Question

我已将文件调用helloworld.simon。在那里我写了：

Public class helloworld {
main = (main.method());
main {
    console.print("Hello World");
    }

我写了这段代码：

Public = ("Public")
Private = ("Private")
code = open('helloworld.simon' , 'r')
print(code.read())
if Public in code:
    print("Pub")
else:
    print("J")

输出是：

Public class helloworld {
main = (main.method());
main {
    console.print("Hello World");
    }

J

Answer 1

文件读取是顺序的。读取文件后（print(code.read())，您无法再次回读，除非重新开始阅读code.seek(0)

Public = ("Public")
Private = ("Private")
code = open('helloworld.simon' , 'r')
print(code.read())
code.seek(0)
if Public in code.read():
    print("Pub")
else:
    print("J")
code.close()

输出：

Pub

如果您评论code.seek(0)，则输出J

Answer 2

更改此行：

code = open('helloworld.simon' , 'r')

对此：

with open('helloworld.simon' , 'r') as f:
   lines = f.readlines()
   if any([line for line in lines if Public in line]):
      print("Pub")
   else:
      print("J")

Python如果变量中的变量

2 个答案: