not a long ago I came across weird thing with `if '' in lst`.
The code bellow gives me output:

```
1 - yes
2 - no
3 - yes

```

Can you tell me why `1` is `yes`?

```
########################################
if '' in ('a'):
    print('1 - yes')
else:
    print('1 - no')

########################################
if '' in ('a', 'b', 'c'):
    print('2 - yes')
else:
    print('2 - no')

########################################
if '' in (''):
    print('3 - yes')
else:
    print('3 - no')

```