python - 全局名称“加入”未定义 django

Question

我正在使用以下

clear= join(('string', seed ,'Aviesta'));

它给了我错误：未定义全局名称“加入”。请帮助！

Answer 1

join是一个str方法，你需要在一个str实例上调用它：

In [31]: str.join??
Type:       method_descriptor
String Form:<method 'join' of 'str' objects>
Namespace:  Python builtin
Docstring:
S.join(iterable) -> string

Return a string which is the concatenation of the strings in the
iterable.  The separator between elements is S.

---

In [32]: ''.join(('string', 'seed' ,'Aviesta'))
Out[32]: 'stringseedAviesta'

In [33]: '_'.join(('string', 'seed' ,'Aviesta'))
Out[33]: 'string_seed_Aviesta'