格式字符串没有足够的参数 [英] Not enough arguments for format string

问题描述

我在Python中有这样的代码：

I have such code in Python:

def send_start(self, player):
    for p in self.players:
        player["socket"].send_cmd('<player id="%s" name="%s" you="%s" avatar="*.png" bank="%s" />'%(self.players.index(p)+1, p['name'], int(player["pid"]==p["pid"]), 0))
    player["socket"].send_cmd('<game playerid="%s" />'%(self.turnnow))
    player["socket"].send_cmd("<start />")

错误在这篇文章的标题中。什么是错误的？

And the error is in the title of this post. What's wrong?

推荐答案

如果 self.turnnow 是一个空元组：

Your code would fail if self.turnnow is an empty tuple:

>>> var = ()
>>> print "%s" % (var)
Traceback (most recent call last):
  File "<stdin>", line 2, in <module>
TypeError: not enough arguments for format string
>>> print "%s" % (var,)
()

如果元组只有一个元素，那么Python中的表达式不会自动成为一个元组。 （expr）相当于 expr 。 （expr，）相当于一个元素元组，它持有 expr 作为第一个元素。因此，请尝试在第二个 print 语句中在 self.turnnow 后添加逗号。

This is because a parenthesized expression in Python does not automatically become a tuple if the tuple would have only one element. (expr) is equivalent to expr. (expr, ) is equivalent to a one-element tuple holding expr as the first element. So, try adding a comma after self.turnnow in the second print statement.

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