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How can I check if my python object is a number? [duplicate]
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276
Test if your variable is an instance of numbers.Number:
>>> import numbers
>>&...
Android Studio Stuck at Gradle Download on create new project
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edited Oct 30 '14 at 7:32
user3666197
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answered...
What is the significance of initializing direction arrays below with given values when developing ch
...what move each index of the arrays will make from the central point, X, at 2,2.)
.....
.536.
.1X0.
.724.
.....
The way it is set up, if you do ^1 (^ being bitwise XOR) on the index you get the opposite direction - 0 and 1 are opposites, 2 and 3 are opposites and so on. (Another way to set it up i...
How to add an integer to each element in a list?
If I have list=[1,2,3] and I want to add 1 to each element to get the output [2,3,4] ,
how would I do that?
11 Answers...
How do I determine if my python shell is executing in 32bit or 64bit?
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424
One way is to look at sys.maxsize as documented here:
$ python-32 -c 'import sys;print("%x" % ...
What's the fastest way to merge/join data.frames in R?
...s for duplicate keys. (continued after code)
DF1 = data.frame(a = c(1, 1, 2, 2), b = 1:4)
DF2 = data.frame(b = c(1, 2, 3, 3, 4), c = letters[1:5])
merge(DF1, DF2)
b a c
1 1 1 a
2 2 1 b
3 3 2 c
4 3 2 d
5 4 2 e
DF1$c = DF2$c[match(DF1$b, DF2$b)]
DF1$c
[1] a b c e
Levels: a b c d e
>...
浅析为什么char类型的范围是 -128~+127 - C/C++ - 清泛网 - 专注C/C++及内核技术
浅析为什么char类型的范围是 -128~+127在C语言中， signed char 类型的范围为-128~127,每本教科书上也这么写，但是没有哪一本书上（包括老师）也不会给你为什么是-128~127，这...在C语言中， signed char 类型的范围为-128~127,每本教科书上...
[] and {} vs list() and dict(), which is better?
...>>> from timeit import timeit
>>> timeit("[]")
0.040084982867934334
>>> timeit("list()")
0.17704233359267718
>>> timeit("{}")
0.033620194745424214
>>> timeit("dict()")
0.1821558326547077
and for non-empty:
>>> timeit("[1,2,3]")
0.2431630277033...
How to upgrade Git on Windows to the latest version?
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Since Git 2.16.1(2) you can use
C:\> git update-git-for-windows
In versions between 2.14.2 and 2.16.1, the command was
C:\> git update
(It was later renamed to avoid confusion with updating the local repository, e.g. like s...