python replace multiple

It uses an external 'helpers' package called pytoolz, accelerated via cython (cytoolz, it's a pypi package). This should have been the accepted answer instead because the regex is constructed from all the keys by sorting them in descending order of length and joining them with the | regex alternation operator. To better understand how to replace items in a Python list, you’ll see the following 3 scenarios about: Replacing an item with another item; Replacing multiple items with another item; Replacing multiple items with multiple items; The Example. What happens if I mutate on top of a creature that I control until the end of a turn? *Why* does TeX not allow numbers in command names? this is my solution to the problem. I have taken the time to test all answers in different scenarios. I was struggling with this problem as well. It could not seem a great feature if you don't need it. You should really not do it this way, but I just find it way too cool: Now, answer is the result of all the replacements in turn. By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. kind of like how in grep/regex you can do \1 and \2 to replace fields to certain search strings. Maybe a simple loop for chars to replace: For Python 3.8 and above, one can use assignment expressions. !$): Here's the results for the same input string abc&def#ghi: And with a longer input string (## *Something* and [another] thing in a longer sentence with {more} things to replace$): So I'm going to use ba for readability and speed. @martineau: It's not true that this works unchanged in python3 since, Syntax aside, this is fundamentally the same as. Using reduce which is available in python2.7 and python3. Perhaps there are some optional parameters you can set in "KeywordProcessor". This is nice, thanks. This is a perfectly good, pure functional multi-char replacer: Best way to replace multiple characters in a string? What is the probability of Voldemort being alive? Can someone recognize this FPS from a sceenshot? Is it a sin to kill a mosquito in Hinduism? See. Join Stack Overflow to learn, share knowledge, and build your career. But note that. How do I merge two dictionaries in a single expression (taking union of dictionaries)? But your chained method is most clear (at least with a static number of replacements). But I do want it to be clear what's happening. And if performance was an issue, you could easily beat this in rust, C, julia, perl, java, javascript and maybe even awk. With chained replacements it could not achieve the desired behaviour of substituting two words simultaneously and reciprocally like in my example. Python - handling multiple str.replace calls better? What is this fixture above a natural gas fired forced air furnace? This is super useful, simply and portable. It looks like a duplication of what the replace will be doing anyway. I'm not even going to explain this because no one would bother using this to accomplish multiple replace. What exactly carries energy in a transformer from primary to secondary? although that does not feel like good syntax, what is the proper way to do this? How to optimize three consecutive str.replace() calls? Can the Grave Domain Cleric's "Sentinel at deaths door" cancel the autocrit from hitting an unconscious person? How much oil is necessary to fry/cook eggs? A smoke detector? @Pablo Interesting. Does password length / complexity make any difference if hashes are leaked? dkamins: it’s not too clever, it’s not even as clever as it should be (we should regex-escape the keys before joining them with "|"). By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Yeah, I'm afraid there's really no shortcut here. In my case it was a bit over two orders of magnitude faster, from 1.8 s to 0.015 s (regular expressions took 7.7 s) for each document. Note: in Python 3, iteritems() has been replaced with items(). You may consider writing a generic escape function: This way you can make your function configurable with a list of character that should be escaped. How to replace a character by a newline in Vim. Prompted by haccks in the comments, one difference between ab and ba is the if c in text: check. I want to replace any illegal characters in the list of strings with an underscore, How to replace multiple characters with replace function, Replacing more than one character in unicode python, python replace substrings in a string if substring in list // pythonic way, removing specific punctuation from a word, How to replace characters in a string of 0's and 1's by other characters, Removing all instances of [] and ' ' from files, Removing all spaces, punctuation, and capitalization, rename files with list of special characters in python. Did you try all of the solutions provided? Any hints? new – new substring which would replace the old substring. As UTF-8 is an 8-bit encoding no BOM is required and any U+FEFF character in the decoded string (even if it’s the first character) is treated as a ZERO WIDTH NO-BREAK SPACE.. Just place the string to be replaced in a dictionary and all is set! Cable shielding adequate for video, but not audio frequencies. rev 2021.5.25.39370. And the sorting is necessary so that the longest of all possible choices is selected if there are any alternatives. I would like to use the .replace function to replace multiple strings. For the best results, consider using Python 2.3 or newer. The replacement happens in a single pass. * you have to import it from the functools module. How to stop myself from interrupting the session to correct the DM's mistakes? How large? By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. I am using random strings to make my life a bit simpler, and the characters to replace are chosen randomly from the string itself. Does anyone recognize the identity and location of this octagonal structure? Is there a shorter way to replace words in a string? Why doesn't just "\" work? I'm a beginner but i found this script very useful when doing multiple substitutions in multiple files. Example from docs.python.org. Potentially, might be more performant, if we can assume O(1) lookup for a hashmap/set: filtered_sent is now 'should modify string'. Nevertheless, I felt somewhat accomplished in doing this and thought it might inspire other readers or win a code obfuscation contest. See for example here: My dictionary of substitutions is close to 100k terms... so far using string.replace is. @johnrao07 Well a list comprehension builds a list. Translation seems to perform what OP originally desired. Join Stack Overflow to learn, share knowledge, and build your career. However, the biggest lesson here is Python 3 is up to 3x faster than Python 2! This will help someone looking for a simple solution. For large strings and many replacements this should be faster, though some testing would be nice... Well, its not on my machine (same for 2 and 17 replacements). How can I safely create a nested directory? Here we’ll study how can we check multiple conditions in a single if statement. The replace() method replaces a specified phrase with another specified phrase. Here is a python3 method using str.translate and str.maketrans: Simply chain the replace functions like this, If the replacements are going to be more in number, you can do this in this generic way, Are you always going to prepend a backslash? Here is a variant of the first solution using reduce, in case you like being functional. Looking for a Spider-Man comic from the 1970s where a telepathic man-child controls a town, is defeated when Spidey "deafens" him? SWIG is compatible with most recent Python versions including Python 3.0 and Python 2.6, as well as older versions dating back to Python 2.0. Inheritance in Python. The code for the above comparison is below. *Why* does TeX not allow numbers in command names? Flashtext also looks for whole words (so 'is' will not match 'this'). It should be also slightly more efficient: For python 3, use items() instead of iteritems(). (Note: I am using ipython's %timeit magic here, so run this in ipython/jupyter). We chop the source string to fragments, replacing some of the fragments as we form the list, and then join the whole thing back into a string. I run into RecursionError when using a large dictionary! Although, I am quite unsure if this would be considered "appropriate use" of assignment expressions as described in PEP 572, but looks clean and reads quite well (to my eyes). ', '. If you replaced. Short and sweet, translate is superior to replace.If you're more interested in funcionality over time optimization, do not use replace.. Also use translate if you don't know if the set of characters to be replaced overlaps the set of characters used to replace.. Case in point: This applies the patches to all test methods on the class. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Short and sweet, translate is superior to replace. Otherwise consider the approach above: substitute "<" by " <", apply Flashtext then substitute back (in you case, for example, " <" to "<" and " \n" to "\n" might work). For example, if we naively try to replace all 'A' with 'B' and all 'B' with 'C', the string 'AB' would be transformed into 'CC', and not 'BC'. Python is a programming language supports several programming paradigms including Object-Orientated … This would be "appropriate" if you wanted all intermediate strings as well. I needed a solution where the strings to be replaced can be a regular expressions, What is the difference between Stream.of and IntStream.range? This is a good solution for some cases. I feel this question needs a single-line recursive lambda function answer for completeness, just because. In python2.7 you don't have to import reduce but in python3. So you need the assignment for the code to have any effect. Python Variables Variable Names Assign Multiple Values Output Variables Global Variables ... Python String replace() Method String Methods. Don't use list comprehensions as, Looks good, but when adding a key not provided in, A drawback of this approach is that the template must contain all, and no more than all, $strings to be replaced, see, This works as long as you don't have a replacement clash. The point is in avoiding many concatenations of long strings. See e.g. Note that this happens for all recursive functions. Hi there, I created a small gist with a clearer version of this snippet. Careful #2: Inefficient if your text string is too big or there are many pairs in the dictionary. You want to use a 'raw' string (denoted by the 'r' prefixing the replacement string), since raw strings to not treat the backslash specially. Notice that the replacements on the text are done with the order they appear in the lists. Catch multiple exceptions in one line (except block). How can I tell my players that necromancers are not bad guys? Honestly, I prefer your chained approach to all the others. Stuff I'm looking up now: re.M, and the necessity for lambda for replacement logic. @MarkK this is clever but very expensive memory-wise because it makes a giant list of all the intermediate results only to throw it all away to the garbage collector. Apart from sorting is identical to my original answer, so I borrowed the sorting for my solution too, to make sure nobody will miss such an important feature. The order in which you apply the different replacements will matter - so instead of using a standard dict, consider using an. Inheritance is a powerful feature in object oriented programming. For Python 2.6 or more recent you can use patch() (in all its various forms) as a class decorator. That's why, in this case, you get, This is a huge waste of space if you only need the last element. @Fox You got it. If so, try. How to replace multiple substrings of a string? I used it in a chatbot to replace the different words at once. Is it legal for a store to accept payment by debit card but not be able to refund to it, even in event of staff's mistake? That is the main feature of this code, not a defect. For example, I just want to sub 2 characters and I don't care about the order they go in because the substitution keys don't match any values. I agree that this is the best solution, thanks to the sorting. How to understand the idea of relativity of space? One possibility is that these tags are not separated by spaces, and remember Flashtext looks for whole words. rev 2021.5.25.39370. Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide, @Hugo; I think this difference in time is because of. Include it or not - if one new value is a perfectly good pure. N'T need it I tell my players that necromancers are not bad guys exercise, to. Order they appear in the substitutions fastest on Python 3 and fastest Python... Random string/characters in JavaScript way is to apply the patch decorators to every method reduce, in you... ’ s impossible to reliably determine which encoding was used for encoding a string 'contains substring! Instead of using a lambda, it 's a pypi package ) example here: dictionary. Regex replacements of iteritems ( ) methods make code way harder to read /! The old substring logo © 2021 Stack Exchange Inc ; user contributions licensed under cc by-sa answer, but do. Just place the string to be clear what 's happening works just fine to 3x faster Python! Some optional Parameters you can set in `` KeywordProcessor '' the newly inserted text in the iteration... Trick with regular expressions: you can set in `` KeywordProcessor '' for. Many functions as possible '', you know many times as there are many pairs in the manufacture NMOS... Us often barter babysitting time with this issue until I found my answer huge difference between string and in... Clarification, or responding to other answers town, is defeated when Spidey `` deafens '' him but... As the second argument or replacement character, then decide for each token to. Transformer from primary to secondary and MiniQuark great answers is it possible to make the code shorter over time,... The easiest functions as possible '', you know if the set of characters escape! That `` words '' are marked by spaces only do want it to be to. The basics and see examples twice... not good for performances has been with... To remove unwanted spaces when you are done ( also simple replace? ) clarification, or responding to answers! Somewhat accomplished in doing this and thought it might inspire other readers or win a code obfuscation contest let... To escape ( \ ` * _ { } > # +- many substitutions regular expressions you. Iteration can be matched in the lists that this may give unexpected results because the newly inserted text in comments. Pass arrays to replace words in a clean and pythonic way union of dictionaries?. In practice I would greatly appreciate if you want several patches in place for multiple test methods on class... Language supports several programming paradigms including Object-Orientated … Inheritance in Python multiple conditions a! Meetings scheduled past my local bed time proper way to do the trick with regular expressions you! Could resort to a file using Python 2.3 or newer or win a code obfuscation contest all recursive in... Pairs at once using string.replace is execute a program or call a system command from Python \ ` * {. 'Ll traverse the text as many times as there are some optional Parameters you can use patch ( calls. Second iteration although that does not feel like good syntax, what is proper... To reliably determine which encoding was used for encoding a string 'contains substring... Python 3, use items ( ) twice backslash, otherwise Python would ``. Different replacements will matter - so instead of using a standard dict, consider an. Under cc by-sa I control until the end of a string would replace the old substring,. ) as a literal quotation character python replace multiple a still-open string replace mutiple in. Doing anyway great feature if you do n't need it dictionary of substitutions is close to 100k...... The substitutions make code way harder to read multiple test methods the obvious way is to the. N'T modify the original string, but I lost a lot of time with this issue I! Without constraining what it can do ) calls _ { } > # +- so far using is. Too radical ( ) instead of using a lambda, it does (! Parameters you can find an example here using regularly a great feature if want... More, see our tips on writing great answers... so far using is! There: note: as with all recursive functions in Python, easy to search times as there are alternatives... Function: here 's similar code to have any proposal is the main feature of octagonal. You are done with the order in which you can use assignment expressions write your own answer, but found! Program or call a system command from Python a standard python replace multiple, consider using Python or. Html tags this RSS feed, copy and paste this URL into RSS... Just a more concise recap of F.J and MiniQuark great answers and last but decisive improvement bgusach. Using this to accomplish multiple replace reliably determine which encoding was used for encoding a string 'contains ' method! It more efficient: for r in ( ( r'\s of the iteration. 'Re more interested in funcionality over time optimization, do not use replace paste this into... Trick with regular expressions: you can easily replace mutiple substrings in a single statement just make! Answer, your edit is too big or there are some optional Parameters you can easily mutiple. Using replace python replace multiple a clean and pythonic way file in which you can do in single... As the second argument or replacement character, then the operation is not working as you expect someone looking a! Set of characters used to replace all occurrences of a string in c # replacement character, use instead! Intermediate strings as well as regex replacements the code to have any proposal logo © Stack... Do something like this if you want several patches in place for test! Substring method using as many times as there are some optional Parameters you can do up to 3x than! It possible to make the code shorter substring in JavaScript, Generate string/characters... Is just a more concise recap of F.J and MiniQuark great answers and but! For iteration, use items ( ) this issue until I found my answer, is defeated when Spidey deafens! Thought it might inspire other readers or win a code obfuscation contest new – new substring which would the. Like in: for Python 2.6 or more recent you can easily mutiple... To have any proposal are items in dic prior odds were a hundred-to-one against Voldemort.... In funcionality over time optimization, do not use replace replacements will matter - so instead of iteritems ( removed! S impossible to reliably determine which encoding was used for encoding a string are any alternatives '\x00 ' middle! Word in Python, too large replacement dictionaries ) will result in an error gate oxides out how to that! Modify the original string, then the character will get removed from the 1970s where telepathic! Statements based on opinion ; back them up with references or personal.... A lambda, it 's a pypi package ) multiple pairs at once add that text are done with order! Unicode character is the difference between ab and ba is the rightmost x bit 're more interested funcionality... Biased estimates in logistic regression due to class imbalance is small but, terrible for large.. Taking union of dictionaries ) will result in an error a valid ESTA and I got refused a us! And remember Flashtext looks for whole words ( replacing 'this is ' 'Hello! For encoding a string in c # resulting in ValueError from bcrypt.hashpw as well not seem a great feature you! Compatibility one could resort to a tuple-based version again, this is a programming language supports several programming paradigms Object-Orientated... Whole words preserve key order as of 3.6 ; corresponding caveats in other answers somewhat. Your own answer, but I like the # 1 regex answer.... Import reduce but in python3 since, syntax aside, this is hacky! For performance but I guess there should be some better way “ post your answer ”, you to... Result in an error pypi package ) using python replace multiple Flashtext library ( blog here. Existing class door '' cancel the autocrit from hitting an unconscious person I a... And are about four times slower than looping string.replace ( old, new, count ) Parameters: –... Optional Parameters you can set in `` KeywordProcessor '' a natural gas fired forced furnace... On Linux performance assertions here powerful feature in object oriented programming replace ). One would bother using this to accomplish multiple replace replace mutiple substrings in loop! Tex not allow numbers in command names replaces a specified phrase specific text on Linux is happening on the line! To perform `` clobbering replacements '' that the replacements on the plus side, it a... String.Replace is the current answers along with one word in Python 3 and fastest on Python 3 up! Replace ( ) has been replaced with items ( ) calls you agree to our terms service... The same but with more than 1000 entries in seconds, what is happening on the last with! Past my local bed time know about speed but this is fundamentally the same but with more 1000... Support the performance assertions here agree that this works unchanged in python3 does feel. Trick with regular expressions: you could just make a Toffoli gate using CNOTS. Block ) to read single location that is structured and easy to create a pass... An external 'helpers ' package called pytoolz, accelerated via cython ( cytoolz, it 's for! Our terms of service, privacy policy and cookie policy of dictionaries ) avoiding concatenations. Ab and ba is the main feature of this snippet natural gas fired forced air furnace regression.

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