我的代码需要一些帮助。我正在使用for循环创建一个变量，以便我获取元素列表。
当我尝试这个时：
Size我会得到这样的长元素列表：
channels = map(str, channels)
channels = str(channels)
channel = [channels for channel in channels]
print channel
以下是我使用13:54:18 T:4308 NOTICE: ["['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']", "['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']"]
print channels以下是完整代码：
14:01:19 T:1616 NOTICE: ['101 BBC One S East ', '102 BBC Two ', '103 ITV ', '104 Channel 4 ', '105 Channel 5 ', '106 Sky One ', '107 Sky Living ']
我想在变量里面使用for循环的变量。
请告诉我如何在列表中打印每个元素而不重复在变量中创建for循环？
答案 0 :(得分：2)
此代码完全错误：
channels = map(str, channels)
channels = str(channels)
channel = [channels for channel in channels]
print channel
除此之外，要打印每个频道，您可以这样做：
for channel in channels:
print channel
变量“中没有”for循环。你拥有的是一个有价值的变量。该值可以是任何类型的对象，例如字符串或列表。
让我们逐行完成你的代码......
第一行将channels的每个成员转换为字符串：
channels = map(str, channels)
例如，如果列表中有整数（[1, 2, 3]），则会将它们转换为字符串（['1', '2', '3']）。
下一行将整个channels对象转换为一个字符串：
channels = str(channels)
因此， 1,2,3 示例现在变为"['1', '2', '3']"。
下一行是列表理解。它遍历channels（for channel in channels）的所有元素，并为每个元素添加channels到列表中。然后，它将所有内容存储到名为channel的变量中：
channel = [channels for channel in channels]
我不知道目的是什么。无论如何，最终结果与您使用以下代码得到的结果相当：
channel = []
for character in channels:
# Goes through all 15 characters of "['1', '2', '3']"
# Ignores the character, appends the whole `characters` string to the list
channel.append(channels)
请注意，在上一行channels被转换为字符串，因此迭代channels实际上会遍历字符。
因此，在该行之后，对于 1,2,3 输入，channel将是"['1', '2', '3']"字符串的15倍。
如果您不知道代码行是什么，请尝试打印结果。这很简单有效。例如：
print channels
channels = map(str, channels)
print channels
channels = str(channels)
print channels
channel = [channels for channel in channels]
print channel
然后看看你得到的是你想要的每条线。