[Gumstix-users] How do I embed a Python variable into a Linux command in Python?

[WSU_HARBOR <luz...@ho...>]

Using a Verdex Pro Gumstix:

Essentially, I want to run this command in Python to control a PCF8574
(I2C):

os.system('i2c 0x38 wb 0x38 0xff')    #this command works

However, I need to input a range of hex numbers (0x01 to 0xff) from a Python
variable.  Does anyone know how I can change the 0xff to a Python variable
that I can control?  

I think it runs along the lines of:

hex = 0xff

os.system('i2c 0x38 wb 0x38 "hex"')

I think I have the logic down, but I don't know how the Python code works
when dealing with embedded Linux commands.  Is there even a way to mix
Python with Linux commands like that?  Or, is there a better way to access
the I2C bus without using embedded linux commands?

Thank you

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