readfile

问题 I would like to know is there a method that can read multiple lines from a file batch by batch. For example: with open(filename, 'rb') as f: for n_lines in f: process(n_lines) In this function, what I would like to do is: for every iteration, next n lines will be read from the file, batch by batch. Because one single file is too big. What I want to do is to read it part by part. 回答1: itertools.islice and two arg iter can be used to accomplish this, but it's a little funny: from itertools

问题 I would like to know is there a method that can read multiple lines from a file batch by batch. For example: with open(filename, 'rb') as f: for n_lines in f: process(n_lines) In this function, what I would like to do is: for every iteration, next n lines will be read from the file, batch by batch. Because one single file is too big. What I want to do is to read it part by part. 回答1: itertools.islice and two arg iter can be used to accomplish this, but it's a little funny: from itertools

问题 At the time we are trying to create an interface for serial communication, to be able to communicate with a microprocessor. Actually - everything works fine. Almost! To be able to communicate with our controller, we need to sync up with it. To do this, we write a string: "?0{SY}13!" , and the controller should then reply with "!0{SY}F5?" to accept the request for sync. To do this, we use a writeData function (that works - we know that by using echo ), and after that we use a readData to read

问题 At the time we are trying to create an interface for serial communication, to be able to communicate with a microprocessor. Actually - everything works fine. Almost! To be able to communicate with our controller, we need to sync up with it. To do this, we write a string: "?0{SY}13!" , and the controller should then reply with "!0{SY}F5?" to accept the request for sync. To do this, we use a writeData function (that works - we know that by using echo ), and after that we use a readData to read

问题 At the time we are trying to create an interface for serial communication, to be able to communicate with a microprocessor. Actually - everything works fine. Almost! To be able to communicate with our controller, we need to sync up with it. To do this, we write a string: "?0{SY}13!" , and the controller should then reply with "!0{SY}F5?" to accept the request for sync. To do this, we use a writeData function (that works - we know that by using echo ), and after that we use a readData to read

来源： https://stackoverflow.com/questions/63799981/read-specific-bytes-from-a-file-but-they-might-be-anywhere-in-the-file-vb-net

来源： https://stackoverflow.com/questions/29535973/is-it-necessary-to-close-files-after-reading-only-in-any-programming-language

问题 I am using the PHP readfile function to read a file and print it like so: print readfile ('anyfile') . This works, but the content length of the file is added at the end of the string also. Why? 回答1: readfile() prints out the contents itself and returns the content length -- you're effectively printing the contents with readfile and then printing the content length with print . Remove print and just use readfile('anyfile'); 来源： https://stackoverflow.com/questions/2733188/php-readfile-adds

问题 I have text file contain data like which contain key value pairs (Ann, 67) (Jhon, 78) (Mason, 89) (Simon, 34) (Ruko, 23) each item separated by space and there is a space after comma I want to read each element and print those item one by the (Ann, 67) (Jhon, 78) (Mason, 89) (Simon, 34) (Ruko, 23) I tried using while (fscanf(file, "%s", value) == 1) { printf(value); } but not it separated each value with comma (Ann, 67) (Jhon, 78) (Mason, 89) How can I do that 回答1: As I mentioned in my

问题 I have text file contain data like which contain key value pairs (Ann, 67) (Jhon, 78) (Mason, 89) (Simon, 34) (Ruko, 23) each item separated by space and there is a space after comma I want to read each element and print those item one by the (Ann, 67) (Jhon, 78) (Mason, 89) (Simon, 34) (Ruko, 23) I tried using while (fscanf(file, "%s", value) == 1) { printf(value); } but not it separated each value with comma (Ann, 67) (Jhon, 78) (Mason, 89) How can I do that 回答1: As I mentioned in my