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Python pandas: fill a dataframe row by row
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Accessing elements of Python dictionary by index
...bout the order, then you might consider using an OrderedDict:
http://docs.python.org/dev/library/collections.html#collections.OrderedDict
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Python set to list
How can I convert a set to a list in Python? Using
7 Answers
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Checking if a string can be converted to float in Python
I've got some Python code that runs through a list of strings and converts them to integers or floating point numbers if possible. Doing this for integers is pretty easy
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Convert Year/Month/Day to Day of Year in Python
I'm using the Python datetime module, i.e.:
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High performance fuzzy string comparison in Python, use Levenshtein or difflib [closed]
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Logical operators for boolean indexing in Pandas
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When you say
(a['x']==1) and (a['y']==10)
You are implicitly asking Python to convert (a['x']==1) and (a['y']==10) to boolean values.
NumPy arrays (of length greater than 1) and Pandas objects such as Series do not have a boolean value -- in other words, they raise
ValueError: The truth v...
How to replace multiple substrings of a string?
...he replacement
rep = dict((re.escape(k), v) for k, v in rep.iteritems())
#Python 3 renamed dict.iteritems to dict.items so use rep.items() for latest versions
pattern = re.compile("|".join(rep.keys()))
text = pattern.sub(lambda m: rep[re.escape(m.group(0))], text)
For example:
>>> patte...
How to create a density plot in matplotlib?
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@Justin Nice answer (+1) and not wanting to start any Python v R flame wars or anything, but I am loving the way R works with data much more succinctly that python and other languages. I'm sure python has lots of good points over R (I'm not a Python user so I'm so totally unifor...
How to properly use unit-testing's assertRaises() with NoneType objects? [duplicate]
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If you are using python2.7 or above you can use the ability of assertRaises to be use as a context manager and do:
with self.assertRaises(TypeError):
self.testListNone[:1]
If you are using python2.6 another way beside the one given unt...