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import os

my_list = [1,2,3]

foo = iter(my_list)

print foo

print foo.next()

print "counter----------------------------------------"

def counter(value):

print "Starting at", value

while value > 0:

yield value

value -= 1

foo = counter(5)

foo

for x in foo:

print x

foo = [x**2 for x in range(10000)]

print "dir_name----------------------------------------"

dir_name = 'E:\workspace\HelloPython\chapter7'

file_type = '.py'

for path, dirs, files in os.walk(dir_name):

print "path:", path

print "dirs:", dirs

print "file_type:", [f for f in files if f.endswith(file_type)]

print "end:", '_'*42

print "log_files----------------------------------------"

def log_files(dir_name, file_type):

if not os.path.exists(dir_name):

print "dir_name:", dir_name

raise ValueError(dir_name + "not found!")

if not os.path.isdir(dir_name):

raise ValueError(dir_name + "is not a directory!")

for path, dirs, files in os.walk(dir_name):

log_files = [f for f in files if f.endswith(file_type)]

for each_file in log_files:

yield os.path.join(path, each_file)

def log_lines(dir_name, file_type):

for each_file in log_files(dir_name, file_type):

for each_line in file(each_file).readlines():

yield (each_file, each_line.strip())

def list_errors(dir_name, file_type):

return (each_file + ': ' + each_line.strip()

for each_file, each_line in

log_lines(dir_name, file_type)

if 'error' in each_line.lower())

if __name__ == '__main__':

dir_name = 'E:/workspace/test'

file_type = '.log'

for each_file in log_files(dir_name, file_type):

print each_file

print "======================================="

for each_error in list_errors(dir_name, file_type):

print each_error