[Python] How to split dataframe into multiple sub-dataframes based on column value

I got a dataframe df1 which looks like this:

Column1 Column2
13 1
12 1
15 0
16 0
15 1
14 1
12 1
11 0
21 1
45 1
44 0

The 1s indicate that a measurement started, I don't know how many 1s will be in one measurement and also don't know how many 0s will be in between two measurements. So what I want to yield are sub-dataframes, which are as long as I received a 1. So in my example it would be:

df2

Column1 Column2
13 1
12 1

df3

Column1 Column2
15 1
14 1
12 1

and df4

Column1 Column2
21 1
45 1

Alternatively, it would be acceptable to count up on Column2, so I can later split based on that value of Column2:

df5

Column1 Column2
13 1
12 1
15 0
16 0
15 2
14 2
12 2
11 0
21 3
45 3
44 0

I have no idea on how to approach this. Also with googling I could not find a proper approach. Thanks for any help.

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