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undefined method `source_index' for Gem:Module (NoMethodError)
...to this problem myself while trying to upgrade an older Rails app from REE 1.8.7 to 1.9.3-p385. Oddly, Ruby 1.9.3-p327 works just fine. What it came down to was ruby-1.9.3-p385 had installed RubyGems version 2.0.2 for me, and 1.9.3-p327 has RubyGems v1.8.23 installed.
Gem.source_index has been depr...
Is there a builtin identity function in python?
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100
Doing some more research, there is none, a feature was asked in issue 1673203 And from Raymond...
Convert decimal to binary in python [duplicate]
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231
all numbers are stored in binary. if you want a textual representation of a given number in bina...
Disable a group of tests in rspec?
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169
To disable a tree of specs using RSpec 3 you can:
before { skip }
# or
xdescribe
# or
xcont...
Pandas - Get first row value of a given column
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516
To select the ith row, use iloc:
In [31]: df_test.iloc[0]
Out[31]:
ATime 1.2
X 2....
Javascript calculate the day of the year (1 - 366)
How do I use javascript to calculate the day of the year, from 1 - 366? For example:
22 Answers
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Understanding how recursive functions work
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18 Answers
18
Active
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Find column whose name contains a specific string
...list of column names that match:
import pandas as pd
data = {'spike-2': [1,2,3], 'hey spke': [4,5,6], 'spiked-in': [7,8,9], 'no': [10,11,12]}
df = pd.DataFrame(data)
spike_cols = [col for col in df.columns if 'spike' in col]
print(list(df.columns))
print(spike_cols)
Output:
['hey spke', 'no', ...
Converting camel case to underscore case in ruby
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11 Answers
11
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Meaning of numbers in “col-md-4”,“ col-xs-1”, “col-lg-2” in Bootstrap
...s, sm, md, lg) for now, I'll start with just the numbers...
the numbers (1-12) represent a portion of the total width of any div
all divs are divided into 12 columns
so, col-*-6 spans 6 of 12 columns (half the width), col-*-12 spans 12 of 12 columns (the entire width), etc
So, if you want two eq...