string-formatting

问题 What I'm referring to is concatenating String s with a certain String in the middle, such as concatenating sentences separated by a period, or parameter lists with a comma. I know you can use libraries, but sometimes these can't do what you want, like when you want to generate the phrases you are concatenating. So far I've come up with two solutions, StringBuffer sentence = new StringBuffer(); String period = ""; for ( int i = 0; i < sentences.length; i++ ) { sentence.append( period +

问题 Quick(I hope) question. I've got this DataGrid, containing a few currency column's. What I can't seem to find is how to display the currency in 2 decimals. But maintaining a possible 3 or 4 decimal value in the cell. If tried some string-formatting but that actually changes the value. And so does a IValueConverter of course. So what am I missing? or could anybody point me in the right direction? EDIT: after the suggestion I tried something like this. <Style x:Key="DecimalTextBlockStyle"

问题 Okay this is an easy one but I'd hugely appreciate your help because I've been mucking around for an hour trying to get it to work. How do I change the following to get rid of the decimal places and just show the whole number? Binding="{Binding ANLA, StringFormat=n}" I know the format is something like {0:0,0} But I can't get the backslashes to work. Thanks hugely in advance! 回答1: You almost had it... how about trying this: {Binding ANLA, StringFormat='0,0.'} Please note that this will round

问题 Is there any automatic way to convert a piece of code from python's old style string formatting (using % ) to the new style (using .format )? For example, consider the formatting of a PDB atom specification: spec = "%-6s%5d %4s%1s%3s %1s%4d%1s %8.3f%8.3f%8.3f%6.2f%6.2f %2s%2s" I've been converting some of these specifications by hand as needed, but this is both error prone, and time-consuming as I have many such specifications. 回答1: Use pyupgrade pyupgrade --py3-plus <filename> You can

问题 I'm working in Silverlight 4 and I'm trying to insert an apostrophe in a value that is bound to a TextBlock: <TextBlock Text="{Binding MyValue, StringFormat='The value is &apos;{0}&apos;'}"/> However, I'm getting XAML parse errors even though I have tried escaping with it with \' and " to no success. 回答1: This will work in WPF or Silverlight. <Grid> <Grid.Resources> <system:String x:Key="Format">The value is '{0}'</system:String> </Grid.Resources> <TextBlock Text="{Binding MyValue,

问题 How can I set up the string format so that I could use a variable to ensure the length can change as needed? For example, lets say the length was 10 at first, then the input changes then length becomes 15. How would I get the format string to update? length = 0 for i in self.rows: for j in i: if len(j) > length: length = len(j) print('% length s') Obviously the syntax above is wrong but I can't figure out how to get this to work. 回答1: Using str.format >>> length = 20 >>> string = "some string

问题 How can I use String.Format in C# so doubles are displayed like this: example: ___-1.000 ____1.000 __100.123 -1000.321 _1000.214 etc... Where _ is space ( " " ); All I can do is String.Format("{0:F3}", -123.321); 回答1: You can use alignment: String.Format("{0,10:F3}", -123.321) where 10 is preffered length. See Composite Formatting. 回答2: Found a quick article, in short: String.Format("{0,10:0.0}", 123.4567); // " 123.5" String.Format("{0,-10:0.0}", 123.4567); // "123.5 " String.Format("{0,10:0

问题 I am printing some dates on my webform. Currently my Date Format is dd:mmm:yyyy hh:mm How can I change the date format to ddth mmm,yyyy for example 17th May,2016 hh:mm Here is my Code : lastlogin = DateTime.Parse(dt_LastLoginDetail.Rows[0]["login_time"].ToString()); lastlogindate = "Last Login Date: " + lastlogin.ToString("dd-MMM-yyy hh:mm tt"); 回答1: Try this: lastlogin = DateTime.Parse(dt_LastLoginDetail.Rows[0]["login_time"].ToString()); string suffix; switch (lastlogin.Day) { case 1: case

问题 I want to print a decimal using a comma as decimal separator. When I do this import locale locale.setlocale(locale.LC_ALL, 'nl_NL') '{0:#.2n}'.format(1.1) I get '1,1' . The comma is there, but the precision is only one, whereas I set it to two. How come? Note this format is constructed as follows: # : "The '#' option causes the "alternate form" to be used for the conversion. ... In addition, for 'g' and 'G' conversions, trailing zeros are not removed from the result." .2 : Precision. n :

问题 So, I'm a bit stymied. According to man 3 printf on my system, the string format "%5s" should use the specified precision to limit the number of characters printed from the string argument given. % man 3 printf PRINTF(3) BSD Library Functions Manual PRINTF(3) NAME printf, fprintf, sprintf, snprintf, asprintf, vprintf, vfprintf, vsprintf, vsnprintf, vasprintf -- formatted output conversion ... s The char * argument is expected to be a pointer to an array of character type (pointer to a string)