运行程序时如何存储信息

Question

运行时如何在python中存储信息？

这是代码:

list = [""]
plist = raw_input("What do you want to append: ")
list.append(plist)
print list

当它运行时:

What do you want to append: Hello
Hello

现在让我们说我离开去吃饭然后回来,我运行程序:

What do you want to append: People
People

问题是该程序没有存储Hello这个词并保留了People.如何让python存储我在raw_input存储中写的所有信息呢？

Answer 1

要使信息在执行过程中保持不变,您应该将其保存到文件中.这是编程语言的标准 - 变量存储在内存(RAM)中,并在每次执行时重置.

最重要的是,在您的示例中,您显式创建了一个要追加的空列表.要附加到之前创建的列表,请将该列表保存到文件中,然后根据该文件的内容创建列表.

# This opens the file and reads each line into the list, then closes it
file=open('listfile.txt','r')
list = file.readlines()
file.close()

plist = raw_input("What do you want to append: ")
list.append(plist)

# This opens the file, writes each item in the list to a line and then closes it    
file=open('listfile.txt','w')
for item in list:
    file.write(str(item))
file.close()

print (list)