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Pandas - How to flatten a hierarchical index in columns
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edited Jan 17 '14 at 19:36
answered Jan 24 '13 at 18:37
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Is there a NumPy function to return the first index of something in an array?
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13 Answers
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List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
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3446
With new_list = my_list, you don't actually have two lists. The assignment just copies the re...
Gmail Error :The SMTP server requires a secure connection or the client was not authenticated. The s
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203
This generally happens when you try login from different time zone or IP Address Computer. Your ...
When is SQLiteOpenHelper onCreate() / onUpgrade() run?
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SQLiteOpenHelper onCreate() and onUpgrade() callbacks are invoked when the database is actuall...
Python element-wise tuple operations like sum
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import operator
tuple(map(operator.add, a, b))
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What is the best way to convert an array to a hash in Ruby
...y keys or values!
Building on @John Topley's popular answer, let's try:
a3 = [ ['apple', 1], ['banana', 2], [['orange','seedless'], 3] ]
h3 = Hash[*a3.flatten]
This throws an error:
ArgumentError: odd number of arguments for Hash
from (irb):10:in `[]'
from (irb):10
The constru...
How do I save and restore multiple variables in python?
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# Saving the objects:
with open('objs.pkl', 'w') as f: # Python 3: open(..., 'wb')
pickle.dump([obj0, obj1, obj2], f)
# Getting back the objects:
with open('objs.pkl') as f: # Python 3: open(..., 'rb')
obj0, obj1, obj2 = pickle.load(f)
If you have a lot of data, you can reduce...
Simple basic explanation of a Distributed Hash Table (DHT)
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3 Answers
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When to use os.name, sys.platform, or platform.system?
As far as I know, Python has 3 ways of finding out what operating system is running on:
5 Answers
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