大约有 48,000 项符合查询结果（耗时：0.0690秒） [XML]
Failed loading english.pickle with nltk.data.load
...
I had this same problem. Go into a python shell and type:
>>> import nltk
>>> nltk.download()
Then an installation window appears. Go to the 'Models' tab and select 'punkt' from under the 'Identifier' column. Then click Download and it will install the...
Convert list of dictionaries to a pandas DataFrame
...
As of Pandas 0.19.2, there's no mention of this in the documentation, at least not in the docs for pandas.DataFrame
– Leo Alekseyev
Apr 13 '17 at 22:56
...
Hidden Features of C++? [closed]
... that it can be used as an lvalue:
(a == 0 ? a : b) = 1;
which is shorthand for
if (a == 0)
a = 1;
else
b = 1;
Use with caution :-)
share
edited Jan 7 '09 at 21:...
Dynamic variable names in Bash
...
Use an associative array, with command names as keys.
# Requires bash 4, though
declare -A magic_variable=()
function grep_search() {
magic_variable[$1]=$( ls | tail -1 )
echo ${magic_variable[$1]}
}
If you can't use associative arrays (e.g., you m...
Extract a substring according to a pattern
...we create a data frame with two columns, one for the part before the colon and one for after, and then extract the latter.
library(dplyr)
library(tidyr)
library(purrr)
DF <- data.frame(string)
DF %>%
separate(string, into = c("pre", "post")) %>%
pull("post")
## [1] "E001" "E002" "E00...
Build a Basic Python Iterator
...ator protocol, which basically means they provide two methods: __iter__() and __next__().
The __iter__ returns the iterator object and is implicitly called
at the start of loops.
The __next__() method returns the next value and is implicitly called at each loop increment. This method raises a...
Is JSON Hijacking still an issue in modern browsers?
I am using Backbone.js and the Tornado web server. The standard behavior for receiving collection data in Backbone is to send as a JSON Array.
...
difference between Product Backlog Item and Feature in Team Foundation work item types
... of work item types to select from, among which are "Product Backlog Item" and "Feature".
7 Answers
...
Java Singleton and Synchronization
Please clarify my queries regarding Singleton and Multithreading:
8 Answers
8
...
Iterator Loop vs index loop [duplicate]
I'm reviewing my knowledge on C++ and I've stumbled upon iterators. One thing I want to know is what makes them so special and I want to know why this:
...