如何使用循环将列表中季数从字符串转为整数并替换原位置

原始数据 #

shows = [
["The Imperfects", "Science Fiction", "1", "entertaining"],
["Devil in Ohio", "Thriller", "1", "spooky"],
["The Crown", "Historical Drama", "4", "Powerful"],
["Narco-Saints", "Thriller", "1", "Entertaining"],
["In the Dark", "Crime Drama", "4", "intriguing"]]

方法1：直接遍历子列表修改 #

Python列表属于可变对象，遍历每个子列表时直接修改对应位置的元素，改动会同步到原列表中：

for show in shows:
    # 第三个元素的索引为2（从0开始计数），转成整数后替换原位置
    show[2] = int(show[2])

方法2：通过索引遍历修改 #

如果需要跟踪每个元素的位置，可以用索引遍历的方式：

for i in range(len(shows)):
    shows[i][2] = int(shows[i][2])

验证结果 #

执行上述任意一段代码后，打印shows即可看到季数已转为整数类型：

print(shows)
# 输出：
# [["The Imperfects", "Science Fiction", 1, "entertaining"],
#  ["Devil in Ohio", "Thriller", 1, "spooky"],
#  ["The Crown", "Historical Drama", 4, "Powerful"],
#  ["Narco-Saints", "Thriller", 1, "Entertaining"],
#  ["In the Dark", "Crime Drama", 4, "intriguing"]]

内容的提问来源于stack exchange，提问作者Prime DNA