# -*- coding: utf-8 -*-#python 27#xiaodeng#统计一个文件中出现字符'a'的次数#http://www.cnblogs.com/hongten/p/hongten_python_count.htmlimport osnumber=0def getNumber(filePath,c):    'c---->the word numbers'    #统计一个文件中出现字符'a'的次数    if os.path.exists(filePath):        global number        with open(filePath,'r') as fp:            for line in fp:                countNumber=line.count(c)                number=number+countNumber    else:        print 'the path:[{}] is not exist!'.format(filePath)    #返回number数目    #return number if __name__=='__main__':    file_path='out.txt'    print getNumber(file_path,'xiaodeng')    #number为全局变量，可以直接进行输出操作    print number#将上面的案例进行一些修改操作：print '**'*20def getNumber(filePath,c):    import os    if os.path.exists(filePath):        number=0        with open(filePath,'r') as fp:            for line in fp:                countNumber=line.count(c)                number=number+countNumber        return number    else:        print 'the path:[{}] is not exist!'.format(filePath)if __name__=='__main__':    file_path='out.txt'    print getNumber(file_path,'xiaodeng')