Python中文注釋問題

$ cat ex4.py   
#!/usr/bin/python  
  
#中文注釋  
#cars_num  
cars = 100  
#space_car_num  
space_in_a_car = 40  
drivers = 30  
passengers = 90  
cars_not_driven = cars - drivers  
cars_driven = drivers  
carpool_capacity = cars_driven * space_in_a_car  
average_passengers_per_car = passengers / cars_driven  
  
print "There are", cars, "cars available."  
print "There are only", drivers, "drivers available."  
print "There will be", cars_not_driven, "empty cars today."  
print "We can transport", carpool_capacity, "people today."  
print "We have", passengers, "to carpool today."  
print "We need to put about", average_passengers_per_car, "in each car."  
[wu@server python]$ ./ex4.py  
  File "./ex4.py", line 3  
SyntaxError: Non-ASCII character '\xe4' in file ./ex4.py on line 3, but no encoding declared; see http://www.python.org/peps/pep-0263.html for details

加上# -*- coding:utf-8 -*-之後就能成功使用中文注釋了

$ cat ex4.py   
#!/usr/bin/python  
# -*- coding:utf-8 -*-  
  
#中文注釋  
#cars_num  
cars = 100  
#space_car_num  
space_in_a_car = 40  
drivers = 30  
passengers = 90  
cars_not_driven = cars - drivers  
cars_driven = drivers  
carpool_capacity = cars_driven * space_in_a_car  
average_passengers_per_car = passengers / cars_driven  
  
print "There are", cars, "cars available."  
print "There are only", drivers, "drivers available."  
print "There will be", cars_not_driven, "empty cars today."  
print "We can transport", carpool_capacity, "people today."  
print "We have", passengers, "to carpool today."  
print "We need to put about", average_passengers_per_car, "in each car."  
[wu@server python]$ ./ex4.py   
There are 100 cars available.  
There are only 30 drivers available.  
There will be 70 empty cars today.  
We can transport 1200 people today.  
We have 90 to carpool today.  
We need to put about 3 in each car.