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问题 I am very new to Python. I have a list of tuples, where I created bigrams. This question is pretty close to my needs my_list = [('we', 'consider'), ('what', 'to'), ('use', 'the'), ('words', 'of')] Now I am trying to convert this into a frequency matrix The desired output is consider of the to use we what words consider 0 0 0 0 0 0 0 0 of 0 0 0 0 0 0 0 0 the 0 0 0 0 0 0 0 0 to 0 0 0 0 0 0 0 0 use 0 0 1 0 0 0 0 0 we 1 0 0 0 0 0 0 0 what 0 0 0 1 0 0 0 0 words 0 1 0 0 0 0 0 0 How to do this,

问题 I want to remove all \r \n \r\n which is pretty easy to so I wrote: str_replace(array("\r","\n"),"",$text); but I saw this line: str_replace(array("\r","\n","\\r","\\n"),"",$text); and I was wondering what is the double backslash means \\r and \\n . 回答1: \ is an escape character, it's used to escape the following character. In "\n" , the backslash escapes n and the result will be a new line character. In "\\n" , the first backslash escapes the second backslash and the n is kept as is, so the

问题 I would like to change the upper case string characters in a variable to lower case and replace the spaces with "_". I know I can use an 'if' statement for all instances but this would take too long. It is to save the input of a user to a filename i.e. user_selection = 'Barracuda Limited' # what I have save_name == 'barracuda_limited' # what I want Note: I have read through the page on how to post and am trying my best, but I have just started to learn coding and am having trouble trying to

问题 I would like to change the upper case string characters in a variable to lower case and replace the spaces with "_". I know I can use an 'if' statement for all instances but this would take too long. It is to save the input of a user to a filename i.e. user_selection = 'Barracuda Limited' # what I have save_name == 'barracuda_limited' # what I want Note: I have read through the page on how to post and am trying my best, but I have just started to learn coding and am having trouble trying to

问题 I have an Excel VBA macro that outputs to a text file. There is always a blank row at the bottom of the text file and I am having trouble getting rid of it. Any useful suggestions would be greatly appreciated! Thanks Sub testExport() Dim fPath As String, exportTxt As String fPath = CreateObject("WScript.Shell").SpecialFolders("Desktop") & "\Sample_" & Format(Now(), "HHNNSS") & ".txt" exportTxt = "Project: Sample Output" & vbCrLf exportTxt = exportTxt & "Model Version: 1 " Open fPath For

问题 I was wondering there is a way I can align vertically in React Native. I'm trying to position on the bottom but I don't think I can find a good way to do it. If anyone knows how to solve this issue, please let me know. 回答1: You can use the flex property, justifyContent to achieve this. Full documentation here. <View style={{justifyContent: 'center'}}> <Text>Vertically Centered Text</Text> </View> 回答2: to align any content including text both horizontally and vertically, simply use the

问题 I'm looking for a way to wrap text into a box of specific width using PHP. I have dynamic text strings coming in, and variable font sizes. I found a great way to cut the text up the way I want it from this thread: Smarter word-wrap in PHP for long words? Using this block of code: function smart_wordwrap($string, $width = 10, $break = "\n") { // split on problem words over the line length $pattern = sprintf('/([^ ]{%d,})/', $width); $output = ''; $words = preg_split($pattern, $string, -1, PREG

问题 I want to add an html formatted string on a vaadin label. The string comes from a database and goes straight to the label, it must be formatted with bold text, line breaks and some other fancy text things. I found a couple of solutions but those were for old version of vaadin, is there any way of doing this on vaadin flow? 回答1: You could add an HTML content to a label using: Label label = new Label(); label.getElement().setProperty("innerHTML","A new line should be created after this <br />

问题 In Excel When I sort the texts in ascending order, results shows as below. Text with the underscore character precedes the others. And in Excel cell, when I type in ="_" < "A", then "True" shows as expected. C10_ C10A C20_ C20A But, In Oracle, when I sort in ascending order, results shows as below. (I guess, Oracle treats '_' < 'A' False) C10A C10_ C20A C20_ How can I make Oracle sort the list exactly as Excel does? I have changed ASC to DESC, but the result was not what I expect. My sorting

问题 I'm looking to get basic metadata about the data within a database. Specifically, the number of line elements which are surrouned by the root text element. Analogous to what I'd expect COUNT to return in SQL -- a single integer. the database: thufir@dur:~/flwor/group$ thufir@dur:~/flwor/group$ basex BaseX 9.0.1 [Standalone] Try 'help' to get more information. > > open people Database 'people' was opened in 225.24 ms. > > xquery / <text> <line>people</line> <line>joe</line> <line>phone1</line>