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Find element's index in pandas Series
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>>> myseries[myseries == 7]
3 7
dtype: int64
>>> myseries[myseries == 7].index[0]
3
Though I admit that there should be a better way to do that, but this at least avoids iterating and looping through the...
Appending to an empty DataFrame in Pandas?
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That should work:
>>> df = pd.DataFrame()
>>> data = pd.DataFrame({"A": range(3)})
>>> df.append(data)
A
0 0
1 1
2 2
But the append doesn't happen in-place, so you'll have to store the output if you want it:
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How do I compute derivative using Numpy?
... dydx will be computed using central differences and will have the same length as y, unlike numpy.diff, which uses forward differences and will return (n-1) size vector.
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How to define a two-dimensional array?
I want to define a two-dimensional array without an initialized length like this:
27 Answers
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Visual Studio or Resharper functionality for placement of using directives
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In ReSharper 6, this options is now at Code Editiong -> C# -> Namespace Imports (not under Formatting Style).
– CodingWithSpike
Feb 21 '12 at 15:57
1
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Correct way to remove plugin from Eclipse
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On latest eclipse versions there shortcut: Help->Installation details. No need to go to "About Eclipse" dialog.
– Fedir Tsapana
Oct 22 '14 at 11:30
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Node.js check if file exists
... return fs.promises.access(file, fs.constants.F_OK)
.then(() => true)
.catch(() => false)
}
An alternative for stat might be using the new fs.access(...):
minified short promise function for checking:
s => new Promise(r=>fs.access(s, fs.constants.F_OK, e => r(...
Count number of occurrences of a given substring in a string
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string.count(substring), like in:
>>> "abcdabcva".count("ab")
2
Update:
As pointed up in the comments, this is the way to do it for non overlapping occurrences. If you need to count overlapping occurrences, you'd better check the answers at: "Pytho...
Keyboard shortcuts are not active in Visual Studio with Resharper installed
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I would first try resetting all Visual Studio settings (Tools > Import and Export Settings > Reset all settings), then go to the Resharper > Options > Keyboard & Menus and re-apply the keyboard shortcut scheme.
I had to do something similar once.
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How do I get a list of all the duplicate items using pandas in python?
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Method #1: print all rows where the ID is one of the IDs in duplicated:
>>> import pandas as pd
>>> df = pd.read_csv("dup.csv")
>>> ids = df["ID"]
>>> df[ids.isin(ids[ids.duplicated()])].sort("ID")
ID ENROLLMENT_DATE TRAINER_MANAGING TRAINER...