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How to tell Jackson to ignore a field during serialization if its value is null?
...ample is available in my answer to How to prevent null values inside a Map and null fields inside a bean from getting serialized through Jackson.
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How to sort a dataFrame in python pandas by two or more columns?
Suppose I have a dataframe with columns a , b and c , I want to sort the dataframe by column b in ascending order, and by column c in descending order, how do I do this?
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Jenkins on OS X: xcodebuild gives Code Sign error
...can do that interactively (safer) or by specifying the password on the command line (unsafe), e.g.:
security unlock-keychain -p mySecretPassword...
Obviously, putting this into a script compromises the security of that keychain, so often people setup an individual keychain with only the signing c...
Creating anonymous objects in php
... so there may be a few differences between anonymous classes in JavaScript and PHP.
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Constants in Objective-C
I'm developing a Cocoa application, and I'm using constant NSString s as ways to store key names for my preferences.
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Does have to be in the of an HTML document?
... style tags need to be inside the head of an HTML document? The 4.01 standard implies that, but it's not explicitly stated:
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PHP expresses two different strings to be the same [duplicate]
...umber format, so they will cast into number when they compares.
608E-4234 and 272E-3063 will both be float(0) because they are too small.
For == in php,
If you compare a number with a string or the comparison involves
numerical strings, then each string is converted to a number and the
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Open a file with su/sudo inside Emacs
...sting Emacs session using su or sudo , without dropping down to a shell and doing sudoedit or sudo emacs . One way to do this is
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How do .gitignore exclusion rules actually work?
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@meowsqueak You could possibly ignore /a/b/c and then write a hook to git add --force any matching file pre-commit or something
– Chris
Jun 8 '10 at 23:42
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How to check for changes on remote (origin) Git repository?
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"git fetch origin" and "git show-branch *master" were useful to me.
– Léa Massiot
May 16 '17 at 17:31
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