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How can I show hidden files (starting with period) in NERDTree?
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Press I (Shift+i) to toggle hidden files in the NERDTree explorer window.
To enable this behavior by default, add this line to your .vimrc file:
let NERDTreeShowHidden=1
For more detail, access the NERDTree help file :help NERD_tree.txt and search for "hidden".
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Hash and salt passwords in C#
...was just going through one of DavidHayden's articles on Hashing User Passwords .
14 Answers
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Pandas dataframe get first row of each group
... 4 second
4 5 first
5 6 first
6 7 fourth
To get n first records, you can use head():
>>> df.groupby('id').head(2).reset_index(drop=True)
id value
0 1 first
1 1 second
2 2 first
3 2 second
4 3 first
5 3 third
6 4 second
7 4 fifth
8 ...
How to prevent browser page caching in Rails
...er Rails 5:
class ApplicationController < ActionController::Base
before_action :set_cache_headers
private
def set_cache_headers
response.headers["Cache-Control"] = "no-cache, no-store"
response.headers["Pragma"] = "no-cache"
response.headers["Expires"] = "Mon, 01 Jan 1990 00...
What is the rationale behind having companion objects in Scala?
Is there a case where a companion object (singleton) for a class is needed? Why would I want to create a class, say Foo and also create a companion object for it?
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Override valueof() and toString() in Java enum
The values in my enum are words that need to have spaces in them, but enums can't have spaces in their values so it's all bunched up. I want to override toString() to add these spaces where I tell it to.
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How to get different colored lines for different plots in a single figure?
...lib to create the plots. I have to identify each plot with a different color which should be automatically generated by Python.
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Why is early return slower than else?
...en't figured out an easy way to check whether it is right, but I have a theory for you.
I tried your code and get the same of results, without_else() is repeatedly slightly slower than with_else():
>>> T(lambda : without_else()).repeat()
[0.42015745017874906, 0.3188967452567226, 0.3198428...
correct way to use super (argument passing)
...in common. In that case, you can't pop the key-value pairs off of **kwargs or remove them from *args. Instead, you can define a Base class which unlike object, absorbs/ignores arguments:
class Base(object):
def __init__(self, *args, **kwargs): pass
class A(Base):
def __init__(self, *args, ...
Opposite of String.Split with separators (.net)
....Net? That is, to combine all the elements of an array with a given separator.
2 Answers
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