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Schedule a Follow-Up from an Email Keyword — Automation For Explorers

Day 19 · ~12 min●

One keyword, one email, one new calendar event. You want the first matching email, and you want its snippet to become the event title. How do you find the first matching item in a list without iterating twice?

A generator expression inside next()? Like next((m for m in messages if keyword in m['snippet']), None) — or is there something simpler?

That's the sharp version. next() on a generator stops at the first match and takes a default if nothing matches — no full-list scan, no IndexError:

python

match = next(
    (m for m in messages if keyword.lower() in m.get("snippet", "").lower()),
    None,
)

And if match is None I early-return — otherwise I use its snippet as the event title?

Exactly the chain. Guard, extract, write — same skeleton as Day 17 with a filter on the read side:

python

def schedule_followup_from_email(keyword: str) -> str:
    emails = toolset.execute_action(Action.GMAIL_FETCH_EMAILS, {"max_results": 10})
    messages = emails.get("messages", [])
    match = next((m for m in messages if keyword.lower() in m.get("snippet", "").lower()), None)
    if match is None:
        return ""
    title = match.get("snippet", "")
    toolset.execute_action(Action.GOOGLECALENDAR_CREATE_EVENT, {"summary": f"Follow up: {title}"})
    return title

The event has no time — is that OK? Don't calendar events need a start and end?

The Composio create_event accepts just a summary and the API defaults the time to a reasonable slot — usually a short block today or tomorrow. If you need exact timing, add start and end params; for a "follow up later" nudge, summary-only is the most common call.

So one keyword walks my inbox and a calendar event gets born — that is the shape of every "turn an email into an action" script?

Filter, pick, write. This pattern works whether the target is a task, an event, a document, or a Slack message. Swap the write enum; the rest is cut-paste.

Find First, Act Once

TL;DR: next(generator, None) gives you the first match with a safe default — no crash on miss.

Filtered read — generator expression inside next()
Guarded write — if match is None: return ""
Write with context — summary=f"Follow up: {title}"

next vs comprehension

Goal	Use
First matching item	`next(gen, None)`
All matching items	`[x for x in xs if ...]`
Does any match	`any(... for x in xs)`

next() short-circuits on the first hit. Use it whenever you only need one result.

Day 19 · ~12 min●

A generator expression inside next()? Like next((m for m in messages if keyword in m['snippet']), None) — or is there something simpler?

That's the sharp version. next() on a generator stops at the first match and takes a default if nothing matches — no full-list scan, no IndexError:

python

match = next(
    (m for m in messages if keyword.lower() in m.get("snippet", "").lower()),
    None,
)

And if match is None I early-return — otherwise I use its snippet as the event title?

Exactly the chain. Guard, extract, write — same skeleton as Day 17 with a filter on the read side:

python

def schedule_followup_from_email(keyword: str) -> str:
    emails = toolset.execute_action(Action.GMAIL_FETCH_EMAILS, {"max_results": 10})
    messages = emails.get("messages", [])
    match = next((m for m in messages if keyword.lower() in m.get("snippet", "").lower()), None)
    if match is None:
        return ""
    title = match.get("snippet", "")
    toolset.execute_action(Action.GOOGLECALENDAR_CREATE_EVENT, {"summary": f"Follow up: {title}"})
    return title

The event has no time — is that OK? Don't calendar events need a start and end?

So one keyword walks my inbox and a calendar event gets born — that is the shape of every "turn an email into an action" script?

Filter, pick, write. This pattern works whether the target is a task, an event, a document, or a Slack message. Swap the write enum; the rest is cut-paste.

Find First, Act Once

TL;DR: next(generator, None) gives you the first match with a safe default — no crash on miss.

Filtered read — generator expression inside next()
Guarded write — if match is None: return ""
Write with context — summary=f"Follow up: {title}"

next vs comprehension

Goal	Use
First matching item	`next(gen, None)`
All matching items	`[x for x in xs if ...]`
Does any match	`any(... for x in xs)`

next() short-circuits on the first hit. Use it whenever you only need one result.

def schedule_followup_from_email(keyword: str) -> str: emails = toolset.execute_action(Action.GMAIL_FETCH_EMAILS, {"max_results": 10}) messages = emails.get("messages", []) match = next((m for m in messages if keyword.lower() in m.get("snippet", "").lower()), None) if match is None: return "" title = match.get("snippet", "") toolset.execute_action(Action.GOOGLECALENDAR_CREATE_EVENT, {"summary": f"Follow up: {title}"}) return title

Find First, Act Once

TL;DR: next(generator, None) gives you the first match with a safe default — no crash on miss.

Filtered read — generator expression inside next()

Guarded write — if match is None: return ""

Write with context — summary=f"Follow up: {title}"

next vs comprehension

Goal	Use
First matching item	`next(gen, None)`
All matching items	`[x for x in xs if ...]`
Does any match	`any(... for x in xs)`

next() short-circuits on the first hit. Use it whenever you only need one result.

Find First, Act Once

TL;DR: next(generator, None) gives you the first match with a safe default — no crash on miss.

Filtered read — generator expression inside next()

Guarded write — if match is None: return ""

Write with context — summary=f"Follow up: {title}"

next vs comprehension

Goal	Use
First matching item	`next(gen, None)`
All matching items	`[x for x in xs if ...]`
Does any match	`any(... for x in xs)`

next() short-circuits on the first hit. Use it whenever you only need one result.

Find First, Act Once

next vs comprehension

Find First, Act Once

next vs comprehension

Find First, Act Once

next vs comprehension

Sign up to practice

Find First, Act Once

next vs comprehension

Sign up to practice