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ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.al
...in boolean context (by
calling __bool__ in Python3 or __nonzero__ in Python2).
Your original code
mask = ((r["dt"] >= startdate) & (r["dt"] <= enddate))
selected = r[mask]
looks correct. However, if you do want and, then instead of a and b use (a-b).any() or (a-b).all().
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Is there a method to generate a UUID with go language
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12 Answers
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How to check whether a variable is a class or not?
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>>> x = X()
>>> isinstance(x, X)
True
>>> y = 25
>>> isinstance(y, X)
False
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How to write to a file in Scala?
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Edit 2019 (8 years later), Scala-IO being not very active, if any, Li Haoyi suggests his own library lihaoyi/os-lib, that he presents below.
June 2019, Xavier Guihot mentions in his answer the library Using, a utility for perform...
mongodb count num of distinct values per field/key
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answered Feb 18 '13 at 2:43
StennieStennie
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OS X Terminal Colors [closed]
...en the Text subtab and check Display ANSI Colors.
Verified on Sierra (May 2017).
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Hg: How to do a rebase like git's rebase
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233
VonC has the answer you're looking for, the Rebase Extension. It is, however, worth spending ...
Verify a certificate chain using openssl verify
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edited Jul 23 at 22:40
Eddie C.
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answered Oct 23 '14...
How to install plugin for Eclipse from .zip
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223
It depends on what the zip contains. Take a look to see if it got content.jar and artifacts.ja...
Getting hold of the outer class object from the inner class object
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edited Feb 10 '18 at 22:34
jihor
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answered Nov 29 '09 at 1...