Update python parser

Now it can parse here:

```python
#This is line comment
def fibo(n, a):
    a = [1,2,3]
    while False:
        n = 1
    if n < 4 or n == 5:
        return 1
    else:
        return fibo(n-1) + fibo(n-2)

if __name__ == "__main__":
    fibo(10, [])
```