"There are three main alignment options in Python's string formatting: However, numbers have a fourth option =. On the surface, it looks like it doesn't do anything: x = 73 print(f"@{x:10}@") # @ 73@ print(f"@{x:=10}@") # @ 73@ But that's because = influences the alignment of the sign. If I make x negative, we already see something: x = -73 print(f"@{x:10}@") # @ -73@ print(f"@{x:=10}@") # @- 73@ So, the equals sign = aligns a number to the right but aligns its sign to the left. That may look weird, but I guess that's useful if you want to pad a number with 0s: x = -73 print(f"@{x:010}@") # @-000000073@"
"In fact, there is a shortcut for this type of alignment, which is to just put a zero immediately to the left of the width when aligning a number: x = -73 print(f"@{x:010}@") # @-000000073@ In fact, there is a shortcut for this type of alignment, which is to just put a zero immediately to the left of the width when aligning a number: x = -73 print(f"@{x:010}@") # @-000000073@ The zero immediately to the left changes the default alignment of numbers to be = instead of >. Become a better Python 🐍 developer, drop by drop 💧 Get a daily drop of Python knowledge. A short, effective tip to start writing better Python code: more idiomatic, more effective, more efficient, with fewer bugs. Subscribe here."
Python's '=' alignment option separates sign placement from digit alignment for numeric formatting. The sign is placed left while the numeric digits are right-aligned inside the field. Negative numbers show the sign at the left edge of the field with padding or zeros between the sign and digits. A leading zero in the width specifier (for example :010) activates '=' alignment and fills the space between sign and digits with zeros. This produces consistent digit alignment and clear sign visibility for padded numeric output.
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