how does scope work in python

1a = 5
2
3def f1():
4  a = 2
5  print(a)
6  
7print(a)   # Will print 5
8f1()       # Will print 2

1a = 5
2b = 3
3
4def f1():
5  a = 2
6  print(a)
7  print(b)
8  
9print(a)   # Will print 5
10f1()       # Will print 2 and 3