#coding:utf8

def modify_variables(var1, var2):
    var1 = "bonjour"
    var2 = "j'ai changé de valeur"
    return (var1, var2)

data1 = "hello"
data2 = "world"

print("data1 = {} / data2 = {}".format(data1, data2))

(var1, var2) = modify_variables(data1, data2)

print("data1 = {} / data2 = {}".format(data1, data2))