python - 如何搁置整数键？

Question

我想在 shelve 中存储一个整数键。但是当我尝试在 shelve 中存储整数键时，它给我一个错误

Traceback (most recent call last):
  File "./write.py", line 12, in 
    data[id] = {"Id": id, "Name": name}
  File "/usr/lib/python2.5/shelve.py", line 124, in __setitem__
    self.dict[key] = f.getvalue()
  File "/usr/lib/python2.5/bsddb/__init__.py", line 230, in __setitem__
    _DeadlockWrap(wrapF)  # self.db[key] = value
  File "/usr/lib/python2.5/bsddb/dbutils.py", line 62, in DeadlockWrap
    return function(*_args, **_kwargs)
  File "/usr/lib/python2.5/bsddb/__init__.py", line 229, in wrapF
    self.db[key] = value
TypeError: Integer keys only allowed for Recno and Queue DB's

My Code :

#!/usr/bin/python

import shelve

data = shelve.open("data.txt")

ans = 'y'
while ans == "y":
    id = input("Enter Id : ")
    name = raw_input("Enter name : ")

    data[id] = {"Id": id, "Name": name}

    ans = raw_input("Do you want to continue (y/n) ? : ")

data.close()

是我的程序有问题还是 shelve 根本不支持整数键？

---

编辑 1:

在程序中，我试图将 Id 和 Name 的字典存储在另一个以 Id 作为键的字典中。然后尝试将其存储在文件中。

我是否需要将 Recno 或 Queue DB 与搁置一起使用？我是初学者，事情很困惑。

如果我的问题不清楚，请告诉我。

谢谢。

Answer 1

在您的示例中，数据库中的键始终是整数，因此将它们转换为字符串应该可以正常工作，

data[str(id)] = {"Id": id, "Name": name}

我的测试代码

def shelve_some_data(filename):
    db = shelve.open(filename, flag="c")
    try:
        # note key has to be a string
        db[str(1)]    = "1 integer key that's been stringified" 
        db[str(2)]    = "2 integer key that's been stringified" 
        db[str(3)]    = "3 integer key that's been stringified" 
        db[str(10)]   = "10 integer key that's been stringified" 
    finally:
        db.close()

def whats_in(filename):
    db = shelve.open(filename, flag="r")
    for k in db:
        print("%s : %s" % (k, db[k]))
    return

filename = "spam.db"
shelve_some_data(filename)
whats_in(filename)

和输出；它像字典一样工作，因此没有排序。

2 : 2 integer key that's been stringified
10 : 10 integer key that's been stringified
1 : 1 integer key that's been stringified
3 : 3 integer key that's been stringified