Show Current Time

1. Consider the following code, which import the datetime module to get the year,month,day,hour,minute,second of the current time.

   
   	# Demonstration of the datetime module
   	import datetime
   	d = datetime.datetime.today()
   	print(d.year, d.month, d.day)
   	print(d.hour, d.minute, d.second)
   
   

2. Suppose we save the code in a file "date.py", then you may run the program with the command "python date.py".
3. As a matter of fact, we can change the Python script to be "executable" by the following steps:
   1. Insert the following code at the beginning of "date.py".

      
      	#!/usr/local/bin/python
      
      

   2. The program would become

      
      	#!/usr/local/bin/python
      	# Demonstration of the datetime module
      	import datetime
      	d = datetime.datetime.today()
      	print(d.year, d.month, d.day)
      	print(d.hour, d.minute, d.second)
      
      

   3. Save the file.
   4. At the Unix prompt, type the command "chmod +x date.py".
   5. Now you may type the command "date.py" to run the program and see the result.
4. Modify your previous exercise about argv, so that when argc == 1, the program will automatically take the current year and month, instead of asking the user to input YYYY.MM.