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What is a Question Mark “?” and Colon “:” Operator Used for? [duplicate]
...tion on their use? I've read that they are similar to an 'if' 'else' statement.
7 Answers
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How do you test a public/private DSA keypair?
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I found a way that seems to work better for me:
ssh-keygen -y -f <private key file>
That command will output the public key for the given private key, so then just compare the output to each *.pub file.
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Reading an Excel file in python using pandas
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Close: first you call ExcelFile, but then you call the .parse method and pass it the sheet name.
>>> xl = pd.ExcelFile("dummydata.xlsx")
>>> xl.sheet_names
[u'Sheet1', u'Sheet2', u'Sheet3']
>>> df = xl.parse("Sheet1")
>>> df.head()
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Getting the error “Missing $ inserted” in LaTeX
...aused by the underscores and bars. These characters in LaTeX have special meaning in math mode (which is delimited by $ characters). Try escaping them; e.g. update\_element instead of update_element.
However, if you're trying to display code, a better solution would be to use the \verb command, wh...
How to “perfectly” override a dict?
...asses) from the collections.abc module. It even tells you if you missed a method, so below is the minimal version that shuts the ABC up.
from collections.abc import MutableMapping
class TransformedDict(MutableMapping):
"""A dictionary that applies an arbitrary key-altering
function be...
Does PHP have threading?
...be to simply have one script execute another via CLI, but that's a bit rudimentary. Depending on what you are trying to do and how complex it is, this may or may not be an option.
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How to set a JVM TimeZone Properly
I am trying to run a Java program, but it is taking a default GMT timezone instead of an OS defined timezone. My JDK version is 1.5 and the OS is Windows Server Enterprise (2007)
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How do I stop Chrome from yellowing my site's input boxes?
...ete="off" to disable the autocomplete functionality. If this works in Chrome (haven't tested), you could set this attribute when an error is encountered.
This can be used for both a single element
<input type="text" name="name" autocomplete="off">
...as well as for an entire form
<for...
Getting a list of associative array keys
... reference below for browser support. It is supported in Firefox 4.20, Chrome 5, and Internet Explorer 9. Object.keys() contains a code snippet that you can add if Object.keys() is not supported in your browser.
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Deleting Objects in JavaScript
...ccessing one of them would cause a crash. To make them all turn null would mean having extra work when deleting or extra memory for each object.)
Since Javascript is garbage collected, you don't need to delete objects themselves - they will be removed when there is no way to refer to them anymore. ...