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'''
Utilities for showing progress bars, controlling default verbosity, etc.
'''
# If the tqdm package is not available, then do not show progress bars;
# just connect print_progress to print.
try:
from tqdm import tqdm, tqdm_notebook
except:
tqdm = None
default_verbosity = False
def verbose_progress(verbose):
'''
Sets default verbosity level. Set to True to see progress bars.
'''
global default_verbosity
default_verbosity = verbose
def tqdm_terminal(it, *args, **kwargs):
'''
Some settings for tqdm that make it run better in resizable terminals.
'''
return tqdm(it, *args, dynamic_ncols=True, ascii=True,
leave=(not nested_tqdm()), **kwargs)
def in_notebook():
'''
True if running inside a Jupyter notebook.
'''
# From https://stackoverflow.com/a/39662359/265298
try:
shell = get_ipython().__class__.__name__
if shell == 'ZMQInteractiveShell':
return True # Jupyter notebook or qtconsole
elif shell == 'TerminalInteractiveShell':
return False # Terminal running IPython
else:
return False # Other type (?)
except NameError:
return False # Probably standard Python interpreter
def nested_tqdm():
'''
True if there is an active tqdm progress loop on the stack.
'''
return hasattr(tqdm, '_instances') and len(tqdm._instances) > 0
def post_progress(**kwargs):
'''
When within a progress loop, post_progress(k=str) will display
the given k=str status on the right-hand-side of the progress
status bar. If not within a visible progress bar, does nothing.
'''
if nested_tqdm():
innermost = max(tqdm._instances, key=lambda x: x.pos)
innermost.set_postfix(**kwargs)
def desc_progress(desc):
'''
When within a progress loop, desc_progress(str) changes the
left-hand-side description of the loop toe the given description.
'''
if nested_tqdm():
innermost = max(tqdm._instances, key=lambda x: x.pos)
innermost.set_description(desc)
def print_progress(*args):
'''
When within a progress loop, post_progress(k=str) will display
the given k=str status on the right-hand-side of the progress
status bar. If not within a visible progress bar, does nothing.
'''
if default_verbosity:
printfn = print if tqdm is None else tqdm.write
printfn(' '.join(str(s) for s in args))
def default_progress(verbose=None, iftop=False):
'''
Returns a progress function that can wrap iterators to print
progress messages, if verbose is True.
If verbose is False or if iftop is True and there is already
a top-level tqdm loop being reported, then a quiet non-printing
identity function is returned.
verbose can also be set to a spefific progress function rather
than True, and that function will be used.
'''
global default_verbosity
if verbose is None:
verbose = default_verbosity
if not verbose or (iftop and nested_tqdm()) or tqdm is None:
return lambda x, *args, **kw: x
if verbose == True:
return tqdm_notebook if in_notebook() else tqdm_terminal
return verbose
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