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I'm not sure why you're converting to a string and then back to an int.

If you have an Int8, you should be able to call bin() on the data member directly:

# Import the Int8 message definition
from std_msgs.msg import Int8

# create an Int8 message and assign 32 to it
num = Int8()
num.data = 32

# call bin() on our Int8 data and print the result
print bin(num.data)

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