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Change one value based on another value in pandas
... solution (it is explicitly discouraged in the docs), but it is useful to know about:
import pandas
df = pandas.read_csv("test.csv")
df['FirstName'][df.ID == 103] = "Matt"
df['LastName'][df.ID == 103] = "Jones"
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Where does PostgreSQL store the database?
...ific folder is painful as someone else might have installed it for you and now you do not know the configuration, so following sql helps to save the time. :) Thanks Mike.
– Vishal
Jun 14 '13 at 8:54
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python: How do I know what type of exception occurred?
...y, it's so that you don't hide:
the fact that an error occurred
the specifics of the error that occurred (error hiding antipattern)
So as long as you take care to do none of those things, it's OK to catch the generic exception. For instance, you could provide information about the exception to ...
What does “./bin/www” do in Express 4.x?
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Because the app.js file that was generated by the Express 4 generator is now a Node.js module, it can no longer be started independently as an app (unless you modify the code). The module must be loaded in a Node.js file and started via the Node.js file. The Node.js file is ./bin/www in this case....
Difference between len() and .__len__()?
Is there any difference between calling len([1,2,3]) or [1,2,3].__len__() ?
4 Answers
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What is the purpose of python's inner classes?
...es confuse me. Is there something that can't be accomplished without them? If so, what is that thing?
9 Answers
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LINQ - Full Outer Join
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I don't know if this covers all cases, logically it seems correct. The idea is to take a left outer join and right outer join then take the union of the results.
var firstNames = new[]
{
new { ID = 1, Name = "John" },
new { I...
Auto code completion on Eclipse
...o boxes having checkboxes.
3. check everthing in there and click apply.
4. now ofcourse when you'll be coding there will be auto code completion feature automatically.
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How do I initialize the base (super) class?
...t(foo)
Because python knows about old- and new-style classes, there are different ways to invoke a base method, which is why you've found multiple ways of doing so.
For completeness sake, old-style classes call base methods explicitly using the base class, i.e.
def doit(self, foo):
return X.do...
In MySQL, how to copy the content of one table to another table within the same database?
...at w3school page is for a different SQL, not intended for MySQL. w3schools now has error reporting, if you find issues report it on their site to assist with accurate knowledge.
– Nightwolf
Sep 27 '17 at 10:50
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