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Iterate through pairs of items in a Python list [duplicate]
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From itertools receipes:
from itertools import tee
def pairwise(iterable):
"s -> (s0,s1), (s1,s2), (s2, s3), ..."
a, b = tee(iterable)
next(b, None)
return zip(a, b)
for v, w in pairwise(a):
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Reading a UTF8 CSV file with Python
... Does this mean the example in the python docs (where OP copy & pasted from) is wrong? What is the point of the extra encoding step it does if it breaks when you give it a unicode csv?
– Anentropic
Mar 6 '14 at 16:21
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Devise - How do I forbid certain users from signing in?
...og in."
end
I think that is quite important because the standard message from Devise says:
"Your account is not activated yet."
That is confusing for users and the real reason is that you have "banned" them from logging in.
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Ruby: Calling class method from instance
In Ruby, how do you call a class method from one of that class's instances? Say I have
9 Answers
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Returning null as an int permitted with ternary operator but not if statement
...ull reference, but that's not a problem). No Integer object is constructed from the null, so there's no reason for a NumberFormatException.
– Ted Hopp
Nov 15 '11 at 14:30
1
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How can you hide database output in Rails console?
In newer version of Rails, I'm guessing from 3 up, database queries are output to the console. This is useful most of the time, but how can you hide it when you do not want to see it?
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Why does “pip install” inside Python raise a SyntaxError?
I'm trying to use pip to install a package. I try to run pip install from the Python shell, but I get a SyntaxError . Why do I get this error? How do I use pip to install the package?
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Understanding how recursive functions work
...der to understand recursion, you must first understand recursion." replies from various online threads I still am not quite getting it.
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How do I fix PyDev “Undefined variable from import” errors?
... -> Editor -> Code Analysis -> Undefined -> Undefined Variable From Import -> Ignore
And that's that.
It may also be,
Window -> Preferences -> PyDev -> Editor -> Code Analysis -> Imports -> Import not found -> Ignore
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R: += (plus equals) and ++ (plus plus) equivalent from c++/c#/java, etc.?
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These functions appear to have been removed from Hmisc as of version 4.1.0.
– llasram
Mar 7 '18 at 15:13
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