Python程序-1

斐波那契数列函数：

>>> def fib(n):    # write Fibonacci series up to n...     """Print a Fibonacci series up to n."""...     a, b = 0, 1...     while a < n:...         print(a, end=' ')...         a, b = b, a+b...     print()def fib2(n): # return Fibonacci series up to n    result = []    a, b = 0, 1    while b < n:        result.append(b)        a, b = b, a+b    return result

...>>> # Now call the function we just defined:... fib(2000)0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597

模块是包括 Python 定义和声明的文件。文件名就是模块名加上 .py 后缀。模块的模块名（做为一个字符串）可以由全局变量 __name__ 得到。导入模块:>>> import fibo通过模块名访问函数:>>> fib = fibo.fib>>> fib(500)1 1 2 3 5 8 13 21 34 55 89 144 233 377从被导入的模块中导入函数：>>> from fibo import *>>> from fibo import fib, fib2>>> fib(500)1 1 2 3 5 8 13 21 34 55 89 144 233 377