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Remove the last line from a file in Bash
...ter without dd. I was terrified of using dd as a single misplaced digit or letter can spell disaster.. +1
– Yossi Farjoun
Jun 12 '16 at 5:30
1
...
What does “SyntaxError: Missing parentheses in call to 'print'” mean in Python?
... to print" case is a compile time syntax error and hence has access to the raw source code, it's able to include the full text on the rest of the line in the suggested replacement. However, it doesn't currently try to work out the appropriate quotes to place around that expression (that's not imposs...
Using pickle.dump - TypeError: must be str, not bytes
...ile_object.write(serialized)
with open(filename,'rb') as file_object:
raw_data = file_object.read()
deserialized = pickle.loads(raw_data)
print("Loading from serialized file: ")
user2 = deserialized
print(user2.name)
print("------------")
...
Regular Expressions: Is there an AND operator?
...e specified with a pipe.
The following RegExp:
var re = /ab/;
means the letter a AND the letter b.
It also works with groups:
var re = /(co)(de)/;
it means the group co AND the group de.
Replacing the (implicit) AND with an OR would require the following lines:
var re = /a|b/;
var re = /(co)|...
Case-insensitive string comparison in C++ [closed]
...e not binary equal.
Example:
U212B (ANGSTROM SIGN)
U0041 (LATIN CAPITAL LETTER A) + U030A (COMBINING RING ABOVE)
U00C5 (LATIN CAPITAL LETTER A WITH RING ABOVE).
Are all equivalent but they also have different binary representations.
That said, Unicode Normalization should be a mandatory read e...
Why is iterating through a large Django QuerySet consuming massive amounts of memory?
... Thanks for the great answer, @eternicode. In the end we dropped down to raw SQL for the desired database-level iteration.
– davidchambers
Aug 13 '11 at 21:15
2
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Best way to store JSON in an HTML attribute?
... it was in PHP? — You're setting attributes of DOM nodes, not generating raw HTML, the browser will take care of it.
– Quentin
Sep 6 '11 at 16:03
...
What is float in Java?
... A floating-point literal is of type float if it is suffixed with an ASCII letter F or f; otherwise its type is double and it can optionally be suffixed with an ASCII letter D or d
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Convert column classes in data.table
..., you can use for(...)set(...).
library(data.table)
DT = data.table(a = LETTERS[c(3L,1:3)], b = 4:7, c = letters[1:4])
DT1 <- copy(DT)
names_factors <- c("a", "c")
for(col in names_factors)
set(DT, j = col, value = as.factor(DT[[col]]))
sapply(DT, class)
#> a b ...
How to change to an older version of Node.js
... Node Version Manager.
Use following command to get nvm
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.34.0/install.sh | bash
You can find it at https://github.com/creationix/nvm
It allows you to easily install and manage multiple versions of node. Here's a snippet from the help:...