try expect

try 块允许您测试代码块以查找错误。

except 块允许您处理错误。

finally 块允许您执行代码，无论 try 和 except 块的结果如何。

多个异常 else finally

定义多个except
else:没有异常执行代码块
无论有没有except都会执行的代码块

try:
  print(x)
except NameError:
  print("Variable x is not defined")
except:
  print("Something else went wrong")
else:
  print("Nothing went wrong")
finally:
  print("The 'try except' is finished")

引发异常

raise 抛出异常

x = -1

if x < 0:
  raise Exception("Sorry, no numbers below zero")

命令行输入

input()

字符串格式化

多个值

只需要设置多个占位符{} ，占位符中可以加索引 {1}，{2}， 也可以命名{name},{ss}

myorder = "I have a {carname}, it is a {model}."
print(myorder.format(carname = "Porsche", model = "911"))