README.md

Breaking up Long lines in Python with Parenthesis

Parenthesis without a trailing comma can be used to break up long lines into several lines for readability.

Long Single-lined version:

product_sellrates = shop_prod_compatibility.melt(["shop_id", "item_id", "customer_id", "Shop Name"]).dropna().reset_index(drop=True)

for col in very_long_name.dropna(axis=1, how="all").select_dtypes(include=[object]).columns:
  ...

Parenthesis version:

product_sellrates = (
  shop_prod_compatibility.melt(
    ["shop_id", "item_id", "customer_id", "Shop Name"]
  )
  .dropna()
  .reset_index(drop=True)
)

for col in (
  very_long_name.dropna(axis=1, how="all").select_dtypes(include=[object]).columns
):
  ...

Python does not allow you to break the line at the = without using parenthesis.

⚠️ Adding a trailing comma will make the result of the function call be wrapped in a tuple instead

An auto-formatter like black would do this automatically.

Tags:

#literature-notes #tips #clean-code #python