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python Programming Glossary: avoidsIn Python, how do I determine if an object is iterable? http://stackoverflow.com/questions/1952464/in-python-how-do-i-determine-if-an-object-is-iterable by allowing polymorphic substitution. Duck typing avoids tests using type or isinstance . Instead it typically employs..
counting combinations and permutations efficiently http://stackoverflow.com/questions/2096573/counting-combinations-and-permutations-efficiently I've found a better algorithm for permutations that avoids large intermediate results but I still think I can do better.. of nCr but I'd still like to find a better algorithm that avoids the call to factorial r which is an unnecessarily large intermediate..
http://stackoverflow.com/questions/233673/lexical-closures-in-python for f in flist print f 2 Note that this example mindfully avoids lambda . It prints 4 4 4 which is surprising. I'd expect 0 2..
How can I read all availably data from subprocess.Popen.stdout (non blocking)? http://stackoverflow.com/questions/3076542/how-can-i-read-all-availably-data-from-subprocess-popen-stdout-non-blocking really nice solution Persistent python subprocess which avoids the blocking issue all together by using fcntl to set file attributes..
How are Python's Built In Dictionaries Implemented http://stackoverflow.com/questions/327311/how-are-pythons-built-in-dictionaries-implemented the dict will be resized if it is two thirds full. This avoids slowing down lookups. see dictobject.h 64 65 NOTE I did the..
How to escape os.system() calls in Python? http://stackoverflow.com/questions/35817/how-to-escape-os-system-calls-in-python before passing it to the program in question. Notably this avoids problems with filenames that contain spaces or any other kind..
Why does 0.1+0.1+0.1-0.3 results in 5.55111512313e-17? [duplicate] http://stackoverflow.com/questions/3676894/why-does-0-10-10-1-0-3-results-in-5-55111512313e-17 type is not implemented using a C double and instead avoids hardware based binary floating point arithmetic in order to..
Merge SQLite files into one db file, and 'begin/commit' question http://stackoverflow.com/questions/3689694/merge-sqlite-files-into-one-db-file-and-begin-commit-question it's cmd attach as toMerge cursor.execute cmd 'b.db' This avoids sql injection and is apparently slightly faster so it's win..
http://stackoverflow.com/questions/3764291/checking-network-connection expected to respond quickly. Using a numerical IP address avoids a DNS lookup which may block the urllib2.urlopen call for more..
http://stackoverflow.com/questions/401277/naming-python-loggers in the file typically gets me to where I want to be. This avoids the need for self.log all over the place which tends to bother..
Flattening a shallow list in Python http://stackoverflow.com/questions/406121/flattening-a-shallow-list-in-python Edit As J.F. Sebastian says itertools.chain.from_iterable avoids the unpacking and you should use that to avoid magic but the..
Python: if key in dict vs. try/except http://stackoverflow.com/questions/4512557/python-if-key-in-dict-vs-try-except have that benefit here. It has the small advantage that it avoids having to say blah twice but if you're doing a lot of these..
In Python, is read() , or readlines() faster? http://stackoverflow.com/questions/5076024/in-python-is-read-or-readlines-faster for is probably still microscopically faster because it avoids a method call . However choosing one over the other for performance..
Python: string.replace vs re.sub http://stackoverflow.com/questions/5668947/python-string-replace-vs-re-sub as you can make do with str.replace you should use it. It avoids all the pitfalls of regular expressions like escaping and is..
http://stackoverflow.com/questions/638893/what-is-the-most-efficient-way-in-python-to-convert-a-string-to-all-lowercase-st using set.__contains__ makes a big difference here as it avoids making an extra function call for the lambda. share improve..
Why does Python's itertools.permutations contain duplicates? (When the original list has duplicates) http://stackoverflow.com/questions/6534430/why-does-pythons-itertools-permutations-contain-duplicates-when-the-original not testing for equality on objects itertools.permutations avoids paying the cost of calling the __eq__ method in the usual case.. to be made that itertools ought to provide a function that avoids duplicate permutations but such a function should be in addition..
Find the number of occurrences of a subsequence in a string http://stackoverflow.com/questions/6877249/find-the-number-of-occurrences-of-a-subsequence-in-a-string instance in the illustration above . Dynamic programming avoids such redundant computations by remembering the results from..
http://stackoverflow.com/questions/855759/python-try-else than adding additional code to the try clause because it avoids accidentally catching an exception that wasn ™t raised by the..
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