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RuntimeWarning: invalid value encountered in divide
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157
I think your code is trying to "divide by zero" or "divide by NaN". If you are aware of that a...
Python argparse: default value or specified value
...rgparse.ArgumentParser()
parser.add_argument('--example', nargs='?', const=1, type=int)
args = parser.parse_args()
print(args)
% test.py
Namespace(example=None)
% test.py --example
Namespace(example=1)
% test.py --example 2
Namespace(example=2)
nargs='?' means 0-or-1 arguments
const=1 sets...
Map function in MATLAB?
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133
The short answer: the built-in function arrayfun does exactly what your map function does for ...
Turn Pandas Multi-Index into column
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197
The reset_index() is a pandas DataFrame method that will transfer index values into the DataFr...
Set markers for individual points on a line in Matplotlib
...For example, using a dashed line and blue circle markers:
plt.plot(range(10), linestyle='--', marker='o', color='b')
A shortcut call for the same thing:
plt.plot(range(10), '--bo')
Here is a list of the possible line and marker styles:
================ ===============================
c...
Extract substring using regexp in plain bash
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211
Using pure bash :
$ cat file.txt
US/Central - 10:26 PM (CST)
$ while read a b time x; do [[ $b...
Decreasing for loops in Python impossible?
...
for n in range(6,0,-1):
print n
# prints [6, 5, 4, 3, 2, 1]
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How to use a variable for the key part of a map
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169
Use this:
def map = [(A):1, (X):2]
For the value-part it's even easier, since there is no a...
How do I find if a string starts with another string in Ruby?
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edited Jan 11 '13 at 23:53
the Tin Man
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How to merge 2 JSON objects from 2 files using jq?
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165
Since 1.4 this is now possible with the * operator. When given two objects, it will merge them...