On 4/29/2017 7:41 PM, Jason Friedman wrote:
<---- start code ---->

import itertools

data = """Line1
Line2

Line4
Line5"""

def test_to_start(s):
     return "2" in s

for line in itertools.dropwhile(test_to_start, data.splitlines()):
     print(line)

<---- end code ---->

I expect:

$ python3 dropwhile.py
Line2

Line4
Line5


I get:

$ python3 dropwhile.py
Line1
Line2

Line4
Line5


Please explain.

'2' is not in the first line, so 'dropping' stops. Read the equivalent generator code in the doc.


--
Terry Jan Reedy

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