利用下划线将列表的每个元素拼接成字符串，li=["alex","eric","rain"]

利用下划线将列表的每个元素拼接成字符串，li=["alex","eric","rain"]

li=['alex', 'eric', 'rain']

c = li[0]

for k,n in enumerate(li[1:]):

    c += "_"+n
print(c)