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Q&A Why are commas not needed for modulo string formatting when printing?

It is, as you said, an operator so it doesn't make any sense to place a comma somewhere between the operator and the two operands. The first operand is the template string, and the second operand ...

posted 1y ago by __blackjack__‭  ·  edited 1y ago by __blackjack__‭

Answer
#2: Post edited by user avatar __blackjack__‭ · 2023-02-27T16:05:49Z (about 1 year ago)
  • It is, as you said, an *operator* so it doesn't make any sense to place a comma somewhere between the operator and the two operands. The first operand is the template string, and the second operand is the tuple with the values to format into the template string. The `print()` function gets *one* argument — the result of the formatting operation.
  • Maybe it helps to bind the both operands to names, so the expression becomes a bit simpler:
  • ```python
  • animal = "giraffe"
  • age = 25
  • template = "A %s can live up to %d years"
  • values = (animal, age)
  • print(template % values)
  • ```
  • The `%` operator is syntactically no different than other binary operators like `+` or `/` and so on.
  • It is, as you said, an *operator* so it doesn't make any sense to place a comma somewhere between the operator and the two operands. The first operand is the template string, and the second operand is the tuple with the values to format into the template string. The `print()` function gets *one* argument — the result of the formatting operation.
  • Maybe it helps to bind both operands to names, so the expression becomes a bit simpler:
  • ```python
  • animal = "giraffe"
  • age = 25
  • template = "A %s can live up to %d years"
  • values = (animal, age)
  • print(template % values)
  • ```
  • The `%` operator is syntactically no different than other binary operators like `+` or `/` and so on.
#1: Initial revision by user avatar __blackjack__‭ · 2023-02-27T16:05:16Z (about 1 year ago)
It is, as you said, an *operator* so it doesn't make any sense to place a comma somewhere between the operator and the two operands.  The first operand is the template string, and the second operand is the tuple with the values to format into the template string.  The `print()` function gets *one* argument — the result of the formatting operation.

Maybe it helps to bind the both operands to names, so the expression becomes a bit simpler:
```python
animal = "giraffe"
age = 25
template = "A %s can live up to %d years"
values = (animal, age)
print(template % values)
```

The `%` operator is syntactically no different than other binary operators like `+` or `/` and so on.