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print("%sDEF"%"ABC")
print("%d456%d"%(123,789))
a = "%d456%d"%(123,789)
print(a,end="\n\n")
print("{}DEF".format("ABC"))
print("{0}DEF".format("ABC"))
print("{}456{}".format(123,789))
print("{0}456{1}".format(123,789))
b = "{}456{}".format(123,789)
print(b)
运行结果: