Tell me please

Also what does t-=1 means if t is a variable

The len() function in Python returns you the number of elements in case of a list and returns the number of characters in case of a string.

```
$>>> A = [1, 2, 'a', 4, 10000]
$>>> len(A) = 3 #Number of elements in the list
$>>> string = 'Code Chef'
$>>> len(string) = 9 #Number of characters including space
```

t-=1 is the short notation for t = t - 1

`len(A)=5`

not `3`

.

@swetankmodi That’s technically not true. `-=`

(`__isub__`

) and `-`

(`__sub__`

) doesn’t have to be compatible with each other. I don’t know of a case in the standard libraries where it isn’t, but for the case of addition (`+=`

and `+`

) types like list behaves differently (`+`

combines into a new list, `+=`

is the same as extend). Similar things are true for `|`

and `&`

for set operations.

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