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Find first element in a sequence that matches a predicate
...redicate:
next(x for x in seq if predicate(x))
Or (itertools.ifilter on Python 2):
next(filter(predicate, seq))
It raises StopIteration if there is none.
To return None if there is no such element:
next((x for x in seq if predicate(x)), None)
Or:
next(filter(predicate, seq), None)
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How to retrieve inserted id after inserting row in SQLite using Python?
How to retrieve inserted id after inserting row in SQLite using Python? I have table like this:
2 Answers
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Why does python use 'else' after for and while loops?
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It's a strange construct even to seasoned Python coders. When used in conjunction with for-loops it basically means "find some item in the iterable, else if none was found do ...". As in:
found_obj = None
for obj in objects:
if obj.key == search_key:
fou...
Clear variable in python
Is there a way to clear the value of a variable in python?
7 Answers
7
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How to log source file name and line number in Python
Is it possible to decorate/extend the python standard logging system, so that when a logging method is invoked it also logs the file and the line number where it was invoked or maybe the method that invoked it?
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Convert base-2 binary number string to int
...y number:
>>> int('11111111', 2)
255
Here is documentation for python2, and for python3.
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Elegant setup of Python logging in Django
I have yet to find a way of setting up Python logging with Django that I'm happy with. My requirements are fairly simple:
4...
Is the list of Python reserved words and builtins available in a library?
Is the list of Python reserved words and builtins available in a library? I want to do something like:
1 Answer
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How can I check if a string represents an int, without using try/except?
...lse
It's going to be WAY more code to exactly cover all the strings that Python considers integers. I say just be pythonic on this one.
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Is there a builtin identity function in python?
... it to take multiple arguments. That's fine, but then you hit a problem as Python functions don't return multiple results, so you have to find a way of cramming all of those arguments into one return value.
The usual way of returning "multiple values" in Python is to return a tuple of the values - ...