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python Programming Glossary: expressionWhy does comparing strings in Python using either '==' or 'is' sometimes produce a different result? http://stackoverflow.com/questions/1504717/why-does-comparing-strings-in-python-using-either-or-is-sometimes-produce variables are set to the value 'public' . In a conditional expression I have the comparison var1 is var2 which fails but if I change..
http://stackoverflow.com/questions/15112125/if-x-or-y-or-z-blah improve this question You misunderstand how boolean expressions work. You are looking for if x 1 or y 1 or z 1 x and y are.. use or python sees each side of the operator as separate expressions. The expression x or y 1 is treated as first a boolean test.. each side of the operator as separate expressions. The expression x or y 1 is treated as first a boolean test for x then if that..
Evaluating a mathematical expression in a string http://stackoverflow.com/questions/2371436/evaluating-a-mathematical-expression-in-a-string a mathematical expression in a string stringExp 2^4 intVal int stringExp # Expected value.. more importantly safer method to evaluate a mathematical expression that is being stored in a string python math share improve.. question Pyparsing can be used to parse mathematical expressions. In particular fourFn.py shows how to parse basic arithmetic..
Suggestions for a Cron like scheduler in Python? http://stackoverflow.com/questions/373335/suggestions-for-a-cron-like-scheduler-in-python unfamiliar with cron you can schedule tasks based upon an expression like 0 2 7 usr bin run backup # run the backups at 0200 on Every.. between 9am and 5pm on Mondays to Fridays. The cron time expression syntax is less important but I would like to have something.. this end I'm looking for the expressivity of the cron time expression but in Python. Cron has been around for years but I'm trying..
How can I merge (union) two Python dictionaries in a single expression? http://stackoverflow.com/questions/38987/how-can-i-merge-union-two-python-dictionaries-in-a-single-expression can I merge union two Python dictionaries in a single expression I have two Python dictionaries and I want to write a single.. have two Python dictionaries and I want to write a single expression that returns these two dictionaries merged. The update method..
Generator Expressions vs. List Comprehension http://stackoverflow.com/questions/47789/generator-expressions-vs-list-comprehension vs. List Comprehension When should you use generator expressions vs. list comprehensions in Python and vice versa # Generator.. list comprehensions in Python and vice versa # Generator expression x 2 for x in range 256 # List comprehension x 2 for x in range.. can't be added to lists Basically use a generator expression if all you're doing is iterating once. If you want to store..
Python string formatting: % vs. .format http://stackoverflow.com/questions/5082452/python-string-formatting-vs-format time as any other operation when the string formatting expression is evaluated. And Python not being a lazy language evaluates.. evaluated. And Python not being a lazy language evaluates expressions before calling functions so in your log.debug example the expression.. before calling functions so in your log.debug example the expression some debug info s some_info will first evaluate to e.g. some..
How do you validate a URL with a regular expression in Python? http://stackoverflow.com/questions/827557/how-do-you-validate-a-url-with-a-regular-expression-in-python do you validate a URL with a regular expression in Python I'm building a Google App Engine app and I have a..
list comprehension without [ ], Python http://stackoverflow.com/questions/9060653/list-comprehension-without-python str _ for _ in xrange 10 This is called a generator expression and is explained in PEP 289 . The main difference between generator.. in PEP 289 . The main difference between generator expressions and list comprehensions is that the former don't create the..
http://stackoverflow.com/questions/1085337/linq-in-python Microsoft created Linq Language Integrated Query using Expression trees which is a math concept on how to parse operations into.. the result. Pynq is an implementation in Python of the Expression Tree theory and some of the providers. There will be more providers..
Replace URL with a link using regex in python http://stackoverflow.com/questions/1112012/replace-url-with-a-link-using-regex-in-python want. For more information please see the Python Regular Expression HOWTO . import re pat1 re.compile r ^ n w w # ~. @ w # ~ . @..
regexps: variable-length lookbehind-assertion alternatives http://stackoverflow.com/questions/11640447/regexps-variable-length-lookbehind-assertion-alternatives but not so flexible of course. More about K Perl Regular Expression K Trick PCRE Regex Spotlight K As far as I understand you can't..
Regular Expression to match cross platform newline characters http://stackoverflow.com/questions/1331815/regular-expression-to-match-cross-platform-newline-characters Expression to match cross platform newline characters My program can accept..
Regular Expression for single line comments http://stackoverflow.com/questions/15423658/regular-expression-for-single-line-comments Expression for single line comments What is the regular expression for..
http://stackoverflow.com/questions/1545403/math-expression-evaluation Expression Evaluation What is the best way to implement a python program..
How to write the Visitor Pattern for Abstract Syntax Tree in Python? http://stackoverflow.com/questions/2525677/how-to-write-the-visitor-pattern-for-abstract-syntax-tree-in-python To simplify everything suppose I have nodes Root Expression Number Op and the tree looks like this Root Op Number 5 ..
Any good and gentle Python Regexp tutorials out there? http://stackoverflow.com/questions/2717856/any-good-and-gentle-python-regexp-tutorials-out-there tutorials out there I read through the official Regular Expression HOWTO but it wasn't gentle enough for this OP's tiny brain...
Python Regular Expression Matching: ## ## http://stackoverflow.com/questions/4001980/python-regular-expression-matching Regular Expression Matching ## ## I'm searching a file line by line for the occurrence..
Chopping media stream in HTML5 websocket server for webbased chat/video conference application http://stackoverflow.com/questions/4242081/chopping-media-stream-in-html5-websocket-server-for-webbased-chat-video-conferen in chunks with Python We know Microsoft already build the Expression Encoder 2 which enables Adaptive Streaming but it only supports..
what is the difference between an Expression and a Statement in Python? http://stackoverflow.com/questions/4728073/what-is-the-difference-between-an-expression-and-a-statement-in-python is the difference between an Expression and a Statement in Python In Python what is the difference.. in Python In Python what is the difference between Expressions and Statements Thanks. python expression statement share.. expression statement share improve this question Expressions only contain identifiers literals and operators where operators..
Reversing a regular expression in python http://stackoverflow.com/questions/492716/reversing-a-regular-expression-in-python regex .data I took everything from the Regular Expression Syntax up to groups this seems like a reasonable subset and..
python: convert “5,4,2,4,1,0” into [[5, 4], [2, 4], [1, 0]] http://stackoverflow.com/questions/5083194/python-convert-5-4-2-4-1-0-into-5-4-2-4-1-0 can also replace the list comprehension with a Generator Expression by replacing the with as in nums int x for x in num_str.split..
Regex: How to match sequence of key-value pairs at end of string http://stackoverflow.com/questions/5323703/regex-how-to-match-sequence-of-key-value-pairs-at-end-of-string More info Python re module documentation Python Regular Expression HOWTO Perl Regular Expression Reference perlreref share improve..
How to tell if one regular expression matches a subset of another regular expression? http://stackoverflow.com/questions/6363397/how-to-tell-if-one-regular-expression-matches-a-subset-of-another-regular-expres such as Constructing a minimum state DFA from a Regular Expression but they only tend to consider mathematically pure regexps...
Perl Compatible Regular Expression (PCRE) in Python http://stackoverflow.com/questions/7063420/perl-compatible-regular-expression-pcre-in-python Compatible Regular Expression PCRE in Python I have to parse some strings based on PCRE in.. the current recommendations of UTS#18 Unicode Regular Expressions in how it approaches things. It meets or exceeds the UTS#18..
“Slicing” in Python Expressions documentation http://stackoverflow.com/questions/752602/slicing-in-python-expressions-documentation Slicing&rdquo in Python Expressions documentation I don't understand the following part of the.. self item ... print type item item ... t TestGetitem Expression example t 1 type 'int' 1 t 3 2 type 'int' 1 t 'test' type 'str'..
Search and replace multiple lines in xml/text files using python http://stackoverflow.com/questions/9058867/search-and-replace-multiple-lines-in-xml-text-files-using-python times is not unique . I am using the Python Regular Expression manual here 1 python regex xpath share improve this question..
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