关于python：将模块作为脚本执行

Executing modules as scripts

我现在在学Python，今天遇到了一个问题在里面http://docs.python.org/release/2.5.4/tut/node8.html网站

6.1.1 Executing modules as scripts

When you run a Python module with

python fibo.py

the code in the module will be executed, just as if you imported it, but with the
__name__ set to"__main__". That means that by adding this code at the end of
your module:

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if __name__ =="__main__":
import sys`
fib(int(sys.argv[1]))

you can make the file usable as a script as well as
an importable module, because the code
that parses the command line only runs
if the module is executed as the
"main" file:

$ python fibo.py 50 1 1 2 3 5 8 13 21
34

但当我在贝壳里做这个的时候，我

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File"<input>", line 1
python fibo.py 222
SyntaxError: invalid syntax

如何正确执行脚本？

FiBo.Py是

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def fib(n):
a,b=0,1
while b<n:
print b,
a,b = b,a+b

def fib2(n):
result=[]
a,b=0,1
while b<n:
result.append(b)
a,b=b,a+b
return result

if __name__ =="__main__":
import sys
fib(int(sys.argv[1]))