Take every 3 lines as an element and store it in a tuple?

Question

I have the following content in a text file.

Subject: Security alert

From: Google <[email protected]>

To: [email protected]

Subject: Finish setting up your new Google Account

From: Google Community Team <[email protected]>

To: [email protected]

Subject: Security alert

From: Google <[email protected]>

To: [email protected]

I would like to store the first three lines in a tuple, and next 3 lines in an another tuple and so on, like below. [expected output]

['Subject: Security alert', 'From: Google <[email protected]>', 'To: [email protected]']
['Subject: Finish setting up your new Google Account', 'From: Google Community Team <[email protected]>', 'To: [email protected]']
['Subject: Security alert', 'From: Google <[email protected]>', 'To: [email protected]']

I tried with the following code, however I am missing in how to take "each line" rather than "each word" as I tried below.

with open('input.txt') as f:
     result = map(str.split, f)
     t = tuple(result)
     print(t)

# Unexpected output
(['Subject:', 'Security', 'alert'], [], ['From:', 'Google', '<[email protected]>'], [], ['To:', '[email protected]'], [], ['Subject:', 'Finish', 'setting', 'up', 'your', 'new', 'Google', 'Account'], [], ['From:', 'Google', 'Community', 'Team', '<[email protected]>'], [], ['To:', '[email protected]'], [], ['Subject:', 'Security', 'alert'], [], ['From:', 'Google', '<[email protected]>'], [], ['To:', '[email protected]'], [])

Look at the `grouper` function defined in the `itertools` documentation. — chepner, Jan 23 '20 at 18:23
The recipe for it is [here](https://docs.python.org/3/library/itertools.html#itertools-recipes). — martineau, Jan 23 '20 at 18:25
Does this answer your question? [How do you split a list into evenly sized chunks?](https://stackoverflow.com/questions/312443/how-do-you-split-a-list-into-evenly-sized-chunks) — AMC, Jan 23 '20 at 23:11

score 1 · Answer 1 · answered Jan 23 '20 at 18:35

This preserves the lines between. That why it grabs six lines instead of 3.

text="""Subject: Security alert

From: Google <[email protected]>

To: [email protected]

Subject: Finish setting up your new Google Account

From: Google Community Team <[email protected]>

To: [email protected]

Subject: Security alert

From: Google <[email protected]>

To: [email protected]"""


lines = text.split('\n')
emails=[]

while lines:
    bunch=lines[:6]
    (esubj,efrom,eto)=bunch[0],bunch[2],bunch[4]
    e=(esubj,efrom,eto)
    print(e)
    assert "ubject" in esubj and "rom" in efrom and "To:" in eto
    emails.append((e))
    lines=lines[6:]
print(emails)

As I see you've assumed the lines are only 6. But the number of lines may be more than 6 lines (e.g. 12 lines) — smc, Jan 23 '20 at 19:10
No, it works through a list of any length, taking up the first six lines at a time. 100 lines or more will work fine. — shanecandoit, Jan 23 '20 at 19:12

score 0 · Answer 2 · answered Jan 23 '20 at 18:35

Here You go

text = """Subject: Security alert

From: Google <[email protected]>

To: [email protected]

Subject: Finish setting up your new Google Account

From: Google Community Team <[email protected]>

To: [email protected]

Subject: Security alert

From: Google <[email protected]>

To: [email protected]"""


data = list(filter(bool, text.splitlines()))

def divide_data(l, n):
    for i in range(0, len(l), n):
        yield l[i:i + n]

result = list(divide_data(data, text.count('Subject:')))

Result:

[['Subject: Security alert', 'From: Google <[email protected]>', 'To: [email protected]'], ['Subject: Finish setting up your new Google Account', 'From: Google Community Team <[email protected]>', 'To: [email protected]'], ['Subject: Security alert', 'From: Google <[email protected]>', 'To: [email protected]']]

Take every 3 lines as an element and store it in a tuple?

2 Answers2