参数

#参数
# def len_func(s): #形参
#     count=0
#     for i in s:
#         count+=1
#     return count
#
# str1=input('>>>')
# str2=input('>>>')
# ret1=len_func(str1) #实参
# ret2=len_func(str2)
# print(ret1)
# print(ret2)

#写一个sum_func函数，求和
# def sum_func(a,b,c):
#     return a+b+c
# ret=sum_func(1,2,3)
# print(ret)

#写一个函数，传入2个参数，比较2个参数的大小，返回比较大的一个数值
# def max(a,b):
#     if a>b:
#         return a
#     else:
#         return b
#
# ret=max(12,34)
# print(ret)


#为什么写返回值    可以比较
# def len_func(s):
#     count = 0
#     for i in s:
#         count+=1
#     print(count)
#
# s1='hello'
# s2='wind'
# ret1=len_func(s1)
# ret2=len_func(s2)
# print(ret1)   #返回none
# print(ret2)
# print(ret1>ret2)#报错


def len_func(s):
    count = 0
    for i in s:
        count+=1
    return count

s1='hello'
s2='wind'

ret1=len_func(s1)
ret2=len_func(s2)
print(ret1>ret2)  #True