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# 常用统计类函数的python实现

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```#!/usr/bin/env python
#  corestats.py (COREy STATS)
#  Copyright (c) 2006-2007, Corey Goldberg (corey@goldb.org)
#
#    statistical calculation class
#    for processing numeric sequences
#
#  license: GNU LGPL
#
#  This library is free software; you can redistribute it and/or
#  modify it under the terms of the GNU Lesser General Public
#  License as published by the Free Software Foundation; either
#  version 2.1 of the License, or (at your option) any later version.

import sys

class Stats:

def __init__(self, sequence):
# sequence of numbers we will process
# convert all items to floats for numerical processing
self.sequence = [float(item) for item in sequence]

def sum(self):
if len(self.sequence) < 1:
return None
else:
return sum(self.sequence)

def count(self):
return len(self.sequence)

def min(self):
if len(self.sequence) < 1:
return None
else:
return min(self.sequence)

def max(self):
if len(self.sequence) < 1:
return None
else:
return max(self.sequence)

def avg(self):
if len(self.sequence) < 1:
return None
else:
return sum(self.sequence) / len(self.sequence)

def median(self):
if len(self.sequence) < 1:
return None
else:
self.sequence.sort()
return self.sequence[len(self.sequence) // 2]

def stdev(self):
if len(self.sequence) < 1:
return None
else:
avg = self.avg()
sdsq = sum([(i - avg) ** 2 for i in self.sequence])
stdev = (sdsq / (len(self.sequence) - 1)) ** .5
return stdev

def percentile(self, percentile):
if len(self.sequence) < 1:
value = None
elif (percentile >= 100):
sys.stderr.write('ERROR: percentile must be < 100.  you supplied: %s\n'% percentile)
value = None
else:
element_idx = int(len(self.sequence) * (percentile / 100.0))
self.sequence.sort()
value = self.sequence[element_idx]
return value

# Sample script using this class:
# -------------------------------------------
#    #!/usr/bin/env python
#    import corestats
#
#    sequence = [1, 2.5, 7, 13.4, 8.0]
#    stats = corestats.Stats(sequence)
#    print stats.avg()
#    print stats.percentile(90)
# -------------------------------------------
```