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

~~I have a question about format specifiers.~~
~~For example:~~
I have two variables that are called `animal` and `age`, and print them as a string in the console using format specifiers. Why do we place the modulo operator `%(animal,age)` next to the string without a comma? Does Python automatically detect that it needs two parameters to execute?
Here is the code example:
```
animal = "giraffe"
age = 25
print("A %s can live up to %d years" %(animal,age))
~~```~~

Suppose I have two variables that are called `animal` and `age`, and print them as a string in the console like so:
```
animal = "giraffe"
age = 25
print("A %s can live up to %d years" %(animal,age))
```
Why shouldn't there be a comma between the string and the `%(animal,age)` part? Does Python automatically detect that it needs two parameters to execute?

python format-string

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