concatenation

问题 I'm tring to concatenate two strings encoded to base64 but it doesn't really work, just prints the first string in concatanation: q = base64.b64encode("StringA") print q # prints an encoded string q = q+base64.b64encode("StringB") print q # prints an encoded string print base64.b64decode(q) # just prints "StringA" 回答1: You are decoding a string that is concatenation of two base64 strings. This is not correct. You should do something like this - base64.b64decode(base64.b64encode("StringA" +

问题 I'm tring to concatenate two strings encoded to base64 but it doesn't really work, just prints the first string in concatanation: q = base64.b64encode("StringA") print q # prints an encoded string q = q+base64.b64encode("StringB") print q # prints an encoded string print base64.b64decode(q) # just prints "StringA" 回答1: You are decoding a string that is concatenation of two base64 strings. This is not correct. You should do something like this - base64.b64decode(base64.b64encode("StringA" +

问题 According to Ron Wein your able to do split and concatenation of red-black tree's in O(log(n)) time. See his artikle: Efficient Implementation of Red-Black Trees with Split and Catenate Operations However I'm still not convinced that the running time of split really is true. The idea is that split uses worst-case log(n) concatenatations. These concat's is done fast as we can find the node, p, by remembering the p, from last concatenate. The problem is that concatenation starts the fix-up

问题 According to Ron Wein your able to do split and concatenation of red-black tree's in O(log(n)) time. See his artikle: Efficient Implementation of Red-Black Trees with Split and Catenate Operations However I'm still not convinced that the running time of split really is true. The idea is that split uses worst-case log(n) concatenatations. These concat's is done fast as we can find the node, p, by remembering the p, from last concatenate. The problem is that concatenation starts the fix-up

问题 Is there a simple way to bind a concatenation of StringProperty objects? Here is what I want to do: TextField t1 = new TextField(); TextField t2 = new TextField(); StringProperty s1 = new SimpleStringProperty(); Stringproperty s2 = new SimpleStringProperty(); Stringproperty s3 = new SimpleStringProperty(); s1.bind( t1.textProperty() ); // Binds the text of t1 s2.bind( t2.textProperty() ); // Binds the text of t2 // What I want to do, theoretically : s3.bind( s1.getValue() + " <some Text> " +

问题 I have two csr_matrix , uniFeature and biFeature . I want a new matrix Feature = [uniFeature, biFeature] . But if I directly concatenate them this way, there's an error that says the matrix Feature is a list. How can I achieve the matrix concatenation and still get the same type of matrix, i.e. a csr_matrix ? And it doesn't work if I do this after the concatenation: Feature = csr_matrix(Feature) It gives the error: Traceback (most recent call last): File "yelpfilter.py", line 91, in <module>

问题 This question already has answers here : How to concatenate a std::string and an int? (23 answers) Closed 4 years ago . string words[5]; for (int i = 0; i < 5; ++i) { words[i] = "word" + i; } for (int i = 0; i < 5; ++i) { cout<<words[i]<<endl; } I expected result as : word1 . . word5 Bu it printed like this in console: word ord rd d Can someone tell me the reason for this. I am sure in java it will print as expected. 回答1: C++ is not Java. In C++, "word" + i is pointer arithmetic, it's not

问题 I have a pretty long list of numbers that I would like to concatenate for a regex like this: 2323 2352 3432 … 2323|2352|3432 Now, I can obviously use the CONCATENATE function, but it would still require me to enter each row individually like this: =CONCATENATE(A1, "|", A2, …) Is there any way to apply a range together with the splitting character? 回答1: Typically this is a job for TEXTJOIN, available in Excel 2019 and O365. =TEXTJOIN("|",,A1:A3) 来源： https://stackoverflow.com/questions/63050210

问题 I have a pretty long list of numbers that I would like to concatenate for a regex like this: 2323 2352 3432 … 2323|2352|3432 Now, I can obviously use the CONCATENATE function, but it would still require me to enter each row individually like this: =CONCATENATE(A1, "|", A2, …) Is there any way to apply a range together with the splitting character? 回答1: Typically this is a job for TEXTJOIN, available in Excel 2019 and O365. =TEXTJOIN("|",,A1:A3) 来源： https://stackoverflow.com/questions/63050210

问题 I am trying to merge the data from three columns into one column in Excel. Example, i would like to merge Product, Location, and Key_id into one column Product Location Key_Id Car VA 86421910 Car VA 86424482 Car VA 86416836 Combined Column: Car 'VA', '86421910' Car 'VA', '86424482' Car 'VA', '86416836' I was wondering if there is a way in Excel that can do it? Thanks in advance! I was not doing a good job of accepting the answers in the past. I will do my part which is to accept the answer