human
Can you provide a the Python code you requested given the following:
I am working on the file "01_introduction/intro_to_python.ipynb".
The first task is:
The keyword def introduces a function definition. It has to be followed by the function name and the paranthesized list of formal parameters.
Documentation strings
You should put a triple quoted string into the first line after the function definition, containing a description of the function. This is called docstring, and can be used to automatically produce documentation.
The return statement
It is simple to write a function that returns a list of the numbers of the Fibonacci series, instead of printing it:
Can you write Python code for it?
assistant
#Here is the Python code you requested.

def fib2(n): # return Fibonacci series up to n
    """Return a list containing the Fibonacci series up to n."""
    result = []
    a, b = 0, 1
    while a < n:
        result.append(a)
        a, b = b, a+b
    return result

f100 = fib2(100)    # call it
f100                # write the result