文件和终端上的Python输出

Python output on file and terminal(文件和终端上的Python输出)

问题描述

有时我希望我的程序在终端上写一些东西以供立即检查，并在一个文件中写下供以后使用，所以我写下了类似以下内容：

print "output"
file.write("output")   #the same output as the previous line

使用python2.6或7，是否有可能用另一种可能更智能的方式来完成这项工作？

推荐答案

您可以将其包装到一个函数中：

>>> def fprint(output):
...    print output
...    with open("somefile.txt", "a") as f:
...        f.write("{}
".format(output))

如果这是日志记录信息，您应该查看logging module。使用日志记录模块，您可以轻松配置和控制日志记录事件的多个目标。

logging cookbook中的示例：

import logging

# set up logging to file - see previous section for more details
logging.basicConfig(level=logging.DEBUG,
                    format='%(asctime)s %(name)-12s %(levelname)-8s %(message)s',
                    datefmt='%m-%d %H:%M',
                    filename='/temp/myapp.log',
                    filemode='w')
# define a Handler which writes INFO messages or higher to the sys.stderr
console = logging.StreamHandler()
console.setLevel(logging.INFO)
# set a format which is simpler for console use
formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s')
# tell the handler to use this format
console.setFormatter(formatter)
# add the handler to the root logger
logging.getLogger('').addHandler(console)

# Now, we can log to the root logger, or any other logger. First the root...
logging.info('Jackdaws love my big sphinx of quartz.'

# Now, define a couple of other loggers which might represent areas in your
# application:

logger1 = logging.getLogger('myapp.area1')
logger2 = logging.getLogger('myapp.area2')

logger1.debug('Quick zephyrs blow, vexing daft Jim.') # Won't print, file only
logger1.info('How quickly daft jumping zebras vex.') # Printed and to file
logger2.warning('Jail zesty vixen who grabbed pay from quack.') # Printed and to file
logger2.error('The five boxing wizards jump quickly.') # Printed and to file.

上面的示例将日志级别为logging.DEBUG或更高的所有消息写入名为/temp/myapp.log的文件。级别为logging.INFO的消息打印到sys.stderr。我极力主张将此模块用于简单调试打印上面的任何日志记录目的。

编辑：示例错误！

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