python类型错误：can only concatenate list (not "str") to list

TypeError：can only concatenate list (not "str") to list：

类型错误：只能将list类型和list类型联系起来，而不是str类型；

解决方法：

（1）加入list用append添加。

（2）类似这样的写法：
"/".join([root_path,file_name]) 将需要加入的东西先连接起来，然后用[ ]组合.

举个例子：

project_path = 'Exercise'

current_path = os.path.dirname(os.path.abspath(project_path))  # 返回当前目录
path1 = current_path.split(project_path)
path2 = [path1[0],project_path]
log_path = path2 + current_time + '.log'
这样的代码是会抛出异常TypeError：can only concatenate list (not "str") to list
修改后的代码：

project_path = 'Exercise'
current_path = os.path.dirname(os.path.abspath(project_path))  # 返回当前目录
path1 = current_path.split(project_path)
path2 = [path1[0],project_path]
path3 = ""
log_name =  path3.join(path2) + '/logs/'  # 将需要加入的东西先连接起来
log_path = log_name + current_time + '.log'