Python Example Code

Function Call Stack - Print

If you want to print function call stack on log function,
then just do following:

import inspect
print(str(inspect.stack()[1][1:4]) + ' ' + "Something to print")

In this example Python code, Stack depth is most important.
Stack depth [1] means that previous calling function frame(or context)

If you use some log api, then you may write like following example:


import inspect
def log_debug(self, msg):
    try:
        self.logger.debug(str(inspect.stack()[1][1:4]) + ' ' + "Something to print")

Log

Thread

try, except, else, finally

import socket
try:
    ip = socket.gethostbyname('daum.net')
except Exception as ex:
    print("Exception: type(%s)   %s" % (type(ex), ex.args))
    print("Exception: %s" % str(ex))
    exit()
else:
    print("IP Address: %s" % ip)
finally:
    print("Once again, IP Address: %s" % ip)

JSON Parser

#!/usr/bin/python3

try:
    import json
    from pprint import pprint

    output = '[{"name": "andrew", "nick": "peter", "location": "Seoul"}]'

    json_content = json.loads(output)
    pprint(json_content[0])
    print("\n My Location: %s" % json_content[0]["location"])
except Exception as ex:
    print("My Exception: %s" % str(ex))

TIME, DATE

Example Python code:
import time
import datetime

print("Form 1 = %s" % datetime.datetime.now())
print("Form 2 = %s" % time.strftime("%Y-%m-%d %H:%M:%S", time.gmtime(time.time())))

__file__ and os.path module package

Example Python code:
#!/usr/bin/python3

import os

print("__file__: %s" % __file__)
print("realpath: %s" % os.path.realpath(__file__))
print("dirname : %s" % os.path.dirname(os.path.realpath(__file__)))
print("abspath : %s" % os.path.abspath(os.path.dirname(os.path.realpath(__file__))))

Output:
__file__: ./aa.py
realpath: /root/andrew_test/python_example/aa.py
dirname : /root/andrew_test/python_example
abspath : /root/andrew_test/python_example

Popen

You can fork a process and get stream from the pipe of the process.
Example Python code:
import subprocess
import shlex

command = "ls -alh"
popen = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
(stdoutdata, stderrdata) = popen.communicate()

print("stdoutdata: %s" % stdoutdata)

print("stderrdata: %s" % stderrdata)