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Python list subtraction operation
...is a "set subtraction" operation. Use the set data structure for that.
In Python 2.7:
x = {1,2,3,4,5,6,7,8,9,0}
y = {1,3,5,7,9}
print x - y
Output:
>>> print x - y
set([0, 8, 2, 4, 6])
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Removing multiple keys from a dictionary safely
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This. This is the clever Pythonista's choice. dict.pop() eliminates the need for key existence testing. Excellent.
– Cecil Curry
Mar 11 '16 at 1:51
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Converting dict to OrderedDict
... having some trouble using the collections.OrderedDict class. I am using Python 2.7 on Raspbian, the Debian distro for Raspberry Pi. I am trying to print two dictionaries in order for comparison (side-by-side) for a text-adventure. The order is essential to compare accurately.
No matter what I try...
How do I design a class in Python?
...llowing advices (similar to @S.Lott's advice) are from the book, Beginning Python: From Novice to Professional
Write down a description of your problem (what should the problem do?). Underline all the nouns, verbs, and adjectives.
Go through the nouns, looking for potential classes.
Go th...
How to provide animation when calling another activity in Android?
...and maximize animation when Activity B calls A. I don't need the animation xml files for this.
4 Answers
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Conditional Replace Pandas
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yield error: /opt/anaconda3/envs/python35/lib/python3.5/site-packages/ipykernel_launcher.py:1: SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame See the caveats in the documentation: pandas.pydata.org/pandas-docs/sta...
How to map a composite key with JPA and Hibernate?
...ll use the <composite-id ...>...</composite-id> tag in the hbm.xml mapping file. So the PurchasedTest.hbm.xml will look like:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-ma...
Shell command to sum integers, one per line?
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The one-liner version in Python:
$ python -c "import sys; print(sum(int(l) for l in sys.stdin))"
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Scatter plot and Color mapping in Python
...ackoverflow.com%2fquestions%2f17682216%2fscatter-plot-and-color-mapping-in-python%23new-answer', 'question_page');
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Android Studio: Android Manifest doesn't exists or has incorrect root tag
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Moving my AndroidManifest.xml to PROJECT_NAME/src/main fixed the issue.
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