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Xcode - How to fix 'NSUnknownKeyException', reason: … this class is not key value coding-compliant f
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'NSUnknownKeyException', reason: '[<UIViewController 0x3927310> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key string.'
It is caused by the Second view controller in MainWindow.xib having a class of UIViewController instead of SecondView. Changing t...
How can I filter lines on load in Pandas read_csv function?
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Conditional Replace Pandas
...hich df.my_channel > 20000 is True, while df.loc[mask, column_name] = 0 sets the value 0 to the selected rows where maskholds in the column which name is column_name.
Update:
In this case, you should use loc because if you use iloc, you will get a NotImplementedError telling you that iLocation b...
How to add line break for UILabel?
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Use \n as you are using in your string.
Set numberOfLines to 0 to allow for any number of lines.
label.numberOfLines = 0;
Update the label frame to match the size of the text using sizeWithFont:. If you don't do this your text will be vertically centered or cut ...
How do you do a case insensitive search using a pattern modifier using less?
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You can also set the environment variable LESS
I use LESS=-Ri, so that I can pump colorized output from grep into it, and maintain the ANSI colour sequences.
Another little used feature of less that I found is starting it with +F as an ...
Calculate RSA key fingerprint
...y, you do not necessarily need to run ssh-agent. Assuming PRIVKEY has been set to the private key file, and PUBKEY has been set to the (initially nonexistent) public key file, do: ssh-keygen -y -f "${PRIVKEY}" > "${PUBKEY}" to regenerate the SSH public key, then ssh-keygen -E md5 -l -v -f "${PUBK...
Get MD5 hash of big files in Python
... @user2084795 open always opens a fresh file handle with the position set to the start of the file, (unless you open a file for append).
– Steve Barnes
Jul 5 '17 at 9:15
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How to get a number of random elements from an array?
...r for small samples from large ranges indeed. Especially with using an ES6 Set (which wasn't available in '13 :-/)
– Bergi
Aug 8 '17 at 0:22
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Android Google Maps v2 - set zoom level for myLocation
Is it possible to change the zoom level for myLocation with the new Google Maps API v2?
13 Answers
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When and why are database joins expensive?
...r special cases
It all comes back to mitigating the size of the working set. Joins involving properly selected keys with correctly set up indexes are cheap, not expensive, because they allow significant pruning of the result before the rows are materialised.
Materialising the result involves bu...