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Is there a way to perform “if” in python's lambda
In python 2.6 , I want to do:
16 Answers
16
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Why doesn't Python have a sign function?
I can't understand why Python doesn't have a sign function. It has an abs builtin (which I consider sign 's sister), but no sign .
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Truncating floats in Python
....partition('.')
return '.'.join([i, (d+'0'*n)[:n]])
This is valid in Python 2.7 and 3.1+. For older versions, it's not possible to get the same "intelligent rounding" effect (at least, not without a lot of complicated code), but rounding to 12 decimal places before truncation will work much of...
Convert python datetime to epoch with strftime
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If you want to convert a python datetime to seconds since epoch you could do it explicitly:
>>> (datetime.datetime(2012,04,01,0,0) - datetime.datetime(1970,1,1)).total_seconds()
1333238400.0
In Python 3.3+ you can use timestamp() instead:...
Get: TypeError: 'dict_values' object does not support indexing when using python 3.2.3 [duplicate]
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In Python 3, dict.values() (along with dict.keys() and dict.items()) returns a view, rather than a list. See the documentation here. You therefore need to wrap your call to dict.values() in a call to list like so:
v = list(d.va...
How to recursively download a folder via FTP on Linux [closed]
I'm trying to ftp a folder using the command line ftp client, but so far I've only been able to use 'get' to get individual files.
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How do I use method overloading in Python?
I am trying to implement method overloading in Python:
15 Answers
15
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Python `if x is not None` or `if not x is None`?
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There's no performance difference, as they compile to the same bytecode:
Python 2.6.2 (r262:71600, Apr 15 2009, 07:20:39)
>>> import dis
>>> def f(x):
... return x is not None
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>>> dis.dis(f)
2 0 LOAD_FAST 0 (x)
3 LOAD_CONST...
What happens to an open file handle on Linux if the pointed file gets moved or deleted
What happens to an open file handle on Linux if the pointed file meanwhile gets:
7 Answers
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Python Graph Library [closed]
I'm writing a python application that will make heavy use of a graph data structure. Nothing horribly complex, but I'm thinking some sort of graph/graph-algorithms library would help me out. I've googled around, but I don't find anything that particularly leaps out at me.
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