# ATM
import sys withdraw, balance = map(float, sys.stdin.readline().strip().split()) # strip()用法去除结尾的\n符号 if int(withdraw) % 5 != 0 or balance < (withdraw + 0.5): # 1.注意手续费,缺少手续费也不能取 2.xy0~2000是测试值要求,不用判断
print("%.2f" % balance)
else:
print("%.2f" % (balance - withdraw - 0.5))

学习

  数据

    类型要求

      map转float

    精读输出

      "%.2f"

    读取

      sys标准库的引入, stdlib/io

      用split()一次读取两个

犯错

  \n尾部符号去掉

  py缩进注意

  0.5手续费

  中文字符混入犯错

  系统内含的测试数据规格,很多都不用自己多加一道判断了

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