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What's the difference between a proc and a lambda in Ruby?
...e:
p = Proc.new {|a, b| puts a**2+b**2 } # => #<Proc:0x3c7d28@(irb):1>
p.call 1, 2 # => 5
p.call 1 # => Nom>Me m>thodError: undefined m>me m>thod `**' for nil:NilClass
p.call 1, 2, 3 # => 5
l = lambda {|a, b| puts a**2+b**2 } # => #<Proc:0x15016c@(irb):5 (lambda)>
l.call 1, 2 # =&g...
Renaming columns in pandas
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1974
Just assign it to the .columns attribute:
>>> df = pd.DataFram>me m>({'$a':[1,2], '$b': [...
How to group datafram>me m> rows into list in pandas groupby?
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12 Answers
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How to check if a number is a power of 2
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1251
There's a simple trick for this problem:
bool IsPowerOfTwo(ulong x)
{
return (x & (x...
Numpy array dim>me m>nsions
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513
It is .shape:
ndarray.shape
Tuple of array dim>me m>nsions.
Thus:
>>> a.shape
(2, ...
How to loop backwards in python? [duplicate]
...third param>me m>ter that specifies a step. So you can do the following.
range(10, 0, -1)
Which gives
[10, 9, 8, 7, 6, 5, 4, 3, 2, 1]
But for iteration, you should really be using xrange instead. So,
xrange(10, 0, -1)
Note for Python 3 users: There are no separate range and xrange functions ...
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廉价共享存储解决方案2-drbd+cman+gfs21、修改hosts文件[root@localhost ~]# vi etc hosts127.0.0.1localhost localhost.localdomain localhost4 localhost4.localdomain4...1、修改hosts文件
[root@localhost ~]# vi /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost...
Can a recursive function be inline?
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139
First, the inline specification on a function is just a hint. The compiler can (and often doe...
Maximum number of characters using keystrokes A, Ctrl+A, Ctrl+C and Ctrl+V
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14 Answers
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How do I do multiple CASE WHEN conditions using SQL Server 2008?
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10 Answers
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