file-read

问题 I have a question about Python 2.7 read/write csv file with ' utf-8-sig ' code, my csv . header is ['\xef\xbb\xbfID;timestamp;CustomerID;Email'] there have some code( "\xef\xbb\xbfID" ) I read from file A.csv and I want write the same code and header to file B.csv My print log is shows: ['\xef\xbb\xbfID;timestamp;CustomerID;Email'] But the actual output file header it looks like ÔªøID;timestamp Here is the code: def remove_gdpr_info_from_csv(file_path, file_name, temp_folder, original_header)

问题 I was trying to get the contents of sys.stdout in a string. I tried the obvious: def get_stdout(): import sys print('a') print('b') print('c') repr(sys.stdout) contents = "" #with open('some_file.txt','r') as f: #with open(sys.stdout) as f: for line in sys.stdout.readlines(): contents += line print(contents) but that gives the error: Exception has occurred: UnsupportedOperation not readable So how do I just change the permissions of that already opened file? I tried: sys.stdout.mode = 'r' but

问题 I was trying to get the contents of sys.stdout in a string. I tried the obvious: def get_stdout(): import sys print('a') print('b') print('c') repr(sys.stdout) contents = "" #with open('some_file.txt','r') as f: #with open(sys.stdout) as f: for line in sys.stdout.readlines(): contents += line print(contents) but that gives the error: Exception has occurred: UnsupportedOperation not readable So how do I just change the permissions of that already opened file? I tried: sys.stdout.mode = 'r' but

问题 I was trying to get the contents of sys.stdout in a string. I tried the obvious: def get_stdout(): import sys print('a') print('b') print('c') repr(sys.stdout) contents = "" #with open('some_file.txt','r') as f: #with open(sys.stdout) as f: for line in sys.stdout.readlines(): contents += line print(contents) but that gives the error: Exception has occurred: UnsupportedOperation not readable So how do I just change the permissions of that already opened file? I tried: sys.stdout.mode = 'r' but

问题 i am storing images on Linux EXTREME VPS using java when i store it on server path i'm getting is /var/sentora/hostdata/campusguru/public_html/resources/images/bharath.png reading the path using following code if(imagePath != null && imagePath.length() > 0 ) { byte fileContent[] = new byte[3000]; try (FileInputStream fin = new FileInputStream(new File(imagePath))) { //here the exception while(fin.read(fileContent) >= 0) { // Base64.encodeBase64(fileContent); } } imagePath = imagePath.replace(

问题 i am storing images on Linux EXTREME VPS using java when i store it on server path i'm getting is /var/sentora/hostdata/campusguru/public_html/resources/images/bharath.png reading the path using following code if(imagePath != null && imagePath.length() > 0 ) { byte fileContent[] = new byte[3000]; try (FileInputStream fin = new FileInputStream(new File(imagePath))) { //here the exception while(fin.read(fileContent) >= 0) { // Base64.encodeBase64(fileContent); } } imagePath = imagePath.replace(

问题 I am reading from file of format 1 32 43 23 32 43 123 43 54 243 123 2222 2 Here is my code snippet. string[100]; while(!feof(fp)) fgets(string,100,fp) Now, when I put every string, in the last string I am getting repetition and some more ambiguities (like something else also gets printed say 123 or so). How to solve this problem? 回答1: You need to check the return value of fgets. If a read has been successful, fgets returns the pointer to the buffer that you passed to it (i.e. string in your

问题 I need to do something where the file sizes are crucial. This is producing strange results filename = "testThis.txt" total_chars = 0 file = File.new(filename, "r") file_for_writing = nil while (line = file.gets) total_chars += line.length end puts "original size #{File.size(filename)}" puts "Totals #{total_chars}" like this original size 20121 Totals 20061 Why is the second one coming up short? Edit: Answerers' hunches are right: the test file has 60 lines in it. If I change this line total

问题 In a project, I have to read a file, and i have to work with the number of characters in a file, and is there a way to get number of characters without reading it character by character (otherwise i will have to read the file twice, once just to find the number of characters in it). Is it even possible? 回答1: You can try this: FILE *fp = ... /*open as usual*/; fseek(fp, 0L, SEEK_END); size_t fileSize = ftell(fp); However, this returns the number of bytes in the file, not the number of

问题 I am now trying to handle a large file (several GB), so I am thinking to use multi-thread. The file is multiple lines of data like: data1 attr1.1 attr1.2 attr1.3 data2 attr2.1 attr2.2 attr2.3 data3 attr3.1 attr3.2 attr3.3 I am thinking to use one thread read multiple lines first to a buffer1, and then one other thread to handle the data in buffer1 line by line, while the reading thread start to read file to buffer2. Then the handling thread continues when buffer2 is ready, and the reading