##开发一个sum_2d的函数,函数能够实现两个数字的求和功能,使用sum_2()和sum_2(n1,n2)完成
def sum_2(n1=5,n2=10):
return n1+n2
print(sum_2()) #15
print(sum_2(4,8)) #12
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def sum_2_num():
num1 = 10
num2 = 20
result = num1 + num2
print("%d + %d = %d" % (num1, num2, result))
sum_2_num()
def sum_2_num(n1,n2):
result = n1 + n2
print("%d + %d = %d" % (n1, n2, result))
sum_2_num(10,30)