I am the new to Python. Here is a problem that I have encountered.

Assume that there is a function called `set1(x)`.

Here is the code:

```
def set1(x):
    x = 1;

```

When I run this,

```
m = 5
set1(m)
m

```

the value of `m` is still 5.

So how should I code the function if I want the parameter to become 1 whenever I call the `set1()` function?