now.dayofyear SyntaxError: invalid character in identifier

这是一个 Python 语言中的语法错误。`now.dayofyear` 这个表达式并不是一个合法的 Python 标识符，因此会引起 `SyntaxError: invalid character in identifier` 错误。

如果你想获取当前日期是一年中的第几天，可以使用 `datetime` 模块中的 `timedelta` 和 `strftime` 函数。例如：

from datetime import datetime

now = datetime.now()
day_of_year = (now - datetime(now.year, 1, 1)).days + 1
print("Today is the {}th day of the year.".format(day_of_year))

这段代码会输出当天是今年的第几天。

相关问题

SyntaxError: invalid character in identifier

This error occurs when an identifier (such as a variable, function or class name) contains an invalid character.

An identifier in Python must start with a letter or underscore, and can only contain letters, underscores, and digits. It cannot contain spaces or special characters like @, #, $, %, etc.

For example, if you try to define a variable with a name that contains a space:

my variable = 42

This will result in a SyntaxError: invalid character in identifier, because variable names cannot contain spaces.

To fix this error, simply modify the identifier to remove the invalid character(s). For example:

my_variable = 42

Or:

myVariable = 42

syntaxerror: invalid character in identifier

"syntaxerror: invalid character in identifier" 意思是语法错误：标识符中无效字符。这通常是因为在标识符名称中使用了不允许的字符。如果你看到这个错误信息，请检查标识符的命名是否符合你使用的编程语言的规则。