Description

When using redirect_stdout=True, attempts to print() after finishing or otherwise write to sys.stdout are lost (not printed to console), unless finish() is called twice. It seems only the second finish call actually restores the old stdout.

Doesn't matter whether using context wrapper or not. If using context wrapper, you must call finish() inside the context to get stdout restored. If not using context wrapper, you must call finish twice.

Following example illustrates. Running this as is, you should see FINISH printed. If you remove that second p.finish() call, you won't see FINISH printed.

Code

import progressbar
import time
import sys

m = 24514315
p = progressbar.ProgressBar(
    widgets=[progressbar.Percentage(), progressbar.Bar()],
    max_value=m,
    redirect_stdout=True,
)

print("START")

for x in range(0, m, 8192):
    time.sleep(0.0001)
    p.update(x)

p.finish()
p.finish()   # why does it need another finish here?

# with progressbar.ProgressBar(
#         widgets=[progressbar.Percentage(), progressbar.Bar()],
#         max_value=m,
#         redirect_stdout=True) as p:
#     for x in range(0, m, 8192):
#         time.sleep(0.0001)
#         p.update(x)
#
#     p.finish()

print("FINISHED")

Versions

• Python version: 3.6.1 (x86-64)
• Python distribution/environment: CPython
• Operating System: Windows 10 x86-64
• Package version: 3.20.2