itertools.groupby

[Jason Friedman]

I have a file such as:

$ cat my_data
Starting a new group
a
b
c
Starting a new group
1
2
3
4
Starting a new group
X
Y
Z
Starting a new group

I am wanting a list of lists:
['a', 'b', 'c']
['1', '2', '3', '4']
['X', 'Y', 'Z']
[]

I wrote this:
------------------------------------
#!/usr/bin/python3
from itertools import groupby

def get_lines_from_file(file_name):
    with open(file_name) as reader:
        for line in reader.readlines():
            yield(line.strip())

counter = 0
def key_func(x):
    if x.startswith("Starting a new group"):
        global counter
        counter += 1
    return counter

for key, group in groupby(get_lines_from_file("my_data"), key_func):
    print(list(group)[1:])
------------------------------------

I get the output I desire, but I'm wondering if there is a solution without
the global counter.
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