I am using Python 2.7 and wrote the following:

```

def arithmetic(A):
    x=1
"""
Some comments here
"""  
    if x=1:
        x=1
    elif x=2:
        x=2
    return 0

```

But it has the indentation issue:

```

    if x=1:
    ^
IndentationError: unexpected indent

```

So how to write comments in the function?