无法将int隐式更改为str

Question

我试图创建一个程序，要求用户输入上次看到哈雷彗星的年份，然后再加上75年和76年，然后输出结果。你知道吗

lastsight = int(input("When was the last sighting? "))
firstsight = lastsight + 75 
secondsight = lastsight + 76
print("The next sighting will be in", firstsight,  "or", secondsight + ".")

但是，无论何时运行它，都会出现以下错误：

Traceback (most recent call last):
File "program.py", line 5, in <module>
print("The next sighting will be in", firstsight,  "or", secondsight + ".")
TypeError: unsupported operand type(s) for +: 'int' and 'str'

如果能帮我修一下，我将不胜感激。你知道吗

Answer 1

使用以下选项：

print("The next sighting will be in", firstsight,  "or", str(secondsight) + ".")

正如您正确观察到的，python不会隐式地执行这些转换。你知道吗

Answer 2

试试这个：

print("The next sighting will be in {} or {}.".format(firstsight,  secondsight))