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How to sort a list of lists by a specific index of the inner list?
...;>> from operator import itemgetter
>>> L=[[0, 1, 'f'], [4, 2, 't'], [9, 4, 'afsd']]
>>> sorted(L, key=itemgetter(2))
[[9, 4, 'afsd'], [0, 1, 'f'], [4, 2, 't']]
It is also possible to use a lambda function here, however the lambda function is slower in this simple case
...
How to find time complexity of an algorithm
...de any simplifying constant factor.
For example, lets see how we simplify 2N + 2 machine instructions to describe this as just O(N).
Why do we remove the two 2s ?
We are interested in the performance of the algorithm as N becomes large.
Consider the two terms 2N and 2.
What is the relative inf...
efficient circular buffer?
...
206
I would use collections.deque with a maxlen arg
>>> import collections
>>> ...
Print all but the first three columns
...s",$i OFS; if(NF) printf "%s",$NF; printf ORS}'
### Example ###
$ echo '1 2 3 4 5 6 7' |
awk '{for(i=4;i<NF;i++)printf"%s",$i OFS;if(NF)printf"%s",$NF;printf ORS}' |
tr ' ' '-'
4-5-6-7
Sudo_O proposes an elegant improvement using the ternary operator NF?ORS:OFS
$ echo '1 2 3 4 5 6 7' |
...
java.net.ConnectException: localhost/127.0.0.1:8080 - Connection refused
...
292
Since you have not specified you are connected to a server from the device or emulator so I gu...
How to extract one column of a csv file
...
You could use awk for this. Change '$2' to the nth column you want.
awk -F "\"*,\"*" '{print $2}' textfile.csv
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Insert a row to pandas dataframe
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Just assign row to a particular index, using loc:
df.loc[-1] = [2, 3, 4] # adding a row
df.index = df.index + 1 # shifting index
df = df.sort_index() # sorting by index
And you get, as desired:
A B C
0 2 3 4
1 5 6 7
2 7 8 9
See in Pandas documentation Indexing: Se...
Focus Input Box On Load
...ction() {
var input = document.getElementById("myinputbox").focus();
}
2) How to place cursor at the end of the input text?
Here's a non-jQuery solution with some borrowed code from another SO answer.
function placeCursorAtEnd() {
if (this.setSelectionRange) {
// Double the length bec...
How to install GCC piece by piece with GMP, MPFR, MPC, ELF, without shared libraries?
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124
The Easy Way
If you're a typical developer, you can install the easy way, using instructions a...
What is the best regular expression to check if a string is a valid URL?
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