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What's the meaning of “=>” (an arrow formed from equals & greater than) in JavaScript?
...g functions. They are one-liners, similar to Lambda Expressions in Java or Python.
Example with no parameters
const queue = ['Dave', 'Sarah', 'Sharon'];
const nextCustomer = () => queue[0];
console.log(nextCustomer()); // 'Dave'
If multiple statements need to be made within the same Ar...
Inject errors into already validated form?
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This is incredibly non pythonic. How hard was it to implement form.errors['myfield'].append(my_error) or form.add_error('myfield', my_error)? To much room for error (no pun intended) in current implementation.
– Michael
...
Regular expression: find spaces (tabs/space) but not newlines
...included in \s for any implementation I've tried so far (Perl, .NET, PCRE, Python). You'll need to either normalize your strings first (such as by replacing all \u3000 with \u0020), or you'll have to use a character set that includes this codepoint in addition to whatever other whitespace you're ta...
ElasticSearch, Sphinx, Lucene, Solr, Xapian. Which fits for which usage? [closed]
...huge SQL query.
I saw elasticsearch recently and played with whoosh (a Python implementation of a search engine).
9 Ans...
Easy way to pull latest of all git submodules
...Update 2:
If you are on a windows platform, you may want to look at using Python to implement the script as it is very capable in these areas. If you are on unix/linux, then I suggest just a bash script.
Need any clarifications? Just post a comment.
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Send message to specific client with socket.io and node.js
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I am Python/PHP programmer and I am new to sockets and node, question is, why do we need to increment seq number of same user each second? is that just for demo?
– Umair Ayub
Sep 11 '18 at 10...
Is there a reason for C#'s reuse of the variable in a foreach?
...en moment in time (creation of a closure). This discusses similar stuff in Python and Scheme (cut for refs/vars and cute for keeping evaluated values in partially-evaluated closures).
– Will Ness
Jan 18 '12 at 18:09
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Replace None with NaN in pandas dataframe
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You can use DataFrame.fillna or Series.fillna which will replace the Python object None, not the string 'None'.
import pandas as pd
import numpy as np
For dataframe:
df = df.fillna(value=np.nan)
For column or series:
df.mycol.fillna(value=np.nan, inplace=True)
...
How do I create a directory from within Emacs?
...t create nonexistent parent directories.
Example:
C-x d *.py RET ; shows python source files in the CWD in `Dired` mode
+ test RET ; create `test` directory in the CWD
CWD stands for Current Working Directory.
or just create a new file with non-existing parent directories using C-x C-f and t...
How to round the minute of a datetime object
...verflow.com/questions/3463930/how-to-round-the-minute-of-a-datetime-object-python
"""
round_to = date_delta.total_seconds()
if dt is None:
dt = datetime.now()
seconds = (dt - dt.min).seconds
if seconds % round_to == 0 and dt.microsecond == 0:
rounding = (seconds ...