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support initial value for start method. #3

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support initial value for start method. #3

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10 changes: 6 additions & 4 deletions progressbar/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -279,8 +279,9 @@ def update(self, value=None):
self.last_update_time = now


def start(self):
'''Starts measuring time, and prints the bar at 0%.
def start(self, initval=0):
'''Starts measuring time, initialize the progresbar at 0 (or the optional initval)
and prints the bar at the appropriate percentage.

It returns self so you can use it like this:
>>> pbar = ProgressBar().start()
Expand All @@ -298,12 +299,13 @@ def start(self):
self.next_update = 0

if self.maxval is not UnknownLength:
if self.maxval < 0: raise ValueError('Value out of range')
if self.maxval < 0 or initval > self.maxval:
raise ValueError('Value out of range')
self.update_interval = self.maxval / self.num_intervals


self.start_time = self.last_update_time = time.time()
self.update(0)
self.update(initval)

return self

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