Module directory

[m]

Hello ,How are you I write a module as you see :

# Fibonacci numbers module
def fib(n): # write Fibonacci series up to n
a, b = 0, 1
while b < n:
print b,
a, b = b, a+b
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

the tutorials tells me to insert this module in the current 
directory I couldn't find the current directory ,where we should put 
our modules?
Sincerely yours Mohsena