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avoid string concatenation

Docs > Code Analysis > Static Analysis Rules > avoid string concatenation

Metadata

ID: python-best-practices/avoid-string-concat

Language: Python

Severity: Warning

Category: Performance

Description

Concatenation of multiple strings is not efficient and make the code hard to read and understand.

Instead of concatenating multiple strings, use an f-string or a format string.

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Non-Compliant Code Examples

"my" + awesome + "string"
plop = "super" + "awesome" + "text"

Compliant Code Examples

"my {0} string".format(awesome)
f"my {awesome} string"
plop = "superawesometext"

function(
    tags = (
    user_tags
    + s.get("tags", [])
    + [
        f"schedule_id:{s['_id']}",
        f"schedule_name:{s['schedule_name']}",
        f"git_ref:{schedule_git_ref}",
    ]
)
)

ROOT = Path("/tmp")
my_path = ROOT / "mydir" / "subdir"

How to use this rule

1
2
rulesets:
  - python-best-practices     # Rules to enforce Python best practices.

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