python 3.5 : Is there a way to make this list more organized?

Question

假设您有以下代码:

bicycles = ['Trek','Cannondale','Redline','Secialized']
print(bicycles[0],bicycles[1],bicycles[2],bicycles[3])

这将打印出:

Trek Cannondale Redline Specialized

我有两个问题。 首先，有没有一种方法可以使打印字符串更有条理，这样您就不必多次输入自行车？我知道如果您只是这样做:

print(bicycles)

它还会打印括号，这是我试图避免的。

第二个问题，打印时如何插入逗号以在列表中显示？

这就是我想要的结果:

Trek, Cannondale, Redline, Specialized.

我知道我可以做到

print("Trek, Cannondale, Redline, Specialized.")

但是使用列表是否可以使它更有条理？或者将句子打印出来是最明智的做法吗？

Answer 1

use .join() method:

The method join() returns a string in which the string elements of sequence have been joined by str separator.

syntax: str.join(sequence)

bicycles = ['Trek','Cannondale','Redline','Secialized']
print (' '.join(bicycles))

输出:

Trek Cannondale Redline Secialized

示例:将分隔符更改为 ', ':

print (', '.join(bicycles))

输出:

Trek, Cannondale, Redline, Secialized

For python 3. you can also use unpacking:

We can use * to unpack the list so that all elements of it can be passed as different parameters.

We use operator *

bicycles = ['Trek','Cannondale','Redline','Secialized']
print (*bicycles)

输出:

Trek Cannondale Redline Secialized

注意:它使用 ' ' 作为默认分隔符，或者指定一个分隔符，例如:

print(*bicycles, sep=', ')

输出:

Trek, Cannondale, Redline, Secialized

如果列表中的元素是不同类型(无需显式转换为字符串)，它也可以工作

例如，如果自行车是 ['test', 1, 'two', 3.5, 'something else']

bicycles = ['test', 1, 'two', 3.5, 'something else']
print(*bicycles, sep=', ')

输出:

test, 1, two, 3.5, something else