writing

问题 I almost finished my project, but there is still one little problem. I want to write sensor values in a txt file with Python. All is working fine but one thing : in the txt file, there're blank lines between each value. It's really annoying because I can't put the values in a spreadsheet. It looks like That: Sensor values: 2 4 6.32 1 etc.... When I want it that way : Sensor values: 1 2 3 5 8 etc... Here's the part of the code concerned : def write_data(): global file_stream now = datetime.now

问题 I want to write a header in a file if there is no row in dataframe, Currently when I write an empty dataframe to a file then file is created but it does not have header in it. I am writing dataframe using these setting and command: Dataframe.repartition(1) \ .write \ .format("com.databricks.spark.csv") \ .option("ignoreLeadingWhiteSpace", False) \ .option("ignoreTrailingWhiteSpace", False) \ .option("header", "true") \ .save('/mnt/Bilal/Dataframe'); I want the header row in the file, even if

问题 I have been having this problem for a few days now and I can find nothing on how to fix it. I have never had an error like this one : Unhandled exception at 0x00511e0e (msvcr100d.dll) in myproject.exe: 0xC0000005: Access violation writing location 0xfdfdfdfd. I really am at a loss of what to do. Any help? 回答1: 0xfdfdfdfd is a magic value in the MSVC debug heap implementation (details here) that's put as a canary directly before and behind an allocated region of storage. Somehow you're using

问题 I have been having this problem for a few days now and I can find nothing on how to fix it. I have never had an error like this one : Unhandled exception at 0x00511e0e (msvcr100d.dll) in myproject.exe: 0xC0000005: Access violation writing location 0xfdfdfdfd. I really am at a loss of what to do. Any help? 回答1: 0xfdfdfdfd is a magic value in the MSVC debug heap implementation (details here) that's put as a canary directly before and behind an allocated region of storage. Somehow you're using

问题 I have a .xlsx file in which multiple worksheets are there(with some content). I want to write some data into specific sheets say sheet1 and sheet5. Right now i am doing it using xlrd, xlwt and xlutils copy() function. But is there any way to do it by opening the file in append mode and adding the data and save it(Like as we do it for the text/csv files)? Here is my code : rb = open_workbook("C:\text.xlsx",formatting_info='True') wb = copy(rb) Sheet1 = wb.get_sheet(8) Sheet2 = wb.get_sheet(7)

问题 Is there a predefined or "easy" method of writing a datatable to a text file or TextBox Control (With monospace font) such as DataTable.Print(): Column1| Column2| --------|--------| v1| v2| v3| v4| v5| v6| Edit Here's an initial version (vb.net) - in case anyone is interested or wants to build their own: Public Function BuildTable(ByVal dt As DataTable) As String Dim result As New StringBuilder Dim widths As New List(Of Integer) Const ColumnSeparator As Char = "|"c Const HeadingUnderline As

问题 Is there a predefined or "easy" method of writing a datatable to a text file or TextBox Control (With monospace font) such as DataTable.Print(): Column1| Column2| --------|--------| v1| v2| v3| v4| v5| v6| Edit Here's an initial version (vb.net) - in case anyone is interested or wants to build their own: Public Function BuildTable(ByVal dt As DataTable) As String Dim result As New StringBuilder Dim widths As New List(Of Integer) Const ColumnSeparator As Char = "|"c Const HeadingUnderline As

问题 This app i'm working on allows the user to take pictures, and saves them locally (a small thumbnail image via Core Data, and the full-size image in the documents directory). I'm finding that writing the image file to the documents directory takes a long time, though -- 8 seconds on my iPhone 3GS, even longer on my iPhone 3G and first-gen iPod touch. I write the file this way: [imgData writeToFile:imagePath atomically:YES]; ... is there a faster way to do this? The iPhone's camera app seems to

问题 I am trying to use the data on my own .csv file to create a netCDF file using the R package "ncdf4". My dataset is composed by 3 columns: longitude, latitude and temperature and it has 2592 rows. I have been following the suggestions in the package to add the dimension and the variables to the netCDF file. Everything is fin until I want to write the temperature data on my file. I got this error: Error in ncvar_put(nc = ncnew, varid = var_temp, data, start = c(1, 1, : ncvar_put: error: you

问题 I've tried everything to write just one byte to a file in python. i = 10 fh.write( six.int2byte(i) ) will output '0x00 0x0a' fh.write( struct.pack('i', i) ) will output '0x00 0x0a 0x00 0x00' I want to write a single byte with the value 10 to the file. 回答1: You can just build a bytes object with that value: with open('my_file', 'wb') as f: f.write(bytes([10])) This works only in python3. If you replace bytes with bytearray it works in both python2 and 3. Also: remember to open the file in