Question: I've been searching a lot but I can't find anything useful, the only answers I found were on how to change the opacity of an image using a .bat file. I just found out recently that you could change the opacity of the CMD window under properties, I want to know if you can do the same in a batch file using just a command.

Answer: 
There's no need to retrieve the key if you're only interested in the values:

In Python 2.x:

```
z = {'x':(123,"SE",2,1),'q':(124,"CI",1,1)}
for value in z.itervalues():
    if 'CI' in value:
        return value

```

In Python 3.x:

```
z = {'x':(123,"SE",2,1),'q':(124,"CI",1,1)}
for value in z.values():
    if 'CI' in value:
        return value

```
try this:

```
>>> z = {'x':(123,'SE',2,1),'z':(124,'CI',1,1)}
>>> list(filter(lambda x:'CI' in z.get(x),z))
['z']

```