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列表转换成字符串即:[1, 2, 3] -> 1,2,3
列表转换成字符串大家最先想到的肯定是下面的形式:直接用str()函数
。因为这种方式会把list1内部的空格也当做字符串来处理,如果书写不规范,导致内部空格多一个或者少一个,会造成最后结果的错误。所以这种方式不可取!!!
list1 = [1, 2, 3] ans = str(list1)[1:-1] print(ans) # '1, 2, 3'
常见的书写形式有以下几种:
1. 用for循环
ans = "" list1 = [1, 2, 3] for idx, li in enumerate(list1): if idx !=
len(list1) - 1: ans = ans + str(li) + "," else: ans += str(li) print(ans) #
1,2,3
2. 用map和join函数 (推荐)
使用map函数将list1内部元素转换成字符串格式,然后使用join拼接字符串
list1 = [1, 2, 3] ans = ",".join(map(str, list1)) print(ans) # 1,2,3