Specific Solution You can use a function to replace each one. var str = “I have a cat, a dog, and a goat.”; var mapObj = { cat:”dog”, dog:”goat”, goat:”cat” }; str = str.replace(/cat|dog|goat/gi, function(matched){ return mapObj[matched]; }); jsfiddle example Generalizing it If you want to dynamically maintain the regex and just add future exchanges … Read more
Try using a list comprehension and a conditional expression. >>> a=[1,2,3,1,3,2,1,1] >>> [4 if x==1 else x for x in a] [4, 2, 3, 4, 3, 2, 4, 4]
.ix indexer works okay for pandas version prior to 0.20.0, but since pandas 0.20.0, the .ix indexer is deprecated, so you should avoid using it. Instead, you can use .loc or iloc indexers. You can solve this problem by: mask = df.my_channel > 20000 column_name=”my_channel” df.loc[mask, column_name] = 0 Or, in one line, df.loc[df.my_channel > … Read more
As pointed out by michaelb958, you cannot replace in place with data of a different length because this will put the rest of the sections out of place. I disagree with the other posters suggesting you read from one file and write to another. Instead, I would read the file into memory, fix the data … Read more
Strings in Python are immutable (can’t be changed). Because of this, the effect of line.replace(…) is just to create a new string, rather than changing the old one. You need to rebind (assign) it to line in order to have that variable take the new value, with those characters removed. Also, the way you are … Read more
And when I debug this the logic does fall into the sentence.replace. Yes, and then you discard the return value. Strings in Java are immutable – when you call replace, it doesn’t change the contents of the existing string – it returns a new string with the modifications. So you want: sentence = sentence.replace(“and”, ” … Read more
In JavaScript, strings are immutable, which means the best you can do is to create a new string with the changed content and assign the variable to point to it. You’ll need to define the replaceAt() function yourself: String.prototype.replaceAt = function(index, replacement) { return this.substring(0, index) + replacement + this.substring(index + replacement.length); } And use … Read more
Here is a short example that should do the trick with regular expressions: import re rep = {“condition1”: “”, “condition2”: “text”} # define desired replacements here # use these three lines to do the replacement rep = dict((re.escape(k), v) for k, v in rep.iteritems()) #Python 3 renamed dict.iteritems to dict.items so use rep.items() for latest … Read more
Renaming column names in Pandas
Martin Brandl’s answer provides an elegant and effective solution, but it’s worth digging deeper: PowerShell’s -replace operator (… -replace <search>[, <replace>]): Takes a regular expression as its first operand, <search> (the search expression), and invariably matches globally, i.e., it replaces all matches. ‘bar’ -replace ‘[ra]’, ‘@’ -> ‘b@@’ If you want to replace a literal … Read more