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Is it possible to break a long line to multiple lines in Python?

python
prompt-engineering
best-practices
functions
Nikita BarsukovbyNikita Barsukov·Oct 16, 2024
TLDR

To break a long line in Python, use either backslashes (\), or parentheses (()). Here's how it goes with backslashes:

s = "part1" \ "part2"

Or you can use the parentheses approach for enhanced readability:

s = ("part1" "part2")

In both cases, the value remains a single-line string, and readability is boosted!

Break it down: Pythonic line management

When dealing with long lines in Python, use the right techniques at your disposal for a more structured and readable approach.

Parentheses to the rescue: Implicit line continuation

Implicit line continuation involves using parentheses ((), [], {}). This approach enhances readability and maintains an uncluttered syntax:

result = ( # A clean break, just like during lunchtime! some_function(parameter1, parameter2) + another_function(parameter3, parameter4) )

Rock the backslash: Explicit line continuation

When parentheses can't save the day, bring out the backslash (\) for explicit line continuation:

result = some_function(parameter1, parameter2) \ + another_function(parameter3, parameter4)

PEP 8: The style standard

PEP 8, the Python style guide, provides a set of style conventions for Python developers. According to PEP 8:

  • Continuation lines should have consistent indentations.
  • Break your line before a binary operator to enhance readability (Knuth's style).

The don'ts of line breaking

Avoid syntax errors caused by rogue spaces after the backslash and funny indentations:

# Incorrect: result = some_function(parameter1, parameter2) \ + another_function(parameter3, parameter4) # Space after backslash...oops! # Correct: result = some_function(parameter1, parameter2) \ + another_function(parameter3, parameter4) # Space no more!

Context-specific tools for line breaking

We adapt our line breaking techniques to suit the specific needs of our code:

The story of long strings

For long strings, consider either triple quotes (""") or implicit concatenation within parentheses. The result? Legibly and elegantly broken lines:

story = ( "This is the tale of a long Python line, coiling through an " "endless loop, seeking the embrace of parentheses." )

Juggling complex expressions

Enclose complex mathematical expressions or function calls to maintain logical flow:

total_sum = ((init_val1 + init_val2 - (init_val3 * init_val4)) + final_val1 - final_val2) # It's all adding up...

Comments are your friends

Use comments to clarify breaks, particularly if you're breaking a long line of code that's a bit cryptic:

# Hulk SMASH long line! monthly_interest = principal * (1 + (rate / 100)) ** period \ - principal # Hulk calm now...