我一直在使用一些用于印刷诗歌的代码。该代码的目的是使边框适合诗歌的大小。但这与我的问题无关。我一直在尝试获取重新打印文件的代码，一行一行，但是ValueError: I/O operation on closed file.就是全部返回。
我试图通过关闭文件后重新打开文件，并在def poemprint(poem):函数完成后重新打开文件来解决此问题。但是两种方法都失败了。我不知道从这里去哪里。
import os
os.system("clear")
quitw=["no","n","ney","ne","nope","nuh-uh","nuh","noh","neigh","nye","negative","please no","no please","quit","stop","q","s"]
harlem=open("harlem.txt","r")
hhop=open("hhop.txt","r")
poems={"1":harlem,"2":hhop}
poemname={"1":"harlem.txt","2":"hhop.txt"}
#10 lines of def quit() code
def poemprint(poem):
print("╭"+"-"*60+"╮")
print("| Poem Printer [v0.5]"+" "*39+"|")
print("⊢"+"-"*60+"⊣")
print("|"+" "*60+"|")
for a in poem: #line where error occurs
b=57-len(a)
print("| "+a[0:len(a)-1]+(" "*b)+"|")
print("|"+" "*60+"|")
print("╰"+"-"*60+"╯")
poem.close()
if f=="harlem.txt": #doesn't work
harlem=open("harlem.txt","r")
elif f=="hhop.txt":
hhop=open("hhop.txt","r")
c=(input("Enter a Poem: "))
if c not in quitw:
while c not in quitw:
while c.lower() in poems:
os.system("clear")
f=poemname[c]
poemprint(poems[c])
c=(input("Enter a Poem: "))
if c in quitw:
quit()
else:
continue
os.system("clear")
print("Invalid input.")
c=(input("Enter a Poem: "))
else:
quit()
注意：quit（）是已定义的函数，用于完全停止代码。
这是我第二次问哈林诗之后应该看到的：
╭------------------------------------------------------------╮
| Poem Printer [v0.5] |
⊢------------------------------------------------------------⊣
| |
| Harlem by Langston Hughes |
| |
| What happens to a dream deferred? |
| |
| Does it dry up |
| like a raisin in the sun? |
| Or fester like a sore— |
| And then run? |
| Does it stink like rotten meat? |
| Or crust and sugar over— |
| like a syrupy sweet? |
| |
| Maybe it just sags |
| like a heavy load. |
| |
| Or does it explode? |
| |
╰------------------------------------------------------------╯
相反，我得到：
╭------------------------------------------------------------╮
| Poem Printer [v0.5] |
⊢------------------------------------------------------------⊣
| |
Traceback (most recent call last):
File "main.py",line 44, in <module>
poemsprint(poems[c])
File "main.py",line 27, in poemprint
for a in poem:
ValueError: I/O operation of closed file.
答案 0 :(得分：0)
您的步骤是：
harlem变量中打开文件poemprint参数调用harlem函数。此harlem在函数内部被引用为poem。poem所引用的文件（它是函数外部的harlem）harlem harlem作为关闭文件发生这种情况是因为harlem中的poemprint和外面的一个是不同的对象。
简短示例：
def a():
var = 2
var = 1
a()
print(var) #prints 1
您可以在mgilson's answer on a question that covers similar problem和the Python documentation中了解有关此内容的更多信息。
保留文件名，而不是打开文件。
poems={"1":"harlem.txt","2":"hhop.txt"}
然后修改函数以获取文件名作为参数，并打开函数内部的文件。
def poemprint(poem):
print("╭"+"-"*60+"╮")
print("| Poem Printer [v0.5]"+" "*39+"|")
print("⊢"+"-"*60+"⊣")
print("|"+" "*60+"|")
poem = open(poem, "r") #This
for a in poem:
b=57-len(a)
print("| "+a[0:len(a)-1]+(" "*b)+"|")
print("|"+" "*60+"|")
print("╰"+"-"*60+"╯")
poem.close()
#End of the function
现在应该可以了。
Enter a Poem: 1
╭------------------------------------------------------------╮
| Poem Printer [v0.5] |
⊢------------------------------------------------------------⊣
| |
| Roses are red |
| Violets are blue |
| |
╰------------------------------------------------------------╯
Enter a Poem: 1
╭------------------------------------------------------------╮
| Poem Printer [v0.5] |
⊢------------------------------------------------------------⊣
| |
| Roses are red |
| Violets are blue |
| |
╰------------------------------------------------------------╯
Enter a Poem:
这是完整的代码：
import os
os.system("clear")
quitw=["no","n","ney","ne","nope","nuh-uh","nuh","noh","neigh","nye","negative","please no","no please","quit","stop","q","s"]
poems={"1":"harlem.txt","2":"hhop.txt"}
#10 lines of def quit() code
def poemprint(poem):
print("╭"+"-"*60+"╮")
print("| Poem Printer [v0.5]"+" "*39+"|")
print("⊢"+"-"*60+"⊣")
print("|"+" "*60+"|")
poem = open(poem, "r") #This
for a in poem:
b=57-len(a)
print("| "+a[0:len(a)-1]+(" "*b)+"|")
print("|"+" "*60+"|")
print("╰"+"-"*60+"╯")
poem.close()
c=(input("Enter a Poem: "))
if c not in quitw:
while c not in quitw:
while c.lower() in poems:
os.system("clear")
f=poems[c]
poemprint(poems[c])
c=(input("Enter a Poem: "))
if c in quitw:
quit()
else:
continue
os.system("clear")
print("Invalid input.")
c=(input("Enter a Poem: "))
else:
quit()