printing

问题 I am creating a dataframe using this code: df <- data.frame(dbGetQuery(con, paste('select * from test'))) Which results in this: UID BuildingCode AccessTime 1 123456 BUILD-1 2014-06-16 07:00:00 2 364952 BUILD-2 2014-06-15 08:00:00 3 95865 BUILD-1 2014-06-06 09:50:00 I am then trying to remove the row names (1, 2, 3, etc) as suggested here by using this code: rownames(df) <- NULL But then when I print out df it still displays the row names. Is there a way to not include the row names when

问题 I have a Swing form with a custom table inside a JScrollPane (it's just a JPanel, not a JTable subclass), and I am trying to get it to print. If I just send the whole frame to the printer, the scroll pane cuts off, and if I resize the frame to the size of the contents of the scroll pane, some sort of internal barrier stops the JFrame becoming more than about 1100 pixels tall. Another alternative would be to create the content pane of the dialog without attaching it to the root JFrame, because

问题 This is the dictionary cars = {'A':{'speed':70, 'color':2}, 'B':{'speed':60, 'color':3}} Using this for loop for keys,values in cars.items(): print(keys) print(values) It prints the following: B {'color': 3, 'speed': 60} A {'color': 2, 'speed': 70} But I want the program to print it like this: B color : 3 speed : 60 A color : 2 speed : 70 I just started learning dictionaries so I'm not sure how to do this. 回答1: for x in cars: print (x) for y in cars[x]: print (y,':',cars[x][y]) output: A

问题 We would need a portable printer (handheld, it is important) that can connect to android phone via bluetooth or wifi. What I know currently: No standard printing SDK available for Android this time There is a non official SDK called iPrint SDK. Have any of you tried it through wifi or bluetooth? Does it work? Printershare also claims to be programmaticly available. It would be ok for me to pay the one time fee $5 for it per phone. It has a lot of supported formats. Have you tried it with any

问题 We would need a portable printer (handheld, it is important) that can connect to android phone via bluetooth or wifi. What I know currently: No standard printing SDK available for Android this time There is a non official SDK called iPrint SDK. Have any of you tried it through wifi or bluetooth? Does it work? Printershare also claims to be programmaticly available. It would be ok for me to pay the one time fee $5 for it per phone. It has a lot of supported formats. Have you tried it with any

问题 We would need a portable printer (handheld, it is important) that can connect to android phone via bluetooth or wifi. What I know currently: No standard printing SDK available for Android this time There is a non official SDK called iPrint SDK. Have any of you tried it through wifi or bluetooth? Does it work? Printershare also claims to be programmaticly available. It would be ok for me to pay the one time fee $5 for it per phone. It has a lot of supported formats. Have you tried it with any

问题 I would like to be able to do something like #print "C Preprocessor got here!" for debugging purposes. What's the best / most portable way to do this? 回答1: The warning directive is probably the closest you'll get, but it's not entirely platform-independent: #warning "C Preprocessor got here!" AFAIK this works on most compilers except MSVC, on which you'll have to use a pragma directive: #pragma message ( "C Preprocessor got here!" ) 回答2: The following are supported by MSVC, and GCC. #pragma

问题 I understand the difference between a statement and an expression, and I understand that Python3 turned print() into a function. However I ran a print() statement surrounded with parenthesis on various Python2.x interpreters and it ran flawlessly, I didn't even have to import any module. My question: Is the following code print("Hello SO!") evaluated as a statement or an expression in Python2.x? 回答1: Consider the following expressions: a = ("Hello SO!") a = "Hello SO!" They're equivalent. In

问题 Am I able to overload the print function and call the normal function from within? What I want to do is after a specific line I want print to call my print which will call the normal print and write a copy to file. Also I don't know how to overload print . I don't know how to do variable length arguments. I'll look it up soon but overload print python just told me I can't overload print in 2.x which is what I am using. 回答1: For those reviewing the previously dated answers, as of version

问题 In the standard PrintDialog there are four values associated with a selected printer: Status, Type, Where, and Comment. If I know a printer's name, how can I get these values in C# 2.0? 回答1: As dowski suggested, you could use WMI to get printer properties. The following code displays all properties for a given printer name. Among them you will find: PrinterStatus, Comment, Location, DriverName, PortName, etc. using System.Management; ... string printerName = "YourPrinterName"; string query =