lrq3000 · GitHub

I checked that redirection works correctly with this code (maybe we should add a unit test?):

from time import sleep
import contextlib
import sys
from tqdm import tqdm
class DummyTqdmFile(object):
    """Dummy file-like that will write to tqdm"""
    file = None
    def __init__(self, file):
        self.file = file
    def write(self, x):
        # Avoid print() second call (useless \n)
        if len(x.rstrip()) > 0:
            tqdm.write(x, file=self.file)
@contextlib.contextmanager
def stdout_redirect_to_tqdm():
    save_stdout = sys.stdout
    try:
        sys.stdout = DummyTqdmFile(sys.stdout)
        yield save_stdout
    # Relay exceptions
    except Exception as exc:
        raise exc
    # Always restore sys.stdout if necessary
    finally:
        sys.stdout = save_stdout
def blabla():
    print("Foo blabla")
# Redirect stdout to tqdm
with stdout_redirect_to_tqdm() as save_stdout:
        # tqdm call need to specify sys.stdout, not sys.stderr (default)
        # and dynamic_ncols=True to autodetect console width
        for _ in tqdm(range(3), file=save_stdout, dynamic_ncols=True):
            blabla()
            sleep(.5)
# After the `with`, printing is restored
print('Done!')

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