Python中使用list.remove移除指定字符串报错ValueError的问题排查请求

嘿，我一眼就看出问题出在哪了——你用错了split()的用法！

你原来的代码里，y = x.split()是默认按空格分割字符串，但你的每个uri都是连续的长字符串（比如spotify:playlist:37i9dQZF1DXcBWIGoYBM5M），根本没有空格，所以y其实是一个只包含原完整字符串的单元素列表。这时候你调用y.remove('spotify:playlist:')，自然会报错，因为列表里根本没有这个单独的前缀字符串，只有一整个长串。

给你几个简单高效的解决办法，都能拿到你想要的播放列表ID：

方法1：字符串替换（最直观） #

直接把前缀spotify:playlist:替换成空字符串就行，代码简洁易懂：

spotify_data = {'uri':['spotify:playlist:37i9dQZF1DXcBWIGoYBM5M', 'spotify:playlist:37i9dQZF1DX0XUsuxWHRQd', 'spotify:playlist:37i9dQZF1DX1lVhptIYRda', 'spotify:playlist:37i9dQZF1DX10zKzsJ2jva', 'spotify:playlist:37i9dQZF1DX4JAvHpjipBk', 'spotify:playlist:37i9dQZF1DX4sWSpwq3LiO', 'spotify:playlist:37i9dQZF1DX4SBhb3fqCJd', 'spotify:playlist:37i9dQZF1DWXRqgorJj26U', 'spotify:playlist:37i9dQZF1DX4dyzvuaRJ0n', 'spotify:playlist:37i9dQZF1DXcF6B6QPhFDv', 'spotify:playlist:37i9dQZF1DWXJfnUiYjUKT']}
ID = []
prefix = 'spotify:playlist:'
for x in spotify_data['uri']:
    if prefix in x:
        playlist_id = x.replace(prefix, '')
        ID.append(playlist_id)
print(ID)

方法2：字符串切片（性能最优） #

因为前缀的长度是固定的，直接截取前缀之后的部分，速度更快：

spotify_data = {'uri':['spotify:playlist:37i9dQZF1DXcBWIGoYBM5M', 'spotify:playlist:37i9dQZF1DX0XUsuxWHRQd', 'spotify:playlist:37i9dQZF1DX1lVhptIYRda', 'spotify:playlist:37i9dQZF1DX10zKzsJ2jva', 'spotify:playlist:37i9dQZF1DX4JAvHpjipBk', 'spotify:playlist:37i9dQZF1DX4sWSpwq3LiO', 'spotify:playlist:37i9dQZF1DX4SBhb3fqCJd', 'spotify:playlist:37i9dQZF1DWXRqgorJj26U', 'spotify:playlist:37i9dQZF1DX4dyzvuaRJ0n', 'spotify:playlist:37i9dQZF1DXcF6B6QPhFDv', 'spotify:playlist:37i9dQZF1DWXJfnUiYjUKT']}
ID = []
prefix = 'spotify:playlist:'
prefix_length = len(prefix)
for x in spotify_data['uri']:
    # 用startswith判断比in更严谨，确保前缀是在开头
    if x.startswith(prefix):
        playlist_id = x[prefix_length:]
        ID.append(playlist_id)
print(ID)

方法3：指定分隔符的split（如果你非要用split的话） #

如果坚持想用split，得指定用spotify:playlist:作为分隔符，然后取分割后的第二个元素：

spotify_data = {'uri':['spotify:playlist:37i9dQZF1DXcBWIGoYBM5M', 'spotify:playlist:37i9dQZF1DX0XUsuxWHRQd', 'spotify:playlist:37i9dQZF1DX1lVhptIYRda', 'spotify:playlist:37i9dQZF1DX10zKzsJ2jva', 'spotify:playlist:37i9dQZF1DX4JAvHpjipBk', 'spotify:playlist:37i9dQZF1DX4sWSpwq3LiO', 'spotify:playlist:37i9dQZF1DX4SBhb3fqCJd', 'spotify:playlist:37i9dQZF1DWXRqgorJj26U', 'spotify:playlist:37i9dQZF1DX4dyzvuaRJ0n', 'spotify:playlist:37i9dQZF1DXcF6B6QPhFDv', 'spotify:playlist:37i9dQZF1DWXJfnUiYjUKT']}
ID = []
for x in spotify_data['uri']:
    if 'spotify:playlist:' in x:
        # 指定分隔符分割后，得到['', '播放列表ID']
        parts = x.split('spotify:playlist:')
        playlist_id = parts[1]
        ID.append(playlist_id)
print(ID)

这三种方法都能得到你想要的结果：['37i9dQZF1DXcBWIGoYBM5M', '37i9dQZF1DX0XUsuxWHRQd', ...]

内容的提问来源于stack exchange，提问作者Stackbeans