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What is the difference between the dot (.) operator and -> in C++? [duplicate]
...force this with parenthesis:
(*pointervariable).foo
But typing the ()'s all the time is hard, so they developed -> as a shortcut to say the same thing. If you are accessing a property of an object or object reference, use . If you are accessing a property of an object through a pointer, use -...
Execute stored procedure with an Output parameter?
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I know all other possible ways to execute stored procedure(like EXEC , calling from C# or PHP) but this is the easiest and a non technical person can do this. so +1 for this and thx for sharing the information.
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Make UINavigationBar transparent
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Undoing the effect for me only partially works. Because after I do this, my tableviews all have headers that are too large. App-wide, which is weird. (I only want this effect for one controller that I push on the stack.)
– Henning
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How do I get an empty array of any size in python?
I basically want a python equivalent of this in C:
8 Answers
8
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Pandas DataFrame Groupby two columns and get counts
...er,
You need to provide one more column which counts the grouping, let's call that column as, "COUNTER" in dataframe.
Like this:
df['COUNTER'] =1 #initially, set that counter to 1.
group_data = df.groupby(['Alphabet','Words'])['COUNTER'].sum() #sum function
print(group_data)
OUTPUT:
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How to print like printf in Python3?
... inline interpolation. What's even nicer is it extended the syntax to also allow format specifiers with interpolation. Something I've been working on while I googled this (and came across this old question!):
print(f'{account:40s} ({ratio:3.2f}) -> AUD {splitAmount}')
PEP 498 has the details. ...
Determine the number of NA values in a column
...nt the number of NA values in a data frame column. Say my data frame is called df , and the name of the column I am considering is col . The way I have come up with is following:
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Rails 3 migrations: Adding reference column?
...d:
rails g migration add_user_id_to_tester user_id:integer
And then manually add belongs_to :user in the Tester model
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How to set the UITableView Section title programmatically (iPhone/iPad)?
... answered May 8 '12 at 20:27
AlladinianAlladinian
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UnmodifiableMap (Java Collections) vs ImmutableMap (Google) [duplicate]
...// Will return "F".
In contrast to that, the ImmutableMap of Guava is really immutable: It is a true copy of a given map, and nobody may modify this ImmutableMap in any way.
Update:
As pointed out in a comment, an immutable map can also be created with the standard API using
Map<String, S...