字符串转换为数组
str = '1,2,3'
arr = str.split(',')
数组转换为字符串
# 数组元素为字符串
arr = ['a','b']
str = ','.join(arr)
# 数组元素为数值
arr = [1,2,3]
str = ','.join(str(i) for i in arr)
str = '1,2,3'
arr = str.split(',')
# 数组元素为字符串
arr = ['a','b']
str = ','.join(arr)
# 数组元素为数值
arr = [1,2,3]
str = ','.join(str(i) for i in arr)