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What is the easiest way to remove all packages installed by pip?
...to exclude those lines and remove the packages manually (elevated from the comments below):
pip freeze | grep -v "^-e" | xargs pip uninstall -y
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How to test equality of Swift enums with associated values
...se the default statement in the switch, so if you add a new enum case, the compiler doesn't make sure you add the clause to compare that new case for equality – you'll just have to remember and be careful when you make changes later down the line!
– Michael Waterfall
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When would anyone use a union? Is it a remnant from the C-only days?
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Unions are usually used with the company of a discriminator: a variable indicating which of the fields of the union is valid. For example, let's say you want to create your own Variant type:
struct my_variant_t {
int type;
union {
char char_...
Smart pointers: who owns the object? [closed]
...a naked pointer, the rules can be documented, but won't be enforced by the compiler and the code.
– Fabio Ceconello
May 18 '09 at 23:07
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How do I see if Wi-Fi is connected on Android?
...... your code here could throw a null pointer error. See developer.android.com/training/basics/network-ops/managing.html and in particular "The method getActiveNetworkInfo() returns a NetworkInfo..."
– eb80
Jun 5 '14 at 12:24
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Encrypt and decrypt a string in C#?
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EDIT 2013-Oct: Although I've edited this answer over time to address shortcomings, please see jbtule's answer for a more robust, informed solution.
https://stackoverflow.com/a/10366194/188474
Original Answer:
Here's a working example derived from the "RijndaelManaged Class" documentation and the...
Project structure for Google App Engine
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How to randomly select rows in SQL?
..., Name FROM customerNames
ORDER BY NEWID()
That said, everybody seems to come to this page for the more general answer to your question:
Selecting a random row in SQL
Select a random row with MySQL:
SELECT column FROM table
ORDER BY RAND()
LIMIT 1
Select a random row with PostgreSQL:
SELECT ...
Javascript switch vs. if…else if…else
...here is a direct link to a segment in the article addressing that: oreilly.com/server-administration/excerpts/even-faster-websites/…
– edhedges
May 6 '13 at 13:43
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Order of serialized fields using JSON.NET
...ion around the desire for Order to be respected in deserialisation: github.com/JamesNK/Newtonsoft.Json/issues/758 Basically no chance of this one.
– Tyeth
Apr 9 '19 at 14:40
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