1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 4 age = 23 5 message = "happy " + age +"rd birthday!" #python无法识别age，所以执行结果报错 6 7 print(message) 8 9 执行结果为： 10 11 C:Users byAppDataLocalProgramsPythonPython37python.exe C:/py3/rumen_shijian/str().py 12 Traceback (most recent call last): 13 File "C:/py3/rumen_shijian/str().py", line 5, in <module> 14 message = "happy " + age +"rd birthday!" 15 TypeError: can only concatenate str (not "int") to str 16 17 进程已结束,退出代码1
1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 4 age = 23 5 message = "happy " + str(age) +"rd birthday!" #str()它让Python将非字符串值表示为字符串，所以能打印出age的值2和3 6 7 print(message) 8 9 10 11 执行结果为： 12 13 14 C:Users byAppDataLocalProgramsPythonPython37python.exe C:/py3/rumen_shijian/str().py 15 happy 23rd birthday! 16 17 进程已结束,退出代码0