python - How do I format a string within a function call? -

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i want pass string variable string, in turn gets passwd onto function. had written code below:

not working

env = 'd' myfunction("checking processes a%s/b%s",'')% (env,env)

error 

myfunction("checking processes a%s/b%s",'')% (env,env) typeerror: unsupported operand type(s) %: 'nonetype' , 'tuple'

since code failed re-wrote below:

working 

env = 'd' str = "checking processes a%s/b%s" %(env,env) myfunction(str,'')

can suggest alternative shorter approaches ?ideally in lines of first attemp mean less loc.

myfunction("checking processes a%s/b%s" % (env,env),'')

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