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Numpy first occurrence of value greater than existing value
.... Consider the test case of N being odd (and N/2.0 to force float if using python 2).
– askewchan
Feb 11 '17 at 1:25
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Multiple aggregations of the same column using pandas GroupBy.agg()
... 34.0 6.0
Lastly, if your column names aren't valid python identifiers, use a dictionary with unpacking:
df.groupby('kind')['height'].agg(**{'max height': 'max', ...})
Pandas < 0.25
In more recent versions of pandas leading upto 0.24, if using a dictionary for specify...
Why shouldn't I use “Hungarian Notation”?
...er's job also, but that would incur a huge overhead for dynamic languages (Python, Ruby, PHP or Javascript).
– too much php
Dec 29 '08 at 3:45
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Truly understanding the difference between procedural and functional
... style there is pretty hard to read compared the the "functional style" in python: def odd_words(words): return [x for x in words if odd(len(x))]
– boxed
Dec 12 '13 at 9:11
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What is the difference between related SQLite data-types like INT, INTEGER, SMALLINT and TINYINT?
...'t have to handle such non-zero numeric fields specially. An example using Python's sqlite3 module would be,
conn_or_cursor.execute(
"INSERT INTO table VALUES (" + ",".join("?" * num_values) + ")",
str_value_tuple) # no need to convert some from str to int/float
In the above example, ...
Rename specific column(s) in pandas
...lse x, axis=1)
Index.str.replace
Similar to replace method of strings in python, pandas Index and Series (object dtype only) define a ("vectorized") str.replace method for string and regex-based replacement.
df.columns = df.columns.str.replace('gdp', 'log(gdp)')
df
y log(gdp) cap
0 x ...
How can I parse a CSV string with JavaScript, which contains comma in data?
... are first presented in native regular expressions syntax (expressed using Python's handy r'''...''' raw-multi-line-string syntax).
First here is a regular expression which validates that a CVS string meets the above requirements:
Regular expression to validate a "CSV string":
re_valid = r"""
# Vali...
How to create the most compact mapping n → isprime(n) up to a limit N?
...orithm I usually implement (easy to understand and code) is as follows (in Python):
def isprime(n):
"""Returns True if n is prime."""
if n == 2:
return True
if n == 3:
return True
if n % 2 == 0:
return False
if n % 3 == 0:
return False
i = 5
...
Is it possible to specify your own distance function using scikit-learn K-Means Clustering?
... enough);
in particular, what are your N, dim, k, metric ?
#!/usr/bin/env python
# kmeans.py using any of the 20-odd metrics in scipy.spatial.distance
# kmeanssample 2 pass, first sample sqrt(N)
from __future__ import division
import random
import numpy as np
from scipy.spatial.distance import cdi...
Can I mask an input text in a bat file?
... the command line. For example, you can replace the cscript section with: 'python -c "from getpass import getpass; pwd = getpass(); print pwd;"'
– Cerin
Jul 30 '10 at 17:15
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