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In Jinja2, how do you test if a variable is undefined?

...man Since 0.2.0 – Samuel Harmer May 11 '17 at 20:09 1 {% if variable is defined and variable %} w...
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Can't su to user jenkins after installing Jenkins

... Community♦ 111 silver badge answered Aug 6 '13 at 13:03 thekbbthekbb 7,07411 gold badge30...
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Using python “with” statement with try-except block

... Bernd PetersohnBernd Petersohn 2,03411 gold badge1414 silver badges77 bronze badges add a comment...
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PostgreSQL: Can you create an index in the CREATE TABLE definition?

... answered Jun 4 '11 at 22:04 ridrid 51.1k2424 gold badges135135 silver badges176176 bronze badges ...
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Iterate through the fields of a struct in Go

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In Java, are enum types inside a class static?

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What does the forward slash mean in the CSS font shorthand?

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Passing multiple error classes to ruby's rescue clause in a DRY fashion

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Install MySQL on Ubuntu without a password prompt

... stefansundin 1,50711 gold badge1313 silver badges1919 bronze badges answered Oct 12 '11 at 13:08 Dimitre RadoulovDimitr...
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PDO get the last ID inserted

... @rybo111, first it's Screaming snake case. second, it's MySQL naming convention and is not PHP – azerafati Jul 23 '15 at 11:56 ...