TypeError: can only concatenate str (not “int“) to str.

在python语言中出现"TypeError: can only concatenate str (not "int") to str"

person = {
    'first_name': 'willie',
    'last_name': 'matthes',
    'age': 8,
    'city': 'sitka',
}
name = person['first_name'].title() + " " + person['last_name'].title()
age = person['age']
city = person['city'].title()
print("nName: " + name)
print("Age: " + age)
print("City: " + city)

输出后出现如下图错误：

根据错误提示可明白是错误是“str”与“int”不一致导致的，所以加减运算符号左右变量类型要一致，

有两种修改方法：

        1.将“+”改为“，”

print("Age: ", age)

        2.将“age"变量由“int”类型改为“str”类型

age = str(person['age'])