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Is False == 0 and True == 1 an implementation detail or is it guaranteed by the language?
...ill always produce the same results, whatever the version of Python (both existing and, likely, future ones)?
6 Answers
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Remove trailing newline from the elements of a string list
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Be aware of the following: If you are using Python 3.x and you want to return a list, you have to list, so that it's list(map(str.strip, my_list)). Also check that out: link.
– So S
Dec 1 '15 at 21:31
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What are the relationships between Any, AnyVal, AnyRef, Object and how do they map when used in Java
I usually end up trying every combination until it compiles. Can somebody explain what I should use where?
3 Answers
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Convert string to integer type in Go?
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For example,
package main
import (
"flag"
"fmt"
"os"
"strconv"
)
func main() {
flag.Parse()
s := flag.Arg(0)
// string to int
i, err := strconv.Atoi(s)
if err != nil {
// handle error...
JavaScript, elegant way to check nested object properties for null/undefined [duplicate]
...urse of using the app this gets populated. Let's say somwhere, after an AJAX call or something i do this:
4 Answers
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Is there any particular difference between intval and casting to int - `(int) X`?
...) can be passed a base from which to convert. (int) cannot.
int intval( mixed $var [, int $base = 10 ] )
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Ruby: How to iterate over a range, but in set increments?
...html#M000695 for the full API.
Basically you use the step() method. For example:
(10..100).step(10) do |n|
# n = 10
# n = 20
# n = 30
# ...
end
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Setting environment variables via launchd.conf no longer works in OS X Yosemite/El Capitan/macOS Sie
...environment.plist file in ~/Library/LaunchAgents/ with this content:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
&l...
Fastest way to replace NAs in a large data.table
...alue=0) { v[is.na(v)] = value; v }
for (i in names(dt))
eval(parse(text=paste("dt[,",i,":=na.replace(",i,")]")))
}
system.time(a_gdata = f_gdata(dt1))
user system elapsed
18.805 12.301 134.985
system.time(a_andrie = f_andrie(dt1))
Error: cannot allocate vector of size 305.2 Mb
Timin...
C++ deprecated conversion from string constant to 'char*'
...conversion from const char* to char* is generally not possible without an explicit cast for safety reasons. But for backwards compatibility with C the language C++ still allows assigning a string literal to a char* and gives you a warning about this conversion being deprecated.
So, somewhere you ar...