python中join函数用法

str.join(list/tuple/dict/string)

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

list=['1','2','3','4','5']
print(''.join(list))

　　#结果：12345

seq = {'hello':'nihao','good':2,'boy':3,'doiido':4}
print('-'.join(seq))        #字典只对键进行连接

#结果：hello-good-boy-doiido