常用Python日期、日志、获取内容循环的代码片段
近段时间对shell脚本和Python进行了梳理，将一些脚本中常用的内容，考虑多种方法整理出来，形成有用的代码片段，这样就可以在需要的时候直接使用，也可以用于备忘和思考。
本次整理的代码片段有： python中日期、时间常用获取方法； 记录处理日志的logging模块使用；从目录，文件，命名结果中，获取循环条件进行循环。
我将这些有用的代码片段整理在一个Python脚本中了，并且测试可用。
脚本内容如下：
#!/usr/bin/env python
#_*_coding:utf8_*_
#常用日期和时间
import datetime,time
today = datetime.date.today()
yesterday = datetime.date.today() - datetime.timedelta(days=1)
tomorrow = datetime.date.today() + datetime.timedelta(days=1)
Today_nyr = int(datetime.datetime.strftime(today, '%Y%m%d'))
Yesterday_nyr = int(datetime.datetime.strftime(yesterday, '%Y%m%d'))
Tomorrow_nyr = int(datetime.datetime.strftime(tomorrow ,'%Y%m%d'))
time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time()))
print "now time is {time}".format(time=time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time())))
print "normal type , today is {today} , yesterday is {yesterday} , tomorrow is {tommorrow} .".format(today=today,yesterday=yesterday,tommorrow=tomorrow)
print "nyr style , today is {today} , yesterday is {yesterday} , tommrrow is {tommorrow} .".format(today=Today_nyr,yesterday=Yesterday_nyr,tommorrow=Tomorrow_nyr)
#logging.info("now time is {time}".format(time=time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time()))))
#logging.info("normal type , today is {today} , yesterday is {yesterday} , tomorrow is {tommorrow} .".format(today=today,yesterday=yesterday,tommorrow=tomorrow))
#logging.info("nyr style , today is {today} , yesterday is {yesterday} , tommrrow is {tommorrow} .".format(today=Today_nyr,yesterday=Yesterday_nyr,tommorrow=Tomorrow_nyr))
###程序日志模块logging使用
import logging
import os
THISFILEPATH = os.path.dirname(os.path.realpath(__file__))
logfile = '{path}/python_test_file.log'.format(path=THISFILEPATH)
logging.basicConfig(level=logging.DEBUG,
format='%(asctime)s - %(filename)s - [line:%(lineno)d] %(levelname)s: %(message)s',
datefmt='%Y-%m-%d %H:%M:%S %p',
filename=logfile,
#level=10,
filemode='a')
logging.info("This is a info.\n")
logging.warn("This is a warning.\n")
logging.error("This is a error.\n")
#logging.log("This is a log. \n\n")
logging.debug("This is a debug. \n\n")
logging.critical("This is a critical \n\n\n")
logging.info("now time is {time}".format(time=time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time()))))
logging.info("normal type , today is {today} , yesterday is {yesterday} , tomorrow is {tommorrow} .".format(today=today,yesterday=yesterday,tommorrow=tomorrow))
logging.info("nyr style , today is {today} , yesterday is {yesterday} , tommrrow is {tommorrow} .".format(today=Today_nyr,yesterday=Yesterday_nyr,tommorrow=Tomorrow_nyr))
###从一个目录中，取出所有文件名进行循环
from subprocess import call
File_Dir = "/tmp"
File_List = os.listdir(File_Dir)
for f in File_List:
if( f[0] == '.' ):
continue
else:
logging.info("{filename}".format(filename=f))
###读取一个文件的多行，进行循环
#文件读取方法一：
file = open("/tmp/3.txt")
while 1:
line = file.readline()
if not line:
break
logging.info("this line is :{line}".format(line=line))
#文件读取方法二：
import fileinput
for line in fileinput.input("/tmp/3.txt"):
logging.info("this line is :{line} .".format(line=line))
#文件读取方法三：
file = open("/tmp/3.txt")
for line in file:
logging.info("this line is :{line} .".format(line=line))
###获取一个shell命令执行结果，进行循环
#获取命令方法一：
import subprocess
shell_cmd = "df -h | awk '{print $1}'"
p = subprocess.Popen("{cmd}".format(cmd=shell_cmd), shell=True, stdout=subprocess.PIPE)
out = p.stdout.readlines()
for line in out:
print line.strip()
logging.info(" file system is :{line} .".format(line=line.strip()))
#获取命令方法二：
for line in subprocess.Popen("df -h | awk '{print $1}'",shell=True,stdout=subprocess.PIPE).stdout.readlines():
print line.strip()
logging.info(" file system is :{line} .".format(line=line.strip()))
上面的脚本，可使用 python 3.py 直接执行。
脚本执行结果如下：
2017-03-02 16:48:43 PM - 3.py - [line:38] INFO: This is a info.
2017-03-02 16:48:43 PM - 3.py - [line:39] WARNING: This is a warning.
2017-03-02 16:48:43 PM - 3.py - [line:40] ERROR: This is a error.
2017-03-02 16:48:43 PM - 3.py - [line:42] DEBUG: This is a debug.
2017-03-02 16:48:43 PM - 3.py - [line:43] CRITICAL: This is a critical
2017-03-02 16:48:43 PM - 3.py - [line:46] INFO: now time is 2017-03-02 16:48:43
2017-03-02 16:48:43 PM - 3.py - [line:47] INFO: normal type , today is 2017-03-02 , yesterday is 2017-03-01 , tomorrow is 2017-03-03 .
2017-03-02 16:48:43 PM - 3.py - [line:48] INFO: nyr style , today is 20170302 , yesterday is 20170301 , tommrrow is 20170303 .
2017-03-02 16:48:43 PM - 3.py - [line:60] INFO: 40001501_20170302.csv
2017-03-02 16:48:43 PM - 3.py - [line:60] INFO: proc_cpu_result
2017-03-02 16:48:43 PM - 3.py - [line:60] INFO: qaucli_022317-18_15_41.log
2017-03-02 16:48:43 PM - 3.py - [line:60] INFO: sfcbHttpSocket
2017-03-02 16:48:43 PM - 3.py - [line:60] INFO: 1.py
2017-03-02 16:48:43 PM - 3.py - [line:60] INFO: sfcbLocalSocket
2017-03-02 16:48:43 PM - 3.py - [line:60] INFO: 2.txt
2017-03-02 16:48:43 PM - 3.py - [line:60] INFO: null
2017-03-02 16:48:43 PM - 3.py - [line:60] INFO: 3.txt
2017-03-02 16:48:43 PM - 3.py - [line:60] INFO: 3.py
2017-03-02 16:48:43 PM - 3.py - [line:60] INFO: hsperfdata_root
2017-03-02 16:48:43 PM - 3.py - [line:60] INFO: updatehbaconf.sh.log
2017-03-02 16:48:43 PM - 3.py - [line:60] INFO: proc_cpu_detail.txt
2017-03-02 16:48:43 PM - 3.py - [line:60] INFO: python_test_file.log
2017-03-02 16:48:43 PM - 3.py - [line:69] INFO: this line is :1
2017-03-02 16:48:43 PM - 3.py - [line:69] INFO: this line is :2
2017-03-02 16:48:43 PM - 3.py - [line:69] INFO: this line is :3
2017-03-02 16:48:43 PM - 3.py - [line:69] INFO: this line is :4
2017-03-02 16:48:43 PM - 3.py - [line:69] INFO: this line is :5
2017-03-02 16:48:43 PM - 3.py - [line:69] INFO: this line is :6
2017-03-02 16:48:43 PM - 3.py - [line:69] INFO: this line is :7
2017-03-02 16:48:43 PM - 3.py - [line:69] INFO: this line is :8
2017-03-02 16:48:43 PM - 3.py - [line:69] INFO: this line is :9
2017-03-02 16:48:43 PM - 3.py - [line:74] INFO: this line is :1
.
2017-03-02 16:48:43 PM - 3.py - [line:74] INFO: this line is :2
.
2017-03-02 16:48:43 PM - 3.py - [line:74] INFO: this line is :3
.
2017-03-02 16:48:43 PM - 3.py - [line:74] INFO: this line is :4
.
2017-03-02 16:48:43 PM - 3.py - [line:74] INFO: this line is :5
.
2017-03-02 16:48:43 PM - 3.py - [line:74] INFO: this line is :6
.
2017-03-02 16:48:43 PM - 3.py - [line:74] INFO: this line is :7
.
2017-03-02 16:48:43 PM - 3.py - [line:74] INFO: this line is :8
.
2017-03-02 16:48:43 PM - 3.py - [line:74] INFO: this line is :9
.
2017-03-02 16:48:43 PM - 3.py - [line:79] INFO: this line is :1
.
2017-03-02 16:48:43 PM - 3.py - [line:79] INFO: this line is :2
.
2017-03-02 16:48:43 PM - 3.py - [line:79] INFO: this line is :3
.
2017-03-02 16:48:43 PM - 3.py - [line:79] INFO: this line is :4
.
2017-03-02 16:48:43 PM - 3.py - [line:79] INFO: this line is :5
.
2017-03-02 16:48:43 PM - 3.py - [line:79] INFO: this line is :6
.
2017-03-02 16:48:43 PM - 3.py - [line:79] INFO: this line is :7
.
2017-03-02 16:48:43 PM - 3.py - [line:79] INFO: this line is :8
.
2017-03-02 16:48:43 PM - 3.py - [line:79] INFO: this line is :9
.
2017-03-02 16:48:43 PM - 3.py - [line:90] INFO: file system is :Filesystem .
2017-03-02 16:48:43 PM - 3.py - [line:90] INFO: file system is :/dev/sda2 .
2017-03-02 16:48:43 PM - 3.py - [line:90] INFO: file system is :tmpfs .
2017-03-02 16:48:43 PM - 3.py - [line:90] INFO: file system is :/dev/sda1 .
2017-03-02 16:48:43 PM - 3.py - [line:90] INFO: file system is :/dev/sda5 .
2017-03-02 16:48:43 PM - 3.py - [line:96] INFO: file system is :Filesystem .
2017-03-02 16:48:43 PM - 3.py - [line:96] INFO: file system is :/dev/sda2 .
2017-03-02 16:48:43 PM - 3.py - [line:96] INFO: file system is :tmpfs .
2017-03-02 16:48:43 PM - 3.py - [line:96] INFO: file system is :/dev/sda1 .
2017-03-02 16:48:43 PM - 3.py - [line:96] INFO: file system is :/dev/sda5 .