#/usr/bin/envpythonsex=input("pleaseinputyoursex:")ifsex=="girl":print("alexis1b")==>空格表示缩进，表示一个域，官方建议四个空格elifsex=="man":print("alexis2b")else:print("alexis3b")

运行时出现：pleaseinputyoursex:girlalexissbpleaseinputyoursex:manalexis2b

please input your sex:ddgrdgg

alex is 3b