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#named indexes:
txt1 = "My name is {fname}, I'm {age}".format(fname = "John", age = 36)
#numbered indexes:
txt2 = "My name is {0}, I'm {1}".format("John",36)
#empty placeholders:
txt3 = "My name is {}, I'm {}".format("John",36)
print(txt1)
print(txt2)
print(txt3)
My name is John, I'm 36
My name is John, I'm 36
My name is John, I'm 36