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progress.py
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progress.py
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'''
A class that creates a text-based progress bar instance.
example progress bar object:
pb_ex = ProgressMeter(total=6000,unit='operations',ticks=25)
examples progress bar format:
[=========|---------------] 17% 22.5 operations/sec. 03 min 13 sec remaining
[=========================] 100% completed in 4 hours 42 min 17 sec
Licensed under the PSF License
source: http://code.activestate.com/recipes/473899-progress-meter/
credits:
2006-02-16 vishnubob: original code
2006-02-20 Denis Barmenkov: ANSI codes replaced by Backspace (0x08) characters
2010-05-17 Alexis Lopez: total time taken and time-to-completion estimation
------------------------------------------------------------------------------
Usage: from progress import ProgressMeter
'''
import sys
import time
class ProgressMeter(object):
def __init__(self, *args, **kw):
'''Initiates the progress bar object.'''
# What time do we start tracking our progress from?
self.timestamp = kw.get('timestamp', None)
# What kind of unit are we tracking?
self.unit = str(kw.get('unit', ''))
# Number of units to process
self.total = int(kw.get('total', 100))
# Number of units already processed
self.count = int(kw.get('count', 0))
# Refresh rate in seconds
self.rate_refresh = float(kw.get('rate_refresh', .5))
# Number of ticks in meter
self.meter_ticks = int(kw.get('ticks', 60))
self.meter_division = float(self.total) / self.meter_ticks
self.meter_value = int(self.count / self.meter_division)
self.last_update = None
self.rate_history_idx = 0
self.rate_history_len = 10
self.rate_history = [None] * self.rate_history_len
self.rate_current = 0.0
self.last_refresh = 0
self.prev_meter_len = 0
self.switch_off = False
self.estimated_duration = []
def update(self, count, *args, **kw):
'''Updates the progress bar internal counter by adding the value of the
"count" variable to the internal counter.'''
if not self.timestamp: self.timestamp = time.time()
now = time.time()
# Calculate rate of progress
rate = 0.0
# Add count to Total
self.count += count
self.count = min(self.count, self.total)
if self.last_update:
delta = now - float(self.last_update)
if delta:
rate = count / delta
else:
rate = count
self.rate_history[self.rate_history_idx] = rate
self.rate_history_idx += 1
self.rate_history_idx %= self.rate_history_len
cnt = 0
total = 0.0
# Average rate history
for rate in self.rate_history:
if rate == None:
continue
cnt += 1
total += rate
rate = total / cnt
if rate > 0:
self.estimated_duration.append((self.total - self.count) / rate)
self.rate_current = rate
self.last_update = now
# Device Total by meter division
value = int(self.count / self.meter_division)
if value > self.meter_value:
self.meter_value = value
if self.last_refresh:
if (now - self.last_refresh) > self.rate_refresh or (self.count >= self.total):
self._refresh()
else:
self._refresh()
def set(self, percentage, *args, **kw):
'''Sets the progress bar internal counter to a value such that the
percentage progress is close to the specified value of the
"percentage" variable.'''
if percentage < 100:
count = int((float(percentage) / 100) * self.total)
count = count - self.count
else:
self.count = self.total
count = 0
self.update(count)
def start(self, *args, **kw):
'''Sets the progress bar timestamp.
If this method is not called then ProgressMeter.update() or
ProgressMeter.set() automatically sets the progress bar timestamp on
its first usage. Does NOT override user specified __init__ settings
same as with ProgressMeter.update() or ProgressMeter.set()'''
if not self.timestamp:
self.timestamp = time.time()
def reset(self, *args, **kw):
'''Resets the progress bar to the initial settings with self.count
set to 0'''
# What time do we start tracking our progress from?
timestamp = kw.get('timestamp', None)
# What kind of unit are we tracking?
unit = str(kw.get('unit', self.unit))
# Number of units to process
total = int(kw.get('total', self.total))
# Number of units already processed
count = int(kw.get('count', 0))
# Refresh rate in seconds
rate_refresh = float(kw.get('rate_refresh', self.rate_refresh))
# Number of ticks in meter
meter_ticks = int(kw.get('ticks', self.meter_ticks))
self.__init__(timestamp=timestamp, unit=unit, total=total, count=count, rate_refres=rate_refresh,
ticks=meter_ticks)
def _get_meter(self, *args, **kw):
perc = (float(self.count) / self.total) * 100
bar = '=' * self.meter_value
if self.count >= self.total:
pad = '=' * (self.meter_ticks - self.meter_value)
# Time taken to completion
dur = time.time() - self.timestamp
# Converting into hours, minutes and seconds
hours, remainder = divmod(dur,3600)
minutes, seconds = divmod(remainder,60)
if dur < 60:
est = ' completed in %.f sec' % seconds
elif dur >= 60 and dur < 3600:
est = ' completed in %.f min %.f sec' % (minutes, seconds)
else:
if hours == 1:
est = ' completed in %.f hour %.f min %.f sec' % (hours, minutes, seconds)
else:
est = ' completed in %.f hours %.f min %.f sec' % (hours, minutes, seconds)
return ' [%s=%s] %d%%%s' % (bar, pad, perc, est)
else:
pad = '-' * (self.meter_ticks - self.meter_value)
if len(self.estimated_duration) >= 1:
# parameters to refine time-remaining estimation
if self.estimated_duration[-1] < 15: exp = 1.75; dat = 10
elif self.estimated_duration[-1] >= 15 and self.estimated_duration[-1] < 30: exp = 1.5; dat = 15
elif self.estimated_duration[-1] >= 30 and self.estimated_duration[-1] < 90: exp = 1.25; dat = 50
else: exp = 1.00; dat = 50
# Calculation of time-remaining estimation
wght_num, wght_den = (0 , 0)
for i in range(0,min(len(self.estimated_duration),dat)):
wght_num += self.estimated_duration[-dat:][i] * ((i+1)**exp)
wght_den += (i+1)**exp
est_dur = int(wght_num / wght_den)
# Converting into hours, minutes and seconds
hours, remainder = divmod(est_dur,3600)
minutes, seconds = divmod(remainder,60)
if est_dur < 60:
est = '%02.f sec' % seconds
elif est_dur >= 60 and est_dur < 3600:
est = '%02.f min %02.f sec' % (minutes, seconds)
else:
est = '%.f hr %02.f min %02.f sec' % (hours, minutes, seconds)
return ' [%s-%s] %d%% %s left' % (bar, pad, perc, est)
else:
return ' [%s-%s] %d%% Starting...' % (bar, pad, perc)
def _refresh(self, *args, **kw):
if self.switch_off:
return
else:
# Clear line and return cursor to start-of-line
sys.stdout.write(' ' * self.prev_meter_len + '\x08' * self.prev_meter_len)
# Get meter text
meter_text = self._get_meter(*args, **kw)
# Write meter and return cursor to start-of-line
sys.stdout.write(meter_text + '\x08'*len(meter_text))
self.prev_meter_len = len(meter_text)
# Are we finished?
if self.count >= self.total:
sys.stdout.write('\n')
# Switches off method refresh (equivalent to killing the meter)
# this is a safety measure in case of wrong usage where loops
# continue beyond ProgressMeter.set(100) or ProgressMeter.update(total)
self.switch_off = True
sys.stdout.flush()
# Timestamp
self.last_refresh = time.time()