ThreadIO, is good for capture stdout at multi-thread environment.
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ThreadIO, is good for capture stdout at multi-thread environment.
>>> # standard capture >>> from threadio import print_to_file >>> with print_to_file(TextIO()) as fp: ... print("hello world") ... >>> fp.getvalue() 'hello world\n'
>>> # standard capture (but not stdout, stderr) >>> from threadio import ThreadIO >>> fp = ThreadIO(TextIO()) >>> with fp.capture(TextIO()) as fp2: ... print("hello world", file=fp) ... with fp.capture(TextIO()) as fp3: ... print("hello world3", file=fp) ... # not captured fp3, stored fp2 ... print("fail captured", file=fp2) ... >>> fp.getvalue() '' >>> fp2.getvalue() 'hello world\nfail captured\n' >>> fp3.getvalue() 'hello world3\n'
>>> # thread example >>> from threading import Thread >>> from threadio import print_to_file >>> th = Thread(target=print, args=("hello world!",)) >>> with print_to_file(TextIO()) as fp: ... th.start() ... th.join() ... print("HAYO!") ... hello world! >>> fp.getvalue() # not capture other thread's print 'HAYO!\n'
>>> # note. print_to_xxx function change everything. >>> a = sys.stdout >>> with print_to_file(TextIO()): pass >>> b = sys.stdout >>> a is b False
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