我已经检查了this问题,但在那里找不到答案。下面是一个说明我的情况下,使用一个简单的例子:IndexError:解析方法参数时元组索引超出范围
def log(*args):
message = str(args[0])
arguments = tuple(args[1:])
# message itself
print(message)
# arguments for str.format()0
print(arguments)
# shows that arguments have correct indexes
for index, value in enumerate(arguments):
print("{}: {}".format(index, value))
# and amount of placeholders == amount of arguments
print("Amount of placeholders: {}, Amount of variables: {}".format(message.count('{}'), len(arguments)))
# But this still fails! Why?
print(message.format(arguments))
log("First: {}, Second: {}, Third: {}, Fourth: {}", "asdasd", "ddsdd", "12312333", "fdfdf")
和输出:
First: {}, Second: {}, Third: {}, Fourth: {}
('asdasd', 'ddsdd', '12312333', 'fdfdf')
0: asdasd
1: ddsdd
2: 12312333
3: fdfdf
Amount of placeholders: 4, Amount of variables: 4
Traceback (most recent call last):
File "C:/Users/sbt-anikeev-ae/IdeaProjects/test-this-thing-on-python/test-this-thing.py", line 12, in <module>
log("First: {}, Second: {}, Third: {}, Fourth: {}", "asdasd", "ddsdd", "12312333", "fdfdf")
File "C:/Users/sbt-anikeev-ae/IdeaProjects/test-this-thing-on-python/test-this-thing.py", line 10, in log
print(message.format(arguments))
IndexError: tuple index out of range
PS:我用这样的方法(即包装str.format()
)已经拒绝了,因为它似乎是过剩的。但它仍令我困惑,为什么不按预期工作?
你是对的,但'arguments'是一个元组:) – ppasler
@ppasler,哎呀呀。当然,你是对的。 – user650881