Python join()方法

描述

Python join() 方法用于将序列中的元素以指定的字符连接生成一个新的字符串。

语法

join()方法语法：

str.join(sequence)

参数

• sequence -- 要连接的元素序列。

返回值

返回通过指定字符连接序列中元素后生成的新字符串。

实例

以下实例展示了join()的使用方法：

#!/usr/bin/python

str = "-";
seq = ("a", "b", "c"); # 字符串序列
print str.join( seq );

以上实例输出结果如下：

a-b-c

实例2:

for field in obj._meta.fields:
        if update_fields is not None and field.name not in update_fields:
            continue
        property_name = ''.join(x.capitalize() for x in field.name.split('_'))
        property_name = property_name[0].lower() + property_name[1:]
        if property_name in src_obj:
            value = src_obj[property_name]
            if value is not None and value != '':
                tp = type(field)
                if tp in (IntegerField, BigIntegerField) and 
                        is_int(value):
                    setattr(obj, field.name, int(value))
                elif tp in (DecimalField, ) and is_decimal(value):
                    setattr(obj, field.name, float(value))
                elif tp in (CharField, ):
                    # 如果是个数组，则需要合并数组
                    if isinstance(value, list):
                        setattr(obj, field.name, u','.join(unicode(v) for v in value))
                    else:
                        setattr(obj, field.name, value[:field.max_length])
                elif tp in (TextField, ):
                    setattr(obj, field.name, value)
                elif tp in (DateField, ):
                    setattr(obj, field.name, datetime.datetime.strptime(value, MTIME_DATE_FORMAT))
                elif tp in (DateTimeField, ):
                    setattr(obj, field.name, datetime.datetime.strptime(value, MTIME_DATETIME_FORMAT))
                elif tp in (ForeignKey, ):
                    setattr(obj, field.name, value)
    return obj