Mayaのヘルプラインにプログレスバーを出す時の便利クラス

example.py

from progress import Progress
from maya import cmds

sels = cmds.ls(sl=True)
progress = Progress(len(sels))

try:
  for sel in sels:
    progress.count()
    print(sel)
finally:
  progress.end()

progress.py

from maya import cmds
from maya import mel

class Progress(object):
    def __init__(self, max_count):
        bar = mel.eval('$tmp = $gMainProgressBar')
        self.bar = cmds.progressBar(
            bar,
            edit=True,
            beginProgress=True,
            status=u'Progress ...',
            minValue=0,
            maxValue=max_count,
            isInterruptable=False,
        )

    def count(self):
        cmds.progressBar(
            self.bar,
            edit=True,
            step=1,
        )

    def end(self):
        cmds.progressBar(
            self.bar,
            edit=True,
            endProgress=True
        )