str.format()引发KeyError [英] str.format() raises KeyError

问题描述

以下代码引发KeyError异常:

addr_list_formatted = []
addr_list_idx = 0

for addr in addr_list: # addr_list is a list
    addr_list_idx = addr_list_idx + 1
    addr_list_formatted.append("""
        "{0}"
        {
        "gamedir"  "str"
        "address"  "{1}"
        }
    """.format(addr_list_idx, addr))

为什么?

我正在使用Python 3.1.

I am using Python 3.1.

推荐答案

问题是您那里的{和}字符未指定格式化键.您需要将它们加倍，因此将代码更改为:

The problem is those { and } characters you have there that don't specify a key for formatting. You need to double them up, so change your code to:

addr_list_formatted.append("""
    "{0}"
    {{
    "gamedir"  "str"
    "address"  "{1}"
    }}
""".format(addr_list_idx, addr))

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