在字典中的For循环之后更新字典值

问题描述

我不太确定是否曾经问过这个问题，但是...将字典值添加到字典中的“值”后，我需要帮助来更新字典值。 请帮忙！

import csv

    with open('USVideos.csv', encoding="utf-8") as file:

    reader = csv.reader(file, delimiter=',')
    header = next(reader)
    youtube_usa_videos = []

    for row in reader:
        youtube_usa_videos.append(row)

Unique_channels = []
for list in youtube_usa_videos:
    if list[2] in Unique_channels:
        continue
    else:
        Unique_channels.append(list[2])
Like_per_channel = dict((channel, 0) for channel in Unique_channels)

for (key, value) in Like_per_channel.items():
    for list in youtube_usa_videos:
        if list[2] == key:
            value += int(list[7])
        else:
            continue
    print(Like_per_channel)

找到要增加的值的唯一键后，如何更新“ Like_per_channel.items（）”中的值？

谢谢！