Idiomatic Style (PEP 8)

Python has a shared style guide called PEP 8. Following it makes your code read like everyone else's, which is the whole point: code is read far more often than it is written.

The naming conventions are the part you use every day:

• Variables and functions use snake_case: total_price, send_email.
• Constants use UPPER_SNAKE: MAX_RETRIES = 3.
• Classes use CapWords: ExpenseReport.
• Names should describe meaning, not type: users beats user_list.

A few more habits that mark code as Pythonic:

total = 0
for price in prices:
    total += price

# spaces around operators, no spaces inside brackets
result = (a + b) * 2
items = [1, 2, 3]

And prefer clear, direct expressions over clever ones. Compare:

# clunky
if len(names) > 0:
    has_names = True
else:
    has_names = False

# pythonic
has_names = len(names) > 0

You do not need to memorize the whole guide. Internalize the naming rules and the rest follows.