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问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 4 years ago . Improve this question Why is a percent sign at the end of the output of the python script? $ echo "TEST TEST" | trim TESTTEST% #!/usr/bin/env python import sys if __name__ == "__main__": for line in sys.stdin: sys.stdout.write(''.join(line.split())) 回答1: The % you see there might actually be your

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 4 years ago . Improve this question Why is a percent sign at the end of the output of the python script? $ echo "TEST TEST" | trim TESTTEST% #!/usr/bin/env python import sys if __name__ == "__main__": for line in sys.stdin: sys.stdout.write(''.join(line.split())) 回答1: The % you see there might actually be your

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 4 years ago . Improve this question Why is a percent sign at the end of the output of the python script? $ echo "TEST TEST" | trim TESTTEST% #!/usr/bin/env python import sys if __name__ == "__main__": for line in sys.stdin: sys.stdout.write(''.join(line.split())) 回答1: The % you see there might actually be your

问题 This is a follow up question for write to output stream and returning value from shell script function. In shell script, echo can be used to return values from functions. But, if those functions want to print some messages. Then, this can be done by redirecting it to error stream. But when the script is used as a autosys job. then messages from logic functions ends up in error stream file triggering alerts. Is there any way, messages from logic function can be written to output stream and not

问题 This is a follow up question for write to output stream and returning value from shell script function. In shell script, echo can be used to return values from functions. But, if those functions want to print some messages. Then, this can be done by redirecting it to error stream. But when the script is used as a autosys job. then messages from logic functions ends up in error stream file triggering alerts. Is there any way, messages from logic function can be written to output stream and not

问题 In shell script, echo can be used to return values from functions. But, if those functions want to print some messages. Then, this can be done by redirecting it to error stream. Below is a simplified example :- #this is a function that returns a value, as well as #print some messages function logic(){ echo >&2 "start of logic" echo >&2 "perform logic, to get value" echo "ok" } function smain(){ local result=$(logic) echo "result is >$result<" if [ "$result" == "ok" ];then echo "script

问题 In shell script, echo can be used to return values from functions. But, if those functions want to print some messages. Then, this can be done by redirecting it to error stream. Below is a simplified example :- #this is a function that returns a value, as well as #print some messages function logic(){ echo >&2 "start of logic" echo >&2 "perform logic, to get value" echo "ok" } function smain(){ local result=$(logic) echo "result is >$result<" if [ "$result" == "ok" ];then echo "script

问题 I'm new to programming. I looked at tutorials for this, but I'm just getting more confused. But what I'm trying to do is use stdin and stdout to take in data, pass it through arguments and print out output results. So basically,on the command line, the user will input the and an argument. The arguments are: i = sys.argv [1] f = sys.argv [2] w = sys.argv [3] Then using if/else the program will execute some stuff based on which argument chosen above. i.e: On the command line the user will enter

问题 From http://www.cplusplus.com/reference/iostream/cout/: By default, most systems have their standard output set to the console, where text messages are shown, although this can generally be redirected. I've never heard of a system where stdout is anything other than a console window, by default or otherwise. I can see how redirecting it might be beneficial in systems where printing is an expensive operation, but that shouldn't be an issue in modern computers, right? 回答1: On most systems you

问题 I wondered whether it is possible to print (for example a string) in Python without the print function. This can be done by a command or by some trick. For example, in C there are printf and puts . Can someone show me a way to print or to deny this possibility? 回答1: sys.stdout.write("hello world\n") 回答2: import sys sys.stdout.write("hello") 回答3: You can use sys.stdout.write() Sometimes I find sys.stdout.write more convenient than print for printing many things to a single line, as I find the