x76\x61\x6C\x28\x67\x7A\x69\x6E\x66\x6C\x61\x74\x65\x28\x62\x61\x73\x65\x36\x34\x5F\x64\x65\x63\x6F\x64\x65\x28
is acutally:
eval(gzinflate(base64_decode(
This is the code will print out the source code for this backdoor. Howe...