feature request - throttle iterations per seconds

[superuser5]

• [y] I have visited the source website, and in particular
  read the known issues
• [y] I have searched through the issue tracker for duplicates
• [y] I have mentioned version numbers, operating system and
  environment, where applicable:

  import tqdm, sys
  print(tqdm.__version__, sys.version, sys.platform)

('4.32.2', '2.7.16 (default, Mar 4 2019, 09:02:22) \n[GCC 4.2.1 Compatible Apple LLVM 10.0.0 (clang-1000.11.45.5)]', 'darwin')

would be nice to add throttle to limit it/s, here the example:

from time import time, sleep
from tqdm import tqdm

fps=20
frameperiod=1.0/fps
now=time()
nextframe=now+frameperiod

for frame in tqdm(range(1020)):
do_something()
while now<nextframe:
sleep(nextframe-now)
now=time()
nextframe+=frameperiod

[casperdcl]

not sure if this is really something that tqdm should do. Your user code seems fine.

[casperdcl]

perhaps you could subclass tqdm adding this ability