SImple python print question
Hey there, I have a simple question about python print statement. Take the following code snippet for example... 1 print -#- executing: %s % section, 2 tests[section] = test.testcase(name=config.get(section,'name')) 3 tests[section].runTest() 4 printStatus(tests[section]) Now the problem is that line 1 does not get printed until line 4. What I thought would happen is that line 1 gets executed and the user sees that the statement that the test case is executing. Then after the test case executes a PASS or FAIL appears on the same line as the -#- executing: 0053 statement. e.g. -#- executing: 0053 FAIL Some tests take a long time to finish thus the screen is blank until the entire test finishes and the above statement is outputted. Thanks for any help. Amit -- http://mail.python.org/mailman/listinfo/python-list
Re: SImple python print question
[EMAIL PROTECTED] wrote: Hey there, I have a simple question about python print statement. Take the following code snippet for example... 1 print -#- executing: %s % section, 2 tests[section] = test.testcase(name=config.get(section,'name')) 3 tests[section].runTest() 4 printStatus(tests[section]) Now the problem is that line 1 does not get printed until line 4. What I thought would happen is that line 1 gets executed and the user sees that the statement that the test case is executing. Then after the test case executes a PASS or FAIL appears on the same line as the -#- executing: 0053 statement. e.g. -#- executing: 0053 FAIL Some tests take a long time to finish thus the screen is blank until the entire test finishes and the above statement is outputted. Thanks for any help. 'print' sends its output to sys.stdout, which is buffered, and may not be displayed immediately (because it's held in the buffer). To force the output to be displayed, use flush(): print -#- executing: %s % section, sys.stdout.flush() ...tests here... Hope this helps! --Hans -- http://mail.python.org/mailman/listinfo/python-list
Re: SImple python print question
On May 16, 6:38 pm, [EMAIL PROTECTED] wrote: Hey there, I have a simple question about python print statement. Take the following code snippet for example... 1 print -#- executing: %s % section, 2 tests[section] = test.testcase(name=config.get(section,'name')) 3 tests[section].runTest() 4 printStatus(tests[section]) Now the problem is that line 1 does not get printed until line 4. What I thought would happen is that line 1 gets executed and the user sees that the statement that the test case is executing. Then after the test case executes a PASS or FAIL appears on the same line as the -#- executing: 0053 statement. e.g. -#- executing: 0053 FAIL Some tests take a long time to finish thus the screen is blank until the entire test finishes and the above statement is outputted. Your standard output uses line-buffering, which means that the underlying I/O code stores all the output in memory until it gets a newline, only then does it send the output to the terminal (or console, or whatever). Workarounds to this are as follows: 1. Explicity flush the buffer after any print statements that end with a comma: print whatever, sys.stdout.flush() 2. Run Python in unbuffered mode, by using the -u switch: python -u yourscript.py Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: SImple python print question
On May 16, 4:02 pm, Hans Nowak [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote: Hey there, I have a simple question about python print statement. Take the following code snippet for example... 1 print -#- executing: %s % section, 2 tests[section] = test.testcase(name=config.get(section,'name')) 3 tests[section].runTest() 4 printStatus(tests[section]) Now the problem is that line 1 does not get printed until line 4. What I thought would happen is that line 1 gets executed and the user sees that the statement that the test case is executing. Then after the test case executes a PASS or FAIL appears on the same line as the -#- executing: 0053 statement. e.g. -#- executing: 0053 FAIL Some tests take a long time to finish thus the screen is blank until the entire test finishes and the above statement is outputted. Thanks for any help. 'print' sends its output to sys.stdout, which is buffered, and may not be displayed immediately (because it's held in the buffer). To force the output to be displayed, use flush(): print -#- executing: %s % section, sys.stdout.flush() ...tests here... Hope this helps! --Hans Thanks a lot! This worked beautifully! -- http://mail.python.org/mailman/listinfo/python-list
Re: SImple python print question
On May 16, 4:03 pm, Carl Banks [EMAIL PROTECTED] wrote: On May 16, 6:38 pm, [EMAIL PROTECTED] wrote: Hey there, I have a simple question about python print statement. Take the following code snippet for example... 1 print -#- executing: %s % section, 2 tests[section] = test.testcase(name=config.get(section,'name')) 3 tests[section].runTest() 4 printStatus(tests[section]) Now the problem is that line 1 does not get printed until line 4. What I thought would happen is that line 1 gets executed and the user sees that the statement that the test case is executing. Then after the test case executes a PASS or FAIL appears on the same line as the -#- executing: 0053 statement. e.g. -#- executing: 0053 FAIL Some tests take a long time to finish thus the screen is blank until the entire test finishes and the above statement is outputted. Your standard output uses line-buffering, which means that the underlying I/O code stores all the output in memory until it gets a newline, only then does it send the output to the terminal (or console, or whatever). Workarounds to this are as follows: 1. Explicity flush the buffer after any print statements that end with a comma: print whatever, sys.stdout.flush() 2. Run Python in unbuffered mode, by using the -u switch: python -u yourscript.py Carl Banks Thanks for the reply. This worked as expected. I did not know about the -u switch, this is good stuff. Amit -- http://mail.python.org/mailman/listinfo/python-list
